/[pub]/test/html-webhacc/error-description-source.xml
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revision 1.1 by wakaba, Sun Jul 1 10:02:24 2007 UTC revision 1.38 by wakaba, Fri Aug 29 13:35:14 2008 UTC
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3      xmlns:d="http://suika.fam.cx/~wakaba/archive/2007/wdcc-desc/"      xmlns:d="http://suika.fam.cx/~wakaba/archive/2007/wdcc-desc/"
4      id="error-description">      id="error-description">
5  <head>  <head>
6  <title xml:lang="en">Description of Errors &#x2014;  <base href="cc/"/>
7  Web Document Conformance Checker (BETA)</title>  <title xml:lang="en">Description of Errors &#x2014; WebHACC (β)</title>
8  <link rel="stylesheet" href="cc-style"/>  <title xml:lang="ja">誤りの説明 &#x2014; WebHACC (β)</title>
9    <link rel="stylesheet" href="../cc-style"/>
10  <link rel="license" href="#license"/>  <link rel="license" href="#license"/>
11  </head>  </head>
12  <body>  <body>
13  <h1>Description of Errors</h1>  <header>
14    <h1><a href="../cc-about"><abbr title="Web Hypertext Application Conformance Checker (β)"><img src="../icons/title" alt="WebHACC"/></abbr></a></h1>
15    <h2>Description of Errors</h2>
16    </header>
17    
18    <d:cat name="WebHACC:Title">
19      <d:text xml:lang="en">WebHACC (β)</d:text>
20    </d:cat>
21    
22    <d:cat name="WebHACC:Heading">
23      <d:text xml:lang="en">
24        <a href="../error-description#WebHACC:Heading" rel="help"><abbr title="Web Hypertext Application Conformance Checker (β)"><img src="../icons/title" alt="WebHACC"/></abbr></a>
25      </d:text>
26      <d:text xml:lang="ja">
27        <a href="../error-description#WebHACC:Heading" rel="help"><abbr title="Web ハイパーテキスト応用適合性検査器 (β)"><img src="../icons/title" alt="WebHACC"/></abbr></a>
28      </d:text>
29      <d:desc xml:lang="en">
30        <p><a href="./#input"><abbr title="Web Hypertext Application Conformance Checker">WebHACC</abbr></a>
31        is a <em>conformance checker</em> (or validator) for Web documents,
32        supporting <a href="../standards">latest Web standards</a> including
33        <a href="http://whatwg.org/html5"><abbr title="Hypertext Markup Language">HTML</abbr>5</a>,
34        <a href="urn:ietf:rfc:4287">Atom 1.0</a>,
35        <a href="http://www.w3.org/Style/CSS/current-work"><abbr title="Cascading Style Sheets">CSS</abbr>3</a>.</p>
36    
37        <p><strong><a href="./#input">Check your document</a></strong>, or
38        <a href="../cc-about">learn more about
39        <abbr title="Web Hypertext Application Conformance Checker">WebHACC</abbr></a>.</p>
40      </d:desc>
41      <d:desc xml:lang="ja">
42        <p><a href="./#input"><abbr title="Web ハイパーテキスト応用適合性検査器">WebHACC</abbr></a>
43        は、 Web 文書のための<em>適合性検査器</em> (妥当性検証器) です。
44        <a href="http://whatwg.org/html5"><abbr title="Hypertext Markup Language">HTML</abbr>5</a>、
45        <a href="urn:ietf:rfc:4287">Atom 1.0</a>、
46        <a href="http://www.w3.org/Style/CSS/current-work"><abbr title="Cascading Style Sheets">CSS</abbr>3</a>
47        などの<a href="../standards">最新の Web 標準</a>に対応しています。</p>
48    
49  <section id="html5-parse-errors">      <p><strong><a href="./#input">文書を検査する</a></strong></p>
 <h2>HTML5 Parse Errors</h2>  
50    
51  <d:item name="after head"      <p><a href="../cc-about"><abbr title="Web ハイパーテキスト応用適合性検査器">WebHACC</abbr>
52        の詳細</a></p>
53      </d:desc>
54    </d:cat>
55    
56    <section id="character-encoding-layer">
57    <h2>Character Encoding Layer Errors</h2>
58    
59    <d:item name="illegal-octets-error" class="error-category-charset" level="m">
60      <d:message xml:lang="en">An illegal octet in the input stream.</d:message>
61    </d:item>
62    </section>
63    
64    <section id="html5-character-encoding">
65    <h2>HTML5 Character Encoding Errors</h2>
66    
67    <d:item name="disallowed character encoding"
68        modules="ContentChecker">
69      <d:message xml:lang="en">Character encoding <code><var>{text}</var></code>
70      is not allowed for <abbr>HTML</abbr> document.</d:message>
71      <d:desc xml:lang="en">
72        <p>The character encoding used for the document is not allowed
73        for <abbr>HTML</abbr> document.  The document is non‐conforming.</p>
74      </d:desc>
75    </d:item>
76    
77    <d:item name="bad character encoding"
78        modules="ContentChecker">
79      <d:message xml:lang="en">Character encoding <code><var>{text}</var></code>
80      should not be used for <abbr>HTML</abbr> document.</d:message>
81      <d:desc xml:lang="en">
82        <p>The character encoding used for the document is not recommended
83        for <abbr>HTML</abbr> document.  The document is non‐conforming
84        unless there is any good reason to use that encoding.</p>
85      </d:desc>
86    </d:item>
87    
88    <d:item name="non-utf-8 character encoding"
89        modules="ContentChecker">
90      <d:message xml:lang="en">Use of UTF-8 is encouraged (this document
91      is encoded in <code><var>{text}</var></code>).</d:message>
92      <d:desc xml:lang="en">
93        <p>Use of UTF-8 as the character encoding of the document is encouraged,
94        though the use of another character encoding is still conforming.</p>
95      </d:desc>
96    </d:item>
97    
98    <d:item name="character encoding unchecked"
99        modules="ContentChecker">
100      <d:message xml:lang="en">Conformance for character encoding requirements
101      cannot be checked, since the input is not a byte stream.</d:message>
102      <d:desc xml:lang="en">
103        <p>The conformance checker cannot detect whether the input document
104        met the requirements on character encoding, since the document
105        is not inputed as a serialized byte sequence.  The document is
106        not conforming if it is not encoded in an appropriate character
107        encoding with appropriate labeling.</p>
108      </d:desc>
109    </d:item>
110    
111    <d:item name="no character encoding declaration"
112        modules="ContentChecker">
113      <d:message xml:lang="en">There is no character encoding
114      declaration.</d:message>
115      <d:desc xml:lang="en">
116        <p>The document does not contain a character encoding
117        declaration.  Unless the character encoding is explicitly
118        specified in lower‐level protocol, e.g. in <abbr>HTTP</abbr>,
119        or is implied by <abbr>BOM</abbr>, there must be a character
120        encoding declaration.  The document is non‐conforming.</p>
121    
122        <p>The long character encoding declaration syntax
123        <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
124        is obsolete.  The new syntax is:</p>
125        <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
126    
127        <p>Note that the <code>encoding</code> declaration in <abbr>XML</abbr>
128        declaration has no effect for <abbr>HTML</abbr> document.</p>
129      </d:desc>
130    </d:item>
131    
132    <d:item name="non ascii superset"
133        modules="ContentChecker">
134      <d:message xml:lang="en">No character encoding metadata is found
135      in lower‐level protocol nor is there <abbr>BOM</abbr>, while
136      character encoding <code><var>{text}</var></code>
137      is not a superset of <abbr>ASCII</abbr>.</d:message>
138      <d:desc xml:lang="en">
139        <p>The document is not labeled with character encoding name
140        in lower‐level protocol, e.g. in <abbr>HTTP</abbr>, and
141        the document is not begin with <abbr>BOM</abbr>.  In addition,
142        the character encoding of the document is not a superset of
143        <abbr>ASCII</abbr>.  The document is non‐conforming.</p>
144    
145        <p>Unless there is a <abbr>BOM</abbr>, the character encoding
146        for the document must be specified in e.g. <abbr>HTTP</abbr>‐level,
147        as:</p>
148        <pre class="http example"><code>Content-Type: text/html; charset=<var>charset-name</var></code></pre>
149    
150        <p>Existence of <abbr>HTML</abbr> character encoding declaration, i.e.
151        <code class="html example">&lt;meta charset="<var>charset-name</var>"></code>,
152        does not allow to omit <code>charset</code> parameter
153        for <abbr>HTML</abbr> document encoded in non‐<abbr>ASCII</abbr>
154        compatible encoding.</p>
155    
156        <p>Character encodings <code>Shift_JIS</code>, <code>Windows-31J</code>,
157        and <code>ISO-2022-JP</code> are <em>not</em> a superset of
158        <abbr>ASCII</abbr> for the purpose of <abbr>HTML</abbr> conformance.</p>
159      </d:desc>
160    </d:item>
161    
162    <d:item name="sniffing:chardet"
163        modules="HTML::Parser">
164      <d:message xml:lang="en">Character encoding of this document is sniffed
165      as <code><var>{text}</var></code> (Sniffed because no explicit specification
166      for the character encoding of this document is found in the transfer
167      procotol headers).</d:message>
168    </d:item>
169    
170    <d:item name="sniffing:default"
171        modules="HTML::Parser">
172      <d:message xml:lang="en">Character encoding of this document is defaulted
173      to <code><var>{text}</var></code> because no explicit specification
174      for the character encoding of this document is found in the transfer
175      procotol headers.</d:message>
176    </d:item>
177    
178    <d:item name="chardecode:fallback"
179        modules="HTML::Parser">
180      <d:message xml:lang="en">Since no decoder for the document character
181      encoding is found, decoder for the character encoding
182      <code><var>{text}</var></code> is used.  Checking results might be
183      <em>wrong</em>.</d:message>
184    </d:item>
185    
186    <d:item name="chardecode:no error"
187        modules="HTML::Parser">
188      <d:message xml:lang="en">Conformance error checking for the character
189      encoding <code><var>{text}</var></code> is not supported.</d:message>
190    </d:item>
191    
192    <d:item name="charset label:matching"
193        modules="HTML::Parser">
194      <d:message xml:lang="en">Sniffed character encoding
195      <code><var>{text}</var></code> is same as the character encoding specified
196      in the character encoding declaration.  This is <em>not</em> an
197      error.</d:message>
198    </d:item>
199    
200    <d:item name="charset label detected"
201        class="format-charset warning"
202        modules="HTML::Parser">
203      <d:message xml:lang="en">While parsing the document as
204      <code><var>{text}</var></code>, a character encoding declaration specifying
205      a different character encoding is found.  The document
206      is reparsed.</d:message>
207      <d:desc xml:lang="en">
208        <p>While parsing a document in a character encoding,
209        a character encoding declaration which declares the character
210        encoding of the document as another character encoding is found.
211        The occurence of this warning itself does not make the document
212        non‐conforming.  However, the failure of the first attempt to
213        to detect the character encoding might be a result of non‐conformance
214        of the document.</p>
215    
216        <p>The document will be reparsed from the beginning.  Some error
217        or warning might be reported again.</p>
218    
219        <p>These are suggestions to avoid this warning:</p>
220        <ul>
221        <li>Specify <code>charset</code> parameter in the <code>Content-Type</code>
222        field in the <abbr>HTTP</abbr> header, as:
223        <pre class="HTTP example"><code>Content-Type: text/html; charset="<var>charset-name</var>"</code></pre></li>
224        <li>Put the character encoding declaration
225        (<code class="html example">&lt;meta charset="<var>charset-name</var>"></code>)
226        just after <code class="html example">&lt;head></code> start tag.</li>
227        <li>Use <code>UTF-8</code>.</li>
228        </ul>
229      </d:desc>
230    </d:item>
231    
232    <d:item name="NULL"
233        modules="HTML::Parser">
234      <d:message xml:lang="en">The <code class="charname">NULL</code> character
235      is not allowed.</d:message>
236    </d:item>
237    
238    <d:item name="control char"
239        modules="HTML::Parser">
240      <d:message xml:lang="en">Code point <code><var>{text}</var></code> is
241      not allowed.</d:message>
242    </d:item>
243    
244    </section>
245    
246    <section id="html5-tokenize-error">
247    <h2>HTML5 Parse Errors in Tokenization Stage</h2>
248    
249    <d:item name="after html"
250      class="parse-error">      class="parse-error">
251    <d:message xml:lang="en">The <code><var>$0</var></code> element cannot be    <d:message xml:lang="en">Tag <code>&lt;<var>$0</var>&gt;</code>
252    inserted between <code>head</code> and <code>body</code> elements.</d:message>    is not allowed after the end tag <code>&lt;/html></code>.</d:message>
253    <d:desc xml:lang="en">    <d:desc xml:lang="en">
254      <p>A start tag occurs after the <code>head</code> element is closed      <p>The start or end tag of an element appears after the
255      but before the <code>body</code> element is opened.      <code>html</code> element has been closed.  The document is
256        non-conforming.</p>
257    
258        <p>Any content of the document other than comments
259        must be put into the <code>html</code> element.</p>
260      </d:desc>
261    </d:item>
262    
263    <d:item name="after body"
264        class="parse-error">
265      <d:message xml:lang="en">Tag <code>&lt;<var>$0</var>&gt;</code>
266      is not allowed after the end tag <code>&lt;/body></code>.</d:message>
267      <d:desc xml:lang="en">
268        <p>The start or end tag of an element appears after the
269        <code>body</code> element has been closed.  The document is
270        non-conforming.</p>
271    
272        <p>Any content of the document other than <code>head</code>
273        contents and comments must be put into the <code>body</code>
274        element.</p>
275      </d:desc>
276    </d:item>
277    
278    <d:item name="bad attribute name"
279        class="tokenize-error"
280        modules="HTML::Parser">
281      <d:message xml:lang="en">Attribute name cannot contain characters
282      <code>"</code>, <code>'</code>, and <code>=</code>.</d:message>
283    </d:item>
284    
285    <d:item name="bad attribute value"
286        class="tokenize-error"
287        modules="HTML::Parser">
288      <d:message xml:lang="en">Attribute value must be quoted by <code>"</code>
289      or <code>'</code> if it contains a <code>"</code>, <code>'</code>, or
290      <code>=</code> character.</d:message>
291    </d:item>
292    
293    <d:item name="bare ero"
294        class="tokenize-error"
295        modules="HTML::Parser">
296      <d:message xml:lang="en">The <code>&amp;</code> character must
297      be escaped as <code class="html example">&amp;amp;</code>.</d:message>
298      <d:desc xml:lang="en">
299        <p>An <code>&amp;</code> character which
300        is not part of any reference appears in the input stream.
301        The document is non‐conforming.</p>
302    
303        <p><em>Any <code>&amp;</code> character in URI (or IRI)
304        must be escaped as <code class="example">&amp;amp;</code>.</em></p>
305    
306        <p>The <code>&amp;</code> character must
307        be the first character of a reference:
308          <dl class="switch">
309          <dt>Named entity reference</dt>
310              <dd><pre class="html example"><code>&amp;<var>entity-name</var>;</code></pre>
311              where <var>entity-name</var> is the name of the
312              character entity to be referenced.</dd>
313          <dt>Numeric character reference</dt>
314              <dd><pre class="html example"><code>&amp;#<var>d</var>;</code></pre>
315              where <var>d</var> is the decimal representation of
316              the code position of the character to be referenced.</dd>
317          <dt>Hexadecimal character reference</dt>
318              <dd><pre class="html example"><code>&amp;#x<var>h</var>;</code></pre>
319              where <var>h</var> is the hexadecimal representation
320              of the code position of the character to be referenced.</dd>
321          </dl>
322        </p>
323    
324        <p>To represent <code>&amp;</code> as a data character, use
325        named entity reference:
326          <pre class="html example"><code>&amp;amp;</code></pre>
327        </p>
328      </d:desc>
329    </d:item>
330    
331    <d:item name="bare etago"
332        class="tokenize-error"
333        modules="HTML::Parser">
334      <d:message xml:lang="en">A <code>&lt;/</code> string is not followed
335      by a tag name.</d:message><!-- </ EOF -->
336      <d:desc xml:lang="en">
337        <p>There is a <code>&lt;</code> (<code>U+003C</code>
338        <code class="charname">LESS-THAN SIGN</code>) character
339        immediately followed by a <code>/</code> (<code>U+005F</code>
340        <code>SOLIDUS</code>) character, which is not part
341        of any end tag, in the input stream.  The document
342        is non-conforming.</p>
343    
344        <p>The <code>&lt;/</code> sequence immediately followed
345        by an <abbr title="End of file pseudo-character">EOF</abbr> is
346        interpreted as a string data of <code>&lt;/</code>.</p>
347    
348        <p>The <code>&lt;/</code> sequence as string data must
349        be escaped as:
350        <pre class="html example"><code>&amp;lt;/</code></pre>
351        </p>
352      </d:desc>
353    </d:item>
354    
355    <d:item name="bare stago"
356        class="tokenize-error"
357        modules="HTML::Parser">
358      <d:message xml:lang="en">A <code>&lt;</code> character is not followed
359      by tag name or by a <code>!</code> character.</d:message>
360      <d:desc xml:lang="en">
361        <p>A <code>&lt;</code> (<code>U+003C</code>
362        <code class="charname">LESS-THAN SIGN</code>) character which is not part
363        of any markup appears in the input stream.</p>
364    
365        <p>The <code>&lt;</code> character as a data character must
366        be escaped as:
367        <pre class="html example"><code>&amp;lt;</code></pre>
368        </p>
369      </d:desc>
370    </d:item>
371    
372    <d:item name="bare nero"
373        class="tokenize-error"
374        modules="HTML::Parser">
375      <d:message xml:lang="en">The decimal representation of the code position
376      of a character must be specified after <code>&amp;#</code>.</d:message>
377      <d:desc xml:lang="en">
378        <p>An <code>&amp;</code> (<code>U+0026</code>
379        <code class="charname">AMPERSAND</code>) character immediately
380        followed by a <code>#</code> (<code>U+0023</code>
381        <code>NUMBER SIGN</code>) character which
382        is not part of any reference appears in the input stream.
383      The document is non-conforming.</p>      The document is non-conforming.</p>
384    
385        <p>The string <code>&amp;#</code> must be the first two characters
386        of a reference:
387          <dl class="switch">
388          <dt>Numeric character reference</dt>
389              <dd><pre class="html example"><code>&amp;#<var>d</var>;</code></pre>
390              where <var>d</var> is the decimal representation of
391              the code point of the character to be referenced.</dd>
392          <dt>Hexadecimal character reference</dt>
393              <dd><pre class="html example"><code>&amp;#x<var>h</var>;</code></pre>
394              where <var>h</var> is the hexadecimal representation
395              of the code point of the character to be referenced.</dd>
396          </dl>
397        </p>
398    
399        <p>To represent <code>&amp;#</code> as data characters, use
400        a named entity reference for the <code>&amp;</code> character:
401          <pre class="html example"><code>&amp;amp;#</code></pre>
402        </p>
403      </d:desc>
404    </d:item>
405    
406    <d:item name="bare hcro"
407        class="tokenize-error"
408        modules="HTML::Parser">
409      <d:message xml:lang="en">The hexadecimal representation of the code position
410      of a character must be specified after <code>&amp;#x</code>.</d:message>
411      <d:desc xml:lang="en">
412       <p>The string <code>&amp;#x</code> or <code>&amp;#X</code> which
413       is not part of any reference appears in the input stream.
414        The document is non-conforming.</p>
415    
416        <p>The string <code>&amp;#x</code> or <code>&amp;#X</code> must
417        be the first three characters of a hexadecimal reference:
418          <pre class="html example"><code>&amp;#x<var>h</var>;</code></pre>
419        where <var>h</var> is the hexadecimal representation
420        of the code point of the character to be referenced.</p>
421    
422        <p>To represent <code>&amp;#x</code> as data characters, use
423        a named entity reference for the <code>&amp;</code> character:
424          <pre class="html example"><code>&amp;amp;#x</code></pre>
425        </p>
426      </d:desc>
427    </d:item>
428    
429    <d:item name="bogus comment"
430        class="tokenize-error"
431        modules="HTML::Parser">
432      <d:message xml:lang="en">String <code>&lt;!</code> is not followed
433      by <code>--</code>.</d:message>
434      <d:desc xml:lang="en">
435        <p>There is a <code>&lt;</code> (<code>U+003C</code>
436        <code class="charname">LESS-THAN SIGN</code>) character
437        followed by a <code>!</code> (<code>U+0021</code>
438        <code class="charname">EXCLAMATION MARK</code>) character,
439        which is not followed by a <code>--</code> or
440        <code>!DOCTYPE</code>.  The document is non-conforming.</p>
441    
442        <dl class="switch">
443        <dt>Comments</dt>
444          <dd>In HTML document, comments must be introduced by
445          <code class="example">&lt;!--</code> (<code>&lt;!</code>
446          <em>immediately</em> followed
447          by <em>two</em> <code>-</code>s) and must be terminated by
448          <code class="example">--></code>.
449          Strings <code>&lt;!</code> not followed
450          by <code>--</code> and <code>&lt;!-</code> not followed by
451          <code>-</code> are not valid open delimiters for comments.</dd>
452        <dt>Marked sections, including <code>CDATA</code> sections</dt>
453          <dd>Marked sections are not allowed in HTML document.</dd>
454        <dt>Markup declarations</dt>
455          <dd>Markup declarations, except for <code>DOCTYPE</code>
456          and comment declarations, are not allowed in HTML document.</dd>
457        <dt>String <code>&lt;!</code></dt>
458          <dd>String <code>&lt;!</code> must be escaped as
459          <code class="example">&amp;lt;!</code>.</dd>
460        </dl>
461      </d:desc>
462    </d:item>
463    
464    <d:item name="bogus end tag"
465        class="tokenize-error"
466        modules="HTML::Parser">
467      <d:message xml:lang="en">String <code>&lt;/</code> is not followed
468      by tag name.</d:message><!-- </ non-name-start-char-non-EOF -->
469      <d:desc xml:lang="en">
470        <p>There is a <code>&lt;</code> (<code>U+003C</code>
471        <code class="charname">LESS-THAN SIGN</code>) character
472        immediately followed by a <code>/</code> (<code>U+005F</code>
473        <code>SOLIDUS</code>) character, which is not part
474        of any end tag, in the input stream.  The document
475        is non-conforming.</p>
476    
477        <p>The <code>&lt;/</code> sequence not followed by a
478        tag name is parsed as an opening of bogus comment.</p>
479    
480        <p>The <code>&lt;/</code> sequence as string data must
481        be escaped as:
482        <pre class="html example"><code>&amp;lt;/</code></pre>
483        </p>
484      </d:desc>
485    </d:item>
486    
487    <d:item name="C1 character reference"
488        class="tokenize-error"
489        modules="HTML::Parser">
490      <d:message xml:lang="en">Character reference to
491      <code><var>{text}</var></code> is not allowed.</d:message>
492    </d:item>
493    
494    <d:item name="CR character reference"
495        class="tokenize-error"
496        modules="HTML::Parser">
497      <d:message xml:lang="en">Character reference to
498      <code>U+000D</code> (<code class="charname">CARRIAGE RETURN</code>)
499      is not allowed.</d:message>
500    </d:item>
501    
502    <d:item name="dash in comment"
503        class="tokenize-error"
504        modules="HTML::Parser">
505      <d:message xml:lang="en">There is a <code>--</code> sequence
506      in a comment.</d:message>
507      <d:desc xml:lang="en">
508        <p>There is a <code>-</code> (<code>U+002D</code>
509        <code class="charname">HYPHEN-MINUS</code>) character
510        at the end of the comment or a <code>--</code> sequence
511        in the comment.  The document is non-conforming.</p>
512    
513        <p>Comments cannot contain a string <code>--</code>, as in XML.
514        Unlike SGML, there cannot be more than one comments
515        (where <i>comment</i> is an SGML term) in the comment
516        declaration.</p>
517    </d:desc>    </d:desc>
518  </d:item>  </d:item>
519    
520  <d:item name="duplicate attribute"  <d:item name="duplicate attribute"
521      class="tokenize-error">      class="tokenize-error"
522    <d:message xml:lang="en">There are two attributes with same name.</d:message>      modules="HTML::Parser">
523      <d:message xml:lang="en">There are two attributes with name
524          <code><var>{text}</var></code>.</d:message>
525    <d:desc xml:lang="en">    <d:desc xml:lang="en">
526      <p>Attributes must be unique in an element.  Specifying      <p>There are more than one attributes with the same
527      attributes with same name more than once is non-conforming.</p>      name in a tag.  The document is non-conforming.</p>
528    
529      <p>The <code>motion</code> attribute is not part of the HTML standard.      <p>The <code>motion</code> attribute is not part of the HTML standard.
530      Use <code>img</code> element with animation GIF instead.</p>      Use <code>img</code> element with animation GIF instead.</p>
531    </d:desc>    </d:desc>
532  </d:item>  </d:item>
533    
534    <d:item name="empty start tag"
535        class="tokenize-error"
536        modules="HTML::Parser">
537      <d:message xml:lang="en">Empty start tag (<code>&lt;></code>) is not
538      allowed.</d:message>
539    </d:item>
540    
541    <d:item name="empty end tag"
542        class="tokenize-error"
543        modules="HTML::Parser">
544      <d:message xml:lang="en">Empty end tag (<code>&lt;/></code>) is not
545      allowed.</d:message>
546    </d:item>
547    
548    <d:item name="end tag attribute"
549        class="tokenize-error"
550        modules="HTML::Parser">
551      <d:message xml:lang="en">End tag cannot have attributes.</d:message>
552    </d:item>
553    
554    <d:item name="invalid character reference"
555        class="tokenize-error"
556        modules="HTML::Parser">
557      <d:message xml:lang="en">Character reference to
558      <code><var>{text}</var></code> is not allowed.</d:message>
559    </d:item>
560    
561  <d:item name="nestc"  <d:item name="nestc"
562      class="tokenize-error">      class="tokenize-error"
563    <d:message xml:lang="en">Void element syntax (<code>/></code>) cannot be      modules="HTML::Parser">
564      <d:message xml:lang="en">Polytheistic slash (<code>/></code>) cannot be
565    used for this element.</d:message>    used for this element.</d:message>
566    <d:desc xml:lang="en">    <d:desc xml:lang="en">
567      <p>The void element syntax <code>/></code> syntax can only be      <p>Polytheistic slash (<code>/></code>) must not be used
568        for the element.  The document is non-conforming.</p>
569    
570        <p>The polytheistic slash can only be
571      used for <code>base</code>, <code>link</code>, <code>meta</code>,      used for <code>base</code>, <code>link</code>, <code>meta</code>,
572      <code>hr</code>, <code>br</code>, <code>img</code>,      <code>hr</code>, <code>br</code>, <code>img</code>,
573      <code>embed</code>, <code>param</code>, <code>area</code>,      <code>embed</code>, <code>param</code>, <code>area</code>,
574      <code>col</code>, and <code>input</code> elements.      <code>col</code>, and <code>input</code> elements.</p>
575      For any other elements, using that syntax is non-conforming.</p>  
576        <dl class="switch">
577        <dt><code>&lt;script/></code></dt>
578            <dd><p>The polytheistic slash cannot be used for <code>script</code>
579            element.  Even for an empty <code>script</code> element,
580            there must be an explicit end tag
581            <code class="html example">&lt;/script></code>.</p>
582    
583            <p><strong>NOTE</strong>: Though some user agents interpret
584            polytheistic slash for <code>script</code> element as the
585            closing of the element, such usage is not allowed under
586            the current standard.</p></dd>
587        <dt><code>&lt;basefont/></code>, <code>&lt;bgsound/></code>,
588        <code>&lt;frame/></code>, <code>&lt;keygen/></code>,
589        <code>&lt;spacer/></code>, <code>&lt;wbr/></code></dt>
590            <dd>These elements are themselves non-conforming.</dd>
591        <!-- isindex, image -->
592        <dt><code>&lt;command/></code>, <code>&lt;event-source/></code>,
593        <code>&lt;nest/></code>, or <code>&lt;source/></code></dt>
594            <dd>Future revision of HTML5 parsing algorithm is expected
595            to allow polytheistic slash for these elements.</dd>
596        <dt><code>&lt;a/></code>, <code>&lt;p/></code></dt>
597            <dd>These elements are not always empty and therefore
598            polytheistic slash is not allowed.  Use explicit end tag
599            to represent empty element as:
600              <pre class="example html"><code>&lt;p>&lt;/p></code></pre>
601            </dd>
602        </dl>
603    
604      <p>Unlike XML, the void element syntax (<code>/></code>) has      <p>Note that, unlike in XML, the polytheistic slash has
605      no effect in HTML.</p>      no effect in HTML.</p>
606    </d:desc>    </d:desc>
607  </d:item>  </d:item>
608    
609    <d:item name="no DOCTYPE name"
610        class="tokenize-error"
611        modules="HTML::Parser">
612      <d:message xml:lang="en">After the string <code>&lt;!DOCTYPE </code>, the
613      document type name must be specified.</d:message>
614    </d:item>
615    
616    <d:item name="no PUBLIC literal"
617        class="tokenize-error"
618        modules="HTML::Parser">
619      <d:message xml:lang="en">After the keyword <code>PUBLIC</code>, no
620      oublic identifier is specified.</d:message>
621    </d:item>
622    
623    <d:item name="no refc"
624        class="tokenize-error"
625        modules="HTML::Parser">
626      <d:message xml:lang="en">Character reference must be closed by a
627      <code>;</code> character.</d:message>
628    </d:item>
629    
630    <d:item name="no space before DOCTYPE name"
631        class="tokenize-error"
632        modules="HTML::Parser">
633      <d:message xml:lang="en">After the string <code>&lt;!DOCTYPE</code>, there
634      must be at least a white space character before the document type
635      name.</d:message>
636    </d:item>
637    
638    <d:item name="no space between attributes"
639        class="tokenize-error"
640        modules="HTML::Parser">
641      <d:message xml:lang="en">Attributes must be separeted by at least a
642      white space character.</d:message>
643    </d:item>
644    
645    <d:item name="no SYSTEM literal"
646        class="tokenize-error"
647        modules="HTML::Parser">
648      <d:message xml:lang="en">After the keyword <code>SYSTEM</code>, no
649      system identifier is specified.</d:message>
650    </d:item>
651    
652    <d:item name="pio"
653        class="tokenize-error"
654        modules="HTML::Parser">
655      <d:message xml:lang="en">Processing instruction
656      (<code>&lt;?<var>...</var>></code>) is not allowed in HTML
657      document.</d:message>
658      <d:desc xml:lang="en">
659        <p>Processing instructions (<code>&lt;?<var>...</var>?></code>),
660        including XML declaration (<code>&lt;?xml <var>...</var>?></code>)
661        and XML style sheet <abbr title="processing instruction">PI</abbr>
662        (<code>&lt;?xml-stylesheet <var>...</var>?></code>), are not allowed
663        in the HTML syntax.  The document is non-conforming.</p>
664    
665        <dl class="switch">
666        <dt><code>&lt;?xbl?></code> (<abbr>XBL</abbr> Association)</dt>
667          <dd>An <abbr>XBL</abbr> binding cannot be associated by
668          <abbr title="processing instruction">PI</abbr> in <abbr>HTML</abbr>
669          document.  Use <code>binding</code> property in <abbr>CSS</abbr>
670          style sheet as:
671            <pre class="html example"><code>&lt;style>
672    p {
673      binding: url(binding.xbl);
674    }
675    &lt;/style></code></pre>
676          </dd>
677        <dt><code>&lt;?xml?&gt;</code> (XML declaration)</dt>
678            <dd>XML declaration is unnecessary for HTML documents.</dd>
679        <dt><code>&lt;?xml-stylesheet?></code> (XML style sheet
680        <abbr title="processing instruction">PI</abbr>)</dt>
681            <dd>Use HTML <code>link</code> element with <code>rel</code>
682            attribute set to <code>stylesheet</code> (or,
683            <code>alternate stylesheet</code> for an alternate style
684            sheet).
685              <pre class="example html"><code>&lt;link rel=stylesheet href="path/to/stylesheet.css"></code></pre>
686            </dd>
687        <dt><code>&lt;?php?&gt;</code> or
688        <code>&lt;? <var>... <abbr>PHP</abbr> code ...</var> ?&gt;</code>
689        (<abbr>PHP</abbr> code)</dt>
690            <dd>The conformance checker does <em>not</em> support
691            checking for PHP source documents.</dd>
692        <dt>Other processing instructions</dt>
693            <dd>Processing instructions cannot be inserted in an HTML
694            document.  Use XML document or insert
695            <code>ProcessingInstruction</code> node by scripting.</dd>
696        </dl>
697    
698        <p>Web browsers will parse processing instructions as bogus
699        comments.  Some legacy Web browsers, such as IE:mac and
700        some mobile Web browsers, will display processing instructions
701        as string.</p>
702      </d:desc>
703    </d:item>
704    
705    <d:item name="string after DOCTYPE name"
706        class="tokenize-error"
707        modules="HTML::Parser">
708      <d:message xml:lang="en">There is a bogus string after the document type
709      name.</d:message>
710    </d:item>
711    
712    <d:item name="string after PUBLIC"
713        class="tokenize-error"
714        modules="HTML::Parser">
715      <d:message xml:lang="en">There is a bogus string after the keyword
716      <code>PUBLIC</code>.</d:message>
717    </d:item>
718    
719    <d:item name="string after PUBLIC literal"
720        class="tokenize-error"
721        modules="HTML::Parser">
722      <d:message xml:lang="en">There is a bogus string after the public
723      identifier.</d:message>
724    </d:item>
725    
726    <d:item name="string after SYSTEM"
727        class="tokenize-error"
728        modules="HTML::Parser">
729      <d:message xml:lang="en">There is a bogus string after the keyword
730      <code>SYSTEM</code>.</d:message>
731    </d:item>
732    
733    <d:item name="string after SYSTEM literal"
734        class="tokenize-error"
735        modules="HTML::Parser">
736      <d:message xml:lang="en">There is a bogus string after the system
737      identifier.</d:message>
738    </d:item>
739    
740    <d:item name="unclosed attribute value"
741        class="tokenize-error"
742        modules="HTML::Parser">
743      <d:message xml:lang="en">Attribute value is not closed by a quotation
744      mark.</d:message>
745    </d:item>
746    
747    <d:item name="unclosed comment"
748        class="tokenize-error"
749        modules="HTML::Parser">
750      <d:message xml:lang="en">Comment is not closed by a string
751      <code>--></code>.</d:message>
752    </d:item>
753    
754    <d:item name="unclosed DOCTYPE"
755        class="tokenize-error"
756        modules="HTML::Parser">
757      <d:message xml:lang="en">The <code>DOCTYPE</code> is not closed by a
758      <code>></code> character.</d:message>
759    </d:item>
760    
761    <d:item name="unclosed PUBLIC literal"
762        class="tokenize-error"
763        modules="HTML::Parser">
764      <d:message xml:lang="en">The public identifier literal is not closed by a
765      quotation mark.</d:message>
766    </d:item>
767    
768    <d:item name="unclosed SYSTEM literal"
769        class="tokenize-error"
770        modules="HTML::Parser">
771      <d:message xml:lang="en">The system identifier literal is not closed by a
772      quotation mark.</d:message>
773    </d:item>
774    
775    <d:item name="unclosed tag"
776        class="tokenize-error"
777        modules="HTML::Parser">
778      <d:message xml:lang="en">Tag is not closed by a <code>></code>
779      character.</d:message>
780    </d:item>
781    
782    </section>
783    
784    <section id="html5-parse-errors">
785    <h2>HTML5 Parse Errors in Tree Construction Stage</h2>
786    
787    <d:item name="after body"
788        class="parse-error"
789        modules="HTML::Parser">
790      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>></code> is
791      not allowed after the <code>body</code> is closed.</d:message>
792    </d:item>
793    
794    <d:item name="after body:/"
795        class="parse-error"
796        modules="HTML::Parser">
797      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>></code> is
798      not allowed after the <code>body</code> is closed.</d:message>
799    </d:item>
800    
801    <d:item name="after body:#text"
802        class="parse-error"
803        modules="HTML::Parser">
804      <d:message xml:lang="en">Non‐white‐space characters are not allowed
805      after the <code>body</code> is closed.</d:message>
806    </d:item>
807    
808    <d:item name="after frameset"
809        class="parse-error"
810        modules="HTML::Parser">
811      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>></code> is
812      not allowed after the <code>frameset</code> is closed.</d:message>
813    </d:item>
814    
815    <d:item name="after frameset:/"
816        class="parse-error"
817        modules="HTML::Parser">
818      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>></code> is
819      not allowed after the <code>frameset</code> is closed.</d:message>
820    </d:item>
821    
822    <d:item name="after frameset:#text"
823        class="parse-error"
824        modules="HTML::Parser">
825      <d:message xml:lang="en">Non‐white‐space characters are not allowed
826      after the <code>frame</code> is closed.</d:message>
827    </d:item>
828    
829    <d:item name="after head"
830        class="parse-error">
831      <d:message xml:lang="en">The <code><var>{text}</var></code> element cannot be
832      inserted between <code>head</code> and <code>body</code>
833      elements.</d:message>
834      <d:desc xml:lang="en">
835        <p>A start tag appears after the <code>head</code> element is closed
836        but before the <code>body</code> element is opened.
837        The document is non-conforming.</p>
838      </d:desc>
839    </d:item>
840    
841    <d:item name="after html"
842        class="parse-error"
843        modules="HTML::Parser">
844      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>></code> is
845      not allowed after the <code>html</code> is closed.</d:message>
846    </d:item>
847    
848    <d:item name="after html:/"
849        class="parse-error"
850        modules="HTML::Parser">
851      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>></code> is
852      not allowed after the <code>html</code> is closed.</d:message>
853    </d:item>
854    
855    <d:item name="after html:#text"
856        class="parse-error"
857        modules="HTML::Parser">
858      <d:message xml:lang="en">Non‐white‐space characters are not allowed
859      after the <code>html</code> is closed.</d:message>
860    </d:item>
861    
862    <d:item name="image"
863        class="parse-error"
864        modules="HTML::Parser">
865      <d:message xml:lang="en">The <code>image</code> element is
866      obsolete.</d:message>
867    </d:item>
868    
869    <d:item name="in a:a"
870        class="parse-error"
871        modules="HTML::Parser">
872      <d:message xml:lang="en">Anchor cannot be nested.</d:message>
873      <d:desc xml:lang="en">
874        <p>HTML <code>a</code> elements cannot be nested.
875        The document is non-conforming.</p>
876    
877        <p>In the HTML syntax, a start tag of the <code>a</code>
878        implies the end tag of any opening <code>a</code> element.</p>
879      </d:desc>
880    </d:item>
881    
882    <d:item name="in body"
883        class="parse-error"
884        modules="HTML::Parser">
885      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>&gt;</code>
886      is not allowed in the <code>body</code> element.</d:message>
887      <d:desc xml:lang="en">
888        <p>The start or end tag of an element, which
889        cannot be a descendant of <code>body</code> element, appears
890        in the input stream while the <code>body</code> element has been opened.
891        The document is non-conforming.</p>
892      </d:desc>
893    </d:item>
894    
895    <d:item name="in body:#eof"
896        class="parse-error"
897        modules="HTML::Parser">
898      <d:message xml:lang="en">Some element is not closed before the end of
899      file.</d:message>
900    </d:item>
901    
902    <d:item name="in button:button"
903        class="parse-error"
904        modules="HTML::Parser">
905      <d:message xml:lang="en">The <code>button</code> element cannot be
906      nested.</d:message>
907    </d:item>
908    
909    <d:item name="in CDATA:#eof"
910        class="parse-error"
911        modules="HTML::Parser">
912      <d:message xml:lang="en">Element is not closed before the end of
913      file.</d:message>
914    </d:item>
915    
916    <d:item name="in form:form"
917        class="parse-error"
918        modules="HTML::Parser">
919      <d:message xml:lang="en">Start tag <code>&lt;form></code> is
920      not allowed in a <code>form</code> element.</d:message>
921    </d:item>
922    
923    <d:item name="in frameset"
924        class="parse-error"
925        modules="HTML::Parser">
926      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>></code> is
927      not allowed in a <code>framset</code> element.</d:message>
928    </d:item>
929    
930    <d:item name="in frameset:/"
931        class="parse-error"
932        modules="HTML::Parser">
933      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>></code> is
934      not allowed in a <code>frameset</code> element.</d:message>
935    </d:item>
936    
937    <d:item name="in frameset:#text"
938        class="parse-error"
939        modules="HTML::Parser">
940      <d:message xml:lang="en">Non‐white‐space characters are not allowed
941      in a <code>frameset</code> element.</d:message>
942    </d:item>
943    
944    <d:item name="in head:head"
945        class="parse-error"
946        modules="HTML::Parser">
947      <d:message xml:lang="en">Start tag <code>&lt;head&gt;</code>
948      is not allowed in the <code>head</code> element.</d:message>
949      <d:desc xml:lang="en">
950        <p>There is a start tag <code>&lt;head></code> in the
951        <code>&lt;head></code> element.  The document is non-conforming.</p>
952    
953        <p>In an HTML document there must not be more than
954        one <code>head</code> element, therefore no more than one
955        start tag <code>&lt;head></code> can appear in the input stream.</p>
956      </d:desc>
957    </d:item>
958    
959    <d:item name="in html:#DOCTYPE"
960        class="parse-error"
961        modules="HTML::Parser">
962      <d:message xml:lang="en">A <code>DOCTYPE</code> appears after any
963      element or data character has been seen.</d:message>
964      <!-- <!DOCTYPE HTML><!DOCTYPE HTML> -->
965      <!-- <html><!DOCTYPE HTML> -->
966      <d:desc xml:lang="en">
967        <p>A <code>DOCTYPE</code> appears after any element or data character
968        has been seen.  The document is non-conforming.</p>
969        
970        <p>The <code>DOCTYPE</code> must be placed before any
971        tag, reference, or data character.  Only white space characters
972        and comments can be inserted before the <code>DOCTYPE</code>.</p>
973      </d:desc>
974    </d:item>
975    
976    <d:item name="in nobr:nobr"
977        class="parse-error"
978        modules="HTML::Parser">
979      <d:message xml:lang="en">The <code>nobr</code> element cannot be
980      nested.</d:message>
981    </d:item>
982    
983    <d:item name="in noscript"
984        class="parse-error"
985        modules="HTML::Parser">
986      <d:message xml:lang="en">The <code><var>{text}</var></code> element is not
987      allowed in a <code>noscript</code> element in the
988      <code>head</code> element.</d:message>
989    </d:item>
990    
991    <d:item name="in noscript:/"
992        class="parse-error"
993        modules="HTML::Parser">
994      <d:message xml:lang="en">An end tag <code>&lt;/<var>{text}</var>></code>
995      appers before the <code>noscript</code> element is closed.</d:message>
996    </d:item>
997    
998    <d:item name="in noscript:#eof"
999        class="parse-error"
1000        modules="HTML::Parser">
1001      <d:message xml:lang="en">A <code>noscript</code> element is not closed
1002      before the end of file.</d:message>
1003    </d:item>
1004    
1005    <d:item name="in noscript:#text"
1006        class="parse-error"
1007        modules="HTML::Parser">
1008      <d:message xml:lang="en">Non‐white‐space characters are not allowed
1009      in a <code>noscript</code> element in the <code>head</code>
1010      element.</d:message>
1011    </d:item>
1012    
1013    <d:item name="in PCDATA:#eof"
1014        class="parse-error"
1015        modules="HTML::Parser">
1016      <d:message xml:lang="en">Element is not closed before the end of
1017      file.</d:message>
1018    </d:item>
1019    
1020    <d:item name="in select"
1021        class="parse-error"
1022        modules="HTML::Parser">
1023      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>&gt;</code>
1024      is not allowed in a <code>select</code> element.</d:message>
1025    </d:item>
1026    
1027    <d:item name="in select:/"
1028        class="parse-error"
1029        modules="HTML::Parser">
1030      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>&gt;</code>
1031      is not allowed in a <code>select</code> element.</d:message>
1032    </d:item>
1033    
1034    <d:item name="in table"
1035        class="parse-error"
1036        modules="HTML::Parser">
1037      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>&gt;</code>
1038      is not allowed in a <code>table</code> element.</d:message>
1039      <d:desc xml:lang="en">
1040        <p>The start or end tag of an element, which
1041        cannot be a child of <code>table</code> element, appears
1042        in the input stream while the <code>table</code> element has been opened
1043        but no other element has been opened.  The document is non-conforming.</p>
1044    
1045        <p>In <code>table</code>, only table related elements
1046        are allowed; any other element must be contained in
1047        <code>td</code> or <code>th</code> element to form
1048        a part of the table, or <code>caption</code> element to create
1049        a table caption.</p>
1050      </d:desc>
1051    </d:item>
1052    
1053    <d:item name="in table:/"
1054        class="parse-error"
1055        modules="HTML::Parser">
1056      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>&gt;</code>
1057      is not allowed in a <code>table</code> element.</d:message>
1058    </d:item>
1059    
1060    <d:item name="in table:#text"
1061        class="parse-error"
1062        modules="HTML::Parser">
1063      <d:message xml:lang="en">Non‐white‐space character is not allowed within
1064      the <code>table</code> element, outside of the caption and cells.</d:message>
1065      <d:desc xml:lang="en">
1066        <p>A non‐white‐space character appears in <code>table</code>.
1067        The document is non-conforming.</p>
1068    
1069        <p>In <code>table</code>, only table related elements
1070        are allowed; any other element and data character must be contained in
1071        <code>td</code> or <code>th</code> element to form
1072        a part of the table, or <code>caption</code> element to create
1073        a table caption.</p>
1074      </d:desc>
1075    </d:item>
1076    
1077    <d:item name="isindex"
1078        class="parse-error"
1079        modules="HTML::Parser">
1080      <d:message xml:lang="en">The <code>isindex</code> element is
1081      obsolete.</d:message>
1082    </d:item>
1083    
1084    <d:item name="missing start tag:tr"
1085        class="parse-error"
1086        modules="HTML::Parser">
1087      <d:message xml:lang="en">Start tag of <code>tr</code>
1088      element is missing.</d:message>
1089      <d:desc>
1090        <p>Start tag of a <code>tr</code> element, which is <em>not</em>
1091        optional, is missing.  The document is non-conforming.</p>
1092    
1093        <p>In a table section, a <code>&lt;tr></code> start tag
1094        must occur before any <code>&lt;td></code> or
1095        <code>&lt;th></code> start tag.  Though the HTML5 parser
1096        implies the <code>&lt;tr></code> start tag before
1097        these start tags, it must be explicitly specified.</p>
1098      </d:desc>
1099    </d:item>
1100    
1101    <d:item name="no DOCTYPE"
1102        class="parse-error"
1103        modules="HTML::Parser">
1104      <d:message xml:lang="en">This document does not start with a
1105      <code>DOCTYPE</code>.</d:message>
1106      <d:desc>
1107        <p>The document does not start with a <code>DOCTYPE</code>.
1108        The document is non-conforming.</p>
1109    
1110        <p>An HTML document must start by a <code>DOCTYPE</code>:
1111          <pre class="html example"><code>&lt;!DOCTYPE HTML></code></pre>
1112        </p>
1113    
1114        <p>Only white space characters and comments are allowed
1115        before the <code>DOCTYPE</code>.  XML declaration is <em>not</em>
1116        allowed in HTML document.</p>
1117      </d:desc>
1118    </d:item>
1119    
1120    <d:item name="not closed"
1121        class="parse-error"
1122        modules="HTML::Parser">
1123      <d:message xml:lang="en">Element <code><var>{text}</var></code> is not
1124      closed.</d:message>
1125      <d:desc>
1126        <p>End tag of an element is not found before, for example,
1127        an end tag of another element appears or
1128        the end of the document.  The document is non-conforming.</p>
1129    
1130        <p>Only <code>body</code>, <code>colgroup</code>, <code>dd</code>,
1131        <code>dt</code>, <code>head</code>, <code>html</code>, <code>li</code>,
1132        <code>ol</code>, <code>option</code>, <code>optgroup</code>,
1133        <code>p</code>, <code>rb</code>, <code>rp</code>, <code>rt</code>,
1134        <code>tbody</code>, <code>td</code>, <code>tfoot</code>,
1135        <code>th</code>, <code>thead</code>, <code>tr</code>,
1136        <code>ul</code> end tag can be omitted in HTML documents.
1137        For any element except for void element, there must be an explicit
1138        end tag.</p>
1139    
1140        <dl class="switch">
1141        <dt>HTML <code>canvas</code> element</dt>
1142          <dd>Though the element is void in earlier versions of Safari,
1143          the <code>canvas</code> element is <em>no</em> longer
1144          defined as empty.  There must be an end tag
1145          <code class="html example">&lt;/canvas></code>.</dd>
1146        </dl>
1147    
1148        <p>Note that misnesting tags, such as
1149        <code class="bad example">&lt;a>&lt;b>&lt;/a>&lt;/b></code>, are not
1150        allowed and they also cause this error.</p>
1151      </d:desc>
1152    </d:item>
1153    
1154    <d:item name="not first start tag"
1155        class="parse-error"
1156        modules="HTML::Parser">
1157      <d:message xml:lang="en">This <code>&lt;html></code> tag is not
1158      the first start tag.</d:message>
1159      <d:desc>
1160        <p>There is a start tag of the <code>html</code> element
1161        that it not the first start tag in the input stream.
1162        The document is non-conforming.</p>
1163    
1164        <p>In an HTML document, there cannot be more than one
1165        <code>html</code> element and therefore there cannot be
1166        more than one <code>&lt;html></code> tag.  In addition,
1167        nothing can be placed before the <code>&lt;html></code> tag
1168        except a <code>DOCTYPE</code>, white space characters,
1169        and comments.</p>
1170      </d:desc>
1171    </d:item>
1172    
1173    <d:item name="not HTML5"
1174        class="parse-error"
1175        modules="HTML::Parser">
1176      <d:message xml:lang="en">This document is written in an old version of
1177      HTML.</d:message>
1178      <d:desc xml:lang="en">
1179        <p>The document contains a <code>DOCTYPE</code> declaration
1180        that is different from HTML5 <code>DOCTYPE</code> (i.e.
1181        <code class="example html">&lt;!DOCTYPE HTML&gt;</code>).
1182        The document is non‐conforming.</p>
1183    
1184        <p>The document might or might not be conformant to
1185        some version of HTML.  However, conformance to any HTML
1186        specification other than HTML5 provides for no practical
1187        convenience, since Web borwsers will parse any
1188        HTML document (roughly) as defined in HTML5.</p>
1189      </d:desc>
1190    </d:item>
1191    
1192    <d:item name="start tag not allowed"
1193        class="parse-error"
1194        modules="HTML::Parser">
1195      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>></code> is
1196      not allowed here.</d:message>
1197    </d:item>
1198    
1199    <d:item name="unmatched end tag"
1200        class="parse-error"
1201        modules="HTML::Parser">
1202      <d:message xml:lang="en">Element <code><var>{text}</var></code> is not
1203      opened.</d:message>
1204      <d:desc>
1205        <p>An end tag appears though no element with the same name
1206        has been opened.  The document is non-conforming.</p>
1207    
1208        <p>For any end tag in HTML document, there must be a
1209        corresponding start tag.</p>
1210    
1211        <dl class="switch">
1212        <dt>HTML <code>base</code>, <code>basefont</code>,
1213        <code>bgsound</code>, <code>br</code>, <code>col</code>,
1214        <code>embed</code>, <code>frame</code>, <code>hr</code>,
1215        <code>image</code>, <code>img</code>, <code>input</code>,
1216        <code>isindex</code>, <code>link</code>, <code>meta</code>,
1217        <code>param</code>, <code>spacer</code>, or <code>wbr</code> element</dt>
1218          <dd>End tag is not allowed for these elements, since
1219          those content must always be empty.  Remove end tag.</dd>
1220        <!-- keygen -->
1221        <!-- command, event-source, nest, source -->
1222        </dl>
1223      </d:desc>
1224    </d:item>
1225    
1226  </section>  </section>
1227    
1228  <section id="element-content-model-errors">  <section id="element-content-model-errors">
1229  <h2>Element Content Model Errors</h2>  <h2>Element Content Model Errors</h2>
1230    
1231    <d:item name="basehref after URL attribute"
1232        modules="ContentChecker::HTML">
1233      <d:message xml:lang="en">The <code>base</code> element with the
1234      <code>href</code> attribute specified cannot be placed after
1235      any attribute with a URL.</d:message>
1236    </d:item>
1237    
1238    <d:item name="basetarget after hyperlink"
1239        modules="ContentChecker::HTML">
1240      <d:message xml:lang="en">The <code>base</code> element with the
1241      <code>target</code> attribute specified cannot be placed after
1242      any element that defines a hyperlink.</d:message>
1243    </d:item>
1244    
1245  <d:item name="character not allowed"  <d:item name="character not allowed"
1246      class="content-model-error">      modules="ContentChecker::HTML RDFXML">
1247    <d:message xml:lang="en">Data character is not allowed in this    <d:message xml:lang="en">Data character is not allowed in this
1248    context.</d:message>    context.</d:message>
1249    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1250      <p>A data character occurs where it is not allowed in this      <p>A data character appears where it is not allowed in this
1251      context.  The document is non-conforming.</p>      context.  The document is non-conforming.</p>
1252    
1253      <p>Possible causes:      <p>Possible causes:
1254        <dl>        <ul>
1255        <dt>If the erred element is an inline-level element (such        <li><p>A data character cannot be a child
1256        as <code>a</code> or <code>span</code>)</dt>        of certain sectioning elements such as <code>body</code>,
1257            <dd><p>A data character cannot be a child        <code>section</code>, and <code>blockquote</code>.</p>
1258            of certain sectioning elements such as <code>body</code>,  
1259            <code>section</code>, and <code>blockquote</code>.</p>        <p>Any inline-level content must be put
1260          in e.g. paragraph element such as <code>p</code>.</p></li>
1261            <p>Any inline-level content must be put        <li><p>Though some elements such as <code>div</code>,
1262            in e.g. paragraph element such as <code>p</code>.</p></dd>        <code>li</code>, and <code>td</code> allow
1263        <dt>If the erred element is a block-level element (such as        <em>either one</em> of block-level or inline-level content
1264        <code>div</code> or <code>h<var>n</var></code>)</dt>        is allowed.  If there is a block-level content,
1265            <dd><p>Though some elements such as <code>div</code>,        any inline-level content must be put
1266            <code>li</code>, and <code>td</code> allow        in e.g. paragraph element such as <code>p</code>.</p></li>
1267            <em>either one</em> of block-level or inline-level content        </ul>
           is allowed.  If there is a block-level content,  
           any inline-level content must be put  
           in e.g. paragraph element such as <code>p</code>.</p></dd>  
       </dl>  
1268      </p>      </p>
1269    </d:desc>    </d:desc>
1270  </d:item>  </d:item>
1271    
1272    <d:item name="character not allowed:empty"
1273        modules="ContentChecker::HTML">
1274      <d:message xml:lang="en">Non‐white‐space characters are not allowed in
1275      an empty element.</d:message>
1276    </d:item>
1277    
1278    <d:item name="character not allowed:atom|PersonConstruct"
1279        modules="ContentChecker::HTML">
1280      <d:message xml:lang="en">Non‐white‐space characters are not allowed in
1281      Person construct.</d:message>
1282    </d:item>
1283    
1284    <d:item name="character not allowed:atom|TextConstruct"
1285        modules="ContentChecker::HTML">
1286      <d:message xml:lang="en">Non‐white‐space characters are not allowed in
1287      Text construct.</d:message>
1288    </d:item>
1289    
1290  <d:item name="child element missing"  <d:item name="child element missing"
1291      class="content-model-error">      modules="ContentChecker::HTML ContentChecker::Atom">
1292    <d:message xml:lang="en">There must be a <code><var>$0</var></code>    <d:message xml:lang="en">There must be an element
1293    element as a child of this element.</d:message>    <code><var>{text}</var></code> as a child of this element.</d:message>
1294    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1295      <p>The content model of the element is so defined that it      <p>The content model of the element is so defined that it
1296      must contain a <code><var>$0</var></code> child element.      must contain a <code><var>$0</var></code> child element.
1297      Without such an element, the document is non-conforming.</p>      The document is non-conforming.</p>
1298    
1299      <p>For example:      <dl class="switch">
1300        <ul>      <dt>HTML <code>head</code> element</dt>
1301        <li>The <code>head</code> element must contain exactly one        <dd>There must be a <code>title</code> child element.</dd>
1302        <code>title</code> child element.</li>      <dt>HTML <code>html</code> element</dt>
1303        <li><a href="#child-element-missing:td%7Cth">The <code>tr</code>        <dd>There must be a <code>head</code> child element followed
1304        element must contain one or more <code>td</code> or <code>th</code>        by a <code>body</code> element.</dd>
1305        child element.</a></li>      <dt>HTML <code>tr</code> element</dt>
1306        </ul>        <dd><a href="#child-element-missing:td%7Cth">There must be
1307      </p>        one or more <code>td</code> or <code>th</code> child element.</a></dd>
1308        </dl>
1309    </d:desc>    </d:desc>
1310  </d:item>  </d:item>
1311    
# Line 117  Web Document Conformance Checker (BETA)< Line 1315  Web Document Conformance Checker (BETA)<
1315    or <code>th</code> element as a child of this element.</d:message>    or <code>th</code> element as a child of this element.</d:message>
1316    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1317      <p>The <code>tr</code> element must contain at least one      <p>The <code>tr</code> element must contain at least one
1318      <code>td</code> or <code>th</code> child element.  Without      <code>td</code> or <code>th</code> child element.  The document
1319      such an element, the document is non-conforming.</p>      is non-conforming.</p>
1320    </d:desc>    </d:desc>
1321  </d:item>  </d:item>
1322    
1323    <d:item name="child element missing:atom"
1324        modules="ContentChecker::HTML">
1325      <d:message xml:lang="en">There must be an element
1326      <code><var>{text}</var></code> in the Atom namespace as a child of this
1327      element.</d:message>
1328    </d:item>
1329    
1330    <d:item name="child element missing:atom:link:alternate"
1331        modules="ContentChecker::HTML">
1332      <d:message xml:lang="en">There must be an Atom <code>link</code> element
1333      whose <code>rel</code> attribute is set to <code>alternate</code> as a
1334      child of this element.</d:message>
1335    </d:item>
1336    
1337    <d:item name="child element missing:atom:link:self"
1338        modules="ContentChecker::HTML">
1339      <d:message xml:lang="en">There should be an Atom <code>link</code> element
1340      whose <code>rel</code> attribute is set to <code>self</code> as a
1341      child of this element.</d:message>
1342    </d:item>
1343    
1344    <d:item name="element missing:hn"
1345        modules="ContentChecker::HTML">
1346      <d:message xml:lang="en">There must be at least one
1347      <code>h<var>n</var></code> element descendant.</d:message>
1348    </d:item>
1349    
1350  <d:item name="element not allowed"  <d:item name="element not allowed"
1351      class="content-model-error">      modules="ContentChecker::HTML ContentChecker::Atom RDFXML">
1352    <d:message xml:lang="en">This element is not allowed in this    <d:message xml:lang="en">This element is not allowed in this
1353    context.</d:message>    context.</d:message>
1354    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1355      <p>An element occurs where it is not allowed.  The document      <p>An element appears where it is not allowed.  The document
1356      is non-conforming.</p>      is non-conforming.</p>
1357    
1358      <p>Possible causes:      <p>Possible causes:
1359        <dl>        <dl class="switch">
1360        <dt>If the erred element is an inline-level element (such        <dt>If the element with the error is an inline-level element,
1361        as <code>a</code> or <code>span</code>)</dt>        such as <code>a</code>, <code>progress</code>, or <code>img</code></dt>
1362            <dd><p>An inline-level element cannot be a child            <dd><p>An inline-level element cannot be a child
1363            of certain sectioning elements such as <code>body</code>,            of certain sectioning elements such as <code>body</code>,
1364            <code>section</code>, and <code>blockquote</code>.</p>            <code>section</code>, and <code>blockquote</code>.</p>
1365    
1366            <p>Any inline-level content must be put            <p>Any inline-level content must be put
1367            in e.g. paragraph element such as <code>p</code>.</p></dd>            in e.g. paragraph element such as <code>p</code>.</p></dd>
1368        <dt>If the erred element is a block-level element (such as        <dt>If it is a block-level elements, such as <code>aside</code>,
1369        <code>div</code> or <code>h<var>n</var></code>)</dt>        <code>div</code>, <code>h<var>n</var></code>,
1370            <dd><p>Though some elements such as <code>div</code>,        <code>p</code>, or <code>section</code></dt>
1371            <code>li</code>, and <code>td</code> allow            <dd><dl class="switch">
1372            <em>either one</em> of block-level or inline-level content                <dt>If the parent element is <code>div</code>,
1373            is allowed.  If there is a block-level content,                <code>li</code>, <code>td</code>, or <code>th</code></dt>
1374            any inline-level content must be put                <!-- @@ TODO: more... -->
1375            in e.g. paragraph element such as <code>p</code>.</p></dd>                    <!-- @@ TODO: <p><ul><li><p> -->
1376        <dt>If the erred element is the root <code>html</code> element</dt>                    <dd><p>The parent element allows <em>either</em>
1377            <dd><p>In an XHTML document, the root <code>html</code>                    block-level or inline-level content.  If there is a
1378            element must have an <code>xmlns</code> attribute                    block-level content, any inline-level content must be
1379            whose value is set to                    put in e.g. paragraph element such as <code>p</code>.</p>
1380            <code>http://www.w3.org/1999/xhtml</code>.</p></dd>                    <p>For example, an HTML document fragment
1381                      <code class="html bad example">&lt;div>&lt;p>Hello!&lt;/p> World!&lt;/div></code>
1382                      is non-conforming, since a word <q>World!</q> does not belong
1383                      to any paragraph.  (If not part of any paragraph, what is
1384                      it!?)  A conforming example would be:
1385                        <pre class="html example"><code>&lt;div>&lt;p>Hello!&lt;/p> &lt;p>World!&lt;/p>&lt;/div></code></pre>
1386                      </p></dd>
1387                  <dt>If the parent element does <em>not</em> allow
1388                  block-level elements as content</dt>
1389                      <dd>The element is not allowed to be inserted here.
1390                      For example, a <code>div</code> element cannot be
1391                      a child of an <code>h1</code> element.</dd>
1392              </dl></dd>
1393          <dt>If the element with the error is a <code>noscript</code> element</dt>
1394              <dd>The <code>noscript</code> element is allowed only in the context
1395              where a block-level or inline-level content is expected
1396              and in the <code>head</code> element.
1397              It cannot be used in e.g. <code>ul</code>, <code>table</code>,
1398              or <code>select</code>.</dd>
1399          <dt>If the element with the error is <code>blink</code>,
1400          <code>center</code>, or <code>marquee</code> element</dt>
1401              <dd>These elements are not part of the HTML standard.
1402              Use CSS for styling control.</dd>
1403    
1404          <dt><code>button</code>, <code>datalist</code>,
1405          <code>fieldset</code>, <code>form</code>,
1406          <code>input</code>, <code>label</code>,
1407          <code>optgroup</code>, <code>option</code>, <code>output</code>,
1408          <code>rb</code>, <code>rp</code>, <code>rt</code>, <code>ruby</code>,
1409          <code>textarea</code>, or <code>textarea</code> element</dt>
1410          <!-- rbc, rtc ? -->
1411              <dd>These elements are intentionally not supported by the conformance
1412              checker <em>yet</em>.</dd>
1413        </dl>        </dl>
1414      </p>      </p>
1415    </d:desc>    </d:desc>
1416  </d:item>  </d:item>
1417    
1418  enumerated:invalid;attribute-error;This attribute only allow a limited set of values and the specified value is not one of them.  <d:item name="element not allowed:area"
1419  no DOCTYPE;parse-error;This document does not start with the <code>DOCTYPE</code> declaration.      modules="ContentChecker ContentChecker::HTML">
1420  not HTML5;parse-error;This document is written in an old version of HTML.    <d:message xml:lang="en">An <code>area</code> element cannot be used
1421  not closed;parse-error;Element <code>$0</code> is not closed.    outside of a <code>map</code> element.</d:message>
1422  unmatched end tag;parse-error;Element <code>$0</code> is not opened.  </d:item>
1423    
1424  table:no cell in last row;table-model-error;The table has no cell (<code>td</code> or <code>th</code>) in the last row.  <d:item name="element not allowed:base"
1425        modules="ContentChecker ContentChecker::HTML">
1426  s:IMT:obsolete subtype;should;An <em>obsolete</em> subtype is used.    <d:message xml:lang="en">There is another <code>base</code>
1427  s:IMT:private subtype;should;A private (<code>x-</code> or <code>x.</code>) subtype is used.    element.</d:message>
1428  s:IMT:unregistered subtype;should;The subtype is not registered to IANA.  </d:item>
1429    
1430    <d:item name="element not allowed:datatemplate"
1431        modules="ContentChecker ContentChecker::HTML">
1432      <d:message xml:lang="en">In a <code>datatemplate</code> element, only
1433      <code>rule</code> elements are allowed.</d:message>
1434    </d:item>
1435    
1436    <d:item name="element not allowed:details legend"
1437        modules="ContentChecker::HTML">
1438      <d:message xml:lang="en">In a <code>details</code> element, only at the
1439      beginning of the element a <code>lengend</code> element
1440      may be used.</d:message>
1441    </d:item>
1442    
1443    <d:item name="element not allowed:empty"
1444        modules="ContentChecker::HTML ContentChecker::Atom">
1445      <d:message xml:lang="en">Elements are not allowed in an empty
1446      element.</d:message>
1447    </d:item>
1448    
1449    <d:item name="element not allowed:figure legend"
1450        modules="ContentChecker::HTML">
1451      <d:message xml:lang="en">In a <code>figure</code> element, only at the
1452      beginning or only at the end of the element a <code>lengend</code> element
1453      may be used.</d:message>
1454    </d:item>
1455    
1456    <d:item name="element not allowed:flow"
1457        modules="ContentChecker::HTML">
1458      <d:message xml:lang="en">This element is not allowed where flow
1459      content is expected.</d:message>
1460    </d:item>
1461    
1462    <d:item name="element not allowed:flow style"
1463        modules="ContentChecker::HTML">
1464      <d:message xml:lang="en">A <code>style</code> element without
1465      <code>scoped</code> attribute is not allowed in this context.</d:message>
1466    </d:item>
1467    
1468    <d:item name="element not allowed:head noscript"
1469        modules="ContentChecker::HTML">
1470      <d:message xml:lang="en">This element is not allowed in a
1471      <code>noscript</code> element in the <code>head</code> element.</d:message>
1472    </d:item>
1473    
1474    <d:item name="element not allowed:head style"
1475        modules="ContentChecker::HTML">
1476      <d:message xml:lang="en">A <code>style</code> element with
1477      <code>scoped</code> attribute is not allowed in the <code>head</code>
1478      element.</d:message>
1479    </d:item>
1480    
1481    <d:item name="element not allowed:head title"
1482        modules="ContentChecker ContentChecker::HTML">
1483      <d:message xml:lang="en">There is another <code>title</code>
1484      element.</d:message>
1485    </d:item>
1486    
1487    <d:item name="element not allowed:minus"
1488        modules="ContentChecker ContentChecker::HTML">
1489      <d:message xml:lang="en">This element is not allowed in this
1490      context.</d:message>
1491    </d:item>
1492    
1493    <d:item name="element not allowed:meta charset"
1494        modules="ContentChecker::HTML">
1495      <d:message xml:lang="en">The character encoding declaration must be the
1496      first element in the <code>head</code> element.</d:message>
1497    </d:item>
1498    
1499    <d:item name="element not allowed:metadata"
1500        modules="ContentChecker::HTML">
1501      <d:message xml:lang="en">This element is not allowed where metadata
1502      content is expected.</d:message>
1503    </d:item>
1504    
1505    <d:item name="element not allowed:phrasing"
1506        modules="ContentChecker::HTML">
1507      <d:message xml:lang="en">This element is not allowed where phrasing
1508      content is expected.</d:message>
1509    </d:item>
1510    
1511    <d:item name="element not allowed:root"
1512        modules="ContentChecker">
1513      <d:message xml:lang="en">This element is not allowed as the root
1514      element of a document.</d:message>
1515      <d:desc xml:lang="en">
1516        <p>An element that is not allowed as the root element
1517        is used as the root element of the document.  The document is
1518        non-conforming, as far as the conformance checker can tell.</p>
1519    
1520        <dl class="switch">
1521        <dt><code>html</code> element in an XHTML document</dt>
1522            <dd><p>In <abbr>XHTML</abbr> document, the root <code>html</code>
1523            element must have an <code>xmlns</code> attribute as:
1524              <pre class="xml example"><code>&lt;html xmlns="http://www.w3.org/1999/xhtml"></code></pre></p></dd>
1525        <dt><code>rss</code> element</dt>
1526            <dd><p>The document is written in some version of RSS.</p>
1527            <p>The conformance checker does not support any version
1528            of RSS.  Use Atom 1.0 for feed documents.</p></dd>
1529        <dt><code>feed</code> element</dt>
1530            <dd><p>The Atom <code>feed</code> element must be
1531            in the <code>http://www.w3.org/2005/Atom</code>
1532            namespace as:
1533              <pre class="xml example"><code>&lt;feed xmlns="http://www.w3.org/2005/Atom"></code></pre>
1534            </p>
1535            <p>The conformance checker does not support Atom 0.3.
1536            Use Atom 1.0 for feed documents.</p></dd>
1537        </dl>
1538      </d:desc>
1539    </d:item>
1540    
1541    <d:item name="element not allowed:root:xml"
1542        modules="ContentChecker">
1543      <d:message xml:lang="en">This element is not allowed as the root element
1544      of an XML document.</d:message>
1545    </d:item>
1546    
1547    <d:item name="element not allowed:ruby base"
1548        modules="ContentChecker">
1549      <d:message xml:lang="en">This element is not allowed in the <code>ruby</code>
1550      element.</d:message>
1551    </d:item>
1552    
1553    <d:item name="element not allowed:text"
1554        modules="ContentChecker::HTML">
1555      <d:message xml:lang="en">This element is not allowed in this
1556      context.</d:message>
1557    </d:item>
1558    
1559    <d:item name="element not allowed:atom|content"
1560        modules="ContentChecker::Atom">
1561      <d:message xml:lang="en">This element is not allowed in an Atom
1562      <code>content</code> element.</d:message>
1563    </d:item>
1564    
1565    <d:item name="element not allowed:atom|PersonConstruct"
1566        modules="ContentChecker::Atom">
1567      <d:message xml:lang="en">This element is not allowed in Person
1568      construct.</d:message>
1569    </d:item>
1570    
1571    <d:item name="element not allowed:atom|TextConstruct"
1572        modules="ContentChecker::Atom">
1573      <d:message xml:lang="en">This element is not allowed in Text
1574      construct.</d:message>
1575    </d:item>
1576    
1577    <d:item name="element not defined"
1578        modules="ContentChecker">
1579      <d:message xml:lang="en">This element is not defined.</d:message>
1580    </d:item>
1581    
1582    <d:item name="no significant content"
1583        modules="ContentChecker::HTML">
1584      <d:message xml:lang="en">No significant content is contained
1585      in this element.</d:message>
1586    </d:item>
1587    
1588    <d:item name="no significant content before"
1589        modules="ContentChecker::HTML">
1590      <d:message xml:lang="en">There is no significant content
1591      before this element.</d:message>
1592    </d:item>
1593    
1594    <d:item name="no significant content at the end"
1595        modules="ContentChecker::HTML">
1596      <d:message xml:lang="en">No significant content is contained
1597      at the end of this element.</d:message>
1598    </d:item>
1599    
1600    <d:item name="ps element missing"
1601        modules="ContentChecker::HTML">
1602      <d:message xml:lang="en">There is no <code><var>{text}</var></code>
1603      element before this element.</d:message>
1604      <d:desc xml:lang="en">
1605        <p>There must be an element before another element, but there
1606        is not.  The document is non-conforming.</p>
1607    
1608        <p>For example, there must be a <code>dt</code> element
1609        before any <code>dd</code> element.</p>
1610      </d:desc>
1611    </d:item>
1612    
1613    <d:item name="rp:syntax error"
1614        modules="ContentChecker::HTML">
1615      <d:message xml:lang="en">The content of a <code>rp</code> element must
1616      be a parenthesis.</d:message>
1617    </d:item>
1618    
1619    </section>
1620    
1621    <section id="attribute-errors">
1622    <h2>Attribute Errors</h2>
1623    
1624    <d:item name="attribute missing"
1625        modules="ContentChecker::HTML">
1626      <d:message xml:lang="en">Required attribute <code><var>{text}</var></code>
1627      is not specified.</d:message>
1628      <d:desc>
1629        <p>A required attribute is not specified.  The document
1630        is non-conforming.</p>
1631    
1632        <p>Some attribute is defined as <i>required</i>.
1633        Without required attributes specified, user agents
1634        cannot provide full functionality of the element to the user.</p>
1635    
1636        <dl class="switch">
1637        <dt>HTML <code>img</code> element</dt>
1638            <dd>The <code>src</code> attribute must be specified.
1639            Additionally, the <code>alt</code> attribute must be specified
1640            in many cases.</dd>
1641        <dt>HTML <code>link</code> element</dt>
1642            <dd>The <code>rel</code> attribute must be specified.
1643            Note that the <code>rev</code> attribute is obsolete.</dd>
1644        </dl>
1645      </d:desc>
1646    </d:item>
1647    
1648    <d:item name="attribute missing:data|type"
1649        modules="ContentChecker::HTML">
1650      <d:message xml:lang="en">For an <code>object</code> at least one of
1651      <code>data</code> and <code>type</code> attributes must be
1652      specified.</d:message>
1653    </d:item>
1654    
1655    <d:item name="attribute missing:href|target"
1656        modules="ContentChecker::HTML">
1657      <d:message xml:lang="en">For a <code>base</code> element, at least one of
1658      <code>href</code> and <code>target</code> attributes must be
1659      specified.</d:message>
1660    </d:item>
1661    
1662    <d:item name="attribute missing:name|http-equiv"
1663        modules="ContentChecker::HTML">
1664      <d:message xml:lang="en">For a <code>meta</code> element with the
1665      <code>content</code> attribute specified, exactly one of
1666      <code>name</code> and <code>http-equiv</code> attributes must be
1667      specified.</d:message>
1668    </d:item>
1669    
1670    <d:item name="attribute missing:name|http-equiv|charset"
1671        modules="ContentChecker::HTML">
1672      <d:message xml:lang="en">For a <code>meta</code> element, exactly one of
1673      <code>name</code>, <code>http-equiv</code>, and <code>charset</code>
1674      attributes must be specified.</d:message>
1675    </d:item>
1676    
1677    <d:item name="attribute not allowed"
1678        modules="ContentChecker::HTML RDFXML">
1679      <d:message xml:lang="en">Attribute
1680      <code><var>{local-name}</var></code> is not allowed for
1681      <code><var>{element-local-name}</var></code> element.</d:message>
1682      <d:desc xml:lang="en">
1683        <p>An attribute is specified where it is not allowed.
1684        The document is non-conforming.</p>
1685    
1686        <dl>
1687        <dt>HTML <code>meta</code> element</dt>
1688            <dd>For HTML <code>meta</code> element, <em>only one</em> of
1689            <code>name</code>, <code>http-equiv</code>, or <code>charset</code>
1690            attribute is allowed.</dd>
1691        </dl>
1692      </d:desc>
1693    </d:item>
1694    
1695    <d:item name="attribute not allowed:ismap"
1696        modules="ContentChecker::HTML">
1697      <d:message xml:lang="en">The <code>ismap</code> attribute may only be
1698      used for the image contained in an <code>a</code> element.</d:message>
1699    </d:item>
1700    
1701    <d:item name="attribute not defined"
1702        modules="ContentChecker">
1703      <d:message xml:lang="en">This attribute is not defined.</d:message>
1704    </d:item>
1705    
1706    <d:item name="in HTML:xml:lang"
1707        class="attribute-error"
1708        modules="ContentChecker::XML">
1709      <d:message xml:lang="en">The <code>xml:lang</code> attribute is not
1710      allowed in HTML document.</d:message>
1711      <d:desc xml:lang="en">
1712        <p>The <code>xml:lang</code> attribute is not allowed in
1713        HTML document.  The document is non-conforming.</p>
1714    
1715        <p>Use of the <code>xml:lang</code> attribute is conforming
1716        <em>only</em> in XML documents.</p>
1717    
1718        <p>To specify natural language information in HTML document,
1719        use <code>lang</code> attribute instead.</p>
1720    
1721        <p>XHTML 1.0 Appendix C was encouraged to specify both
1722        <code>lang</code> and <code>xml:lang</code> attributes with
1723        the same value.  Such a duplication has <em>no effect</em> in practice.
1724        Use only one of <code>lang</code> (in HTML) or <code>xml:lang</code> (in
1725        XML).</p>
1726    
1727        <!-- @@ ISSUE: xml:lang in non-HTML element in DOM5 HTML created
1728             from an HTML document? -->
1729      </d:desc>
1730    </d:item>
1731    
1732    <d:item name="in XML:charset"
1733        modules="ContentChecker::HTML">
1734      <d:message xml:lang="en">The <code>charset</code> attribute is not
1735      allowed in XML document.</d:message>
1736      <d:desc>
1737        <p>The <code>charset</code> attribute of a
1738        <code>meta</code> element is not allowed in XML document.
1739        The document is non-conforming.</p>
1740    
1741        <p>To specify the character encoding used for serialization,
1742        if necessary, use XML declaration instead:
1743          <pre class="xml example"><code>&lt;?xml version="1.0" encoding="<var>encoding-name</var>"?></code></pre>
1744        </p>
1745      </d:desc>
1746    </d:item>
1747    
1748    <d:item name="in XML:lang"
1749        modules="ContentChecker::HTML">
1750      <d:message xml:lang="en">The <code>lang</code> attribute is not
1751      allowed in XML document.</d:message>
1752      <d:desc>
1753        <p>The HTML <code>lang</code> attribute is not allowed in
1754        XML document.  The document is non-conforming.</p>
1755    
1756        <p>The <code>lang</code> attribute in <code>null</code>
1757        namespace for HTML elements is conforming <em>only</em> in
1758        HTML documents.</p>
1759    
1760        <p>To specify natural language information in XML document,
1761        use <code>xml:lang</code> attribute instead.</p>
1762      </d:desc>
1763    </d:item>
1764    
1765    <d:item name="in XML:noscript"
1766        modules="ContentChecker::HTML">
1767      <d:message xml:lang="en">A <code>noscript</code> element cannot be
1768      used in XML document.</d:message>
1769    </d:item>
1770    
1771    <d:item name="in XML:xmlns"
1772        modules="ContentChecker::HTML">
1773      <d:message xml:lang="en">The <code>xmlns</code> attribute
1774      in the <code>null</code> namespace is not allowed in
1775      XHTML document.  The document is non-conforming.</d:message>
1776      <d:desc>
1777        <p>The <code>xmlns</code> attribute in the <code>null</code>
1778        namespace is not allowed in XHTML document.</p>
1779    
1780        <p>This error should not occur in conformance-checking of
1781        static documents.</p>
1782      </d:desc>
1783    </d:item>
1784    
1785    </section>
1786    
1787    <section id="attribute-value-errors">
1788    <h2>Attribute Value Errors</h2>
1789    
1790    <d:item name="boolean:invalid"
1791        modules="ContentChecker::HTML">
1792      <d:message xml:lang="en">Attribute value <code><var>{@}</var></code>
1793      is not allowed.  It must be an empty string or a string
1794      <code><var>{local-name}</var></code>.</d:message>
1795    </d:item>
1796    
1797    <d:item name="char:syntax error"
1798        modules="ContentChecker::HTML">
1799      <d:message xml:lang="en">The attribute value must be exactly one
1800      character.</d:message>
1801    </d:item>
1802    
1803    <d:item name="charref in charset"
1804        modules="ContentChecker::HTML">
1805      <d:message xml:lang="en">A character reference cannot be used to
1806      represent a character encoding name.</d:message>
1807    </d:item>
1808    
1809    <d:item name="charset:not preferred"
1810        modules="ContentChecker::HTML">
1811      <d:message xml:lang="en">Character encoding name
1812      <code><var>{value}</var></code> is not the preferred name of that
1813      character encoding.</d:message>
1814    </d:item>
1815    
1816    <d:item name="charset:not registered"
1817        modules="ContentChecker::HTML">
1818      <d:message xml:lang="en">Character encoding name
1819      <code><var>{value}</var></code> is not a registered name.</d:message>
1820      <d:desc xml:lang="en">
1821        <p>The specified character encoding name is not registered to
1822        <abbr>IANA</abbr>.  Use of registered character encoding name
1823        is a good practice to facilitate interoperability.</p>
1824    
1825        <dl class="switch">
1826        <dt><code>EUC-TW</code></dt>
1827          <dd><code>EUC-TW</code> is not registered.  Unfortunately, there
1828          is no registered name for that character encoding.  Use
1829          Big5 encoding with character encoding name <code>Big5</code>
1830          if it is enough to represent the document.</dd>
1831        <dt><code>ISO-2022-JP-1</code></dt>
1832          <dd><code>ISO-2022-JP-1</code> is not registered, nevertheless
1833          this character encoding name is documented in
1834          <a href="urn:ietf:rfc:2237"><abbr>RFC</abbr> 2237</a>.  Use
1835          <code>ISO-2022-JP-2</code> instead, since that character encoding
1836          is a superset of ISO-2022-JP-1.</dd>
1837        <dt><code>ISO-2022-JP-3</code>, <code>ISO-2022-JP-3-plane1</code></dt>
1838          <dd>These names are not registered and obsoleted in favor of
1839          <code>ISO-2022-JP-2004</code> and
1840          <code>ISO-2022-JP-2004-plane1</code>.</dd>
1841        <dt><code>ISO-2022-JP-2003</code>,
1842        <code>ISO-2022-JP-2003-plane1</code></dt>
1843          <dd>These names are not registered and corrected to
1844          <code>ISO-2022-JP-2004</code> and
1845          <code>ISO-2022-JP-2004-plane1</code>.</dd>
1846        <dt><code>ISO-2022-JP-2004</code>,
1847        <code>ISO-2022-JP-2004-plane1</code></dt>
1848          <dd>These names are not registered.  Unfortunately, there is
1849          no registered name for these character encodings.</dd>
1850        <dt><code>UTF-8N</code></dt>
1851          <dd><code>UTF-8N</code> is not registered.  Character encoding
1852          name <code>UTF-8</code> represents UTF-8 encoding with or
1853          without <abbr>BOM</abbr>.</dd>
1854        </dl>
1855    
1856        <p><strong>WARNING</strong>: This error might be raised for
1857        a registered character encoding name, since the character encoding
1858        name database of the conformance checker is not complete yet.</p>
1859      </d:desc>
1860    </d:item>
1861    
1862    <d:item name="charset:private"
1863        modules="ContentChecker::HTML">
1864      <d:message xml:lang="en">Character encoding name
1865      <code><var>{value}</var></code> is a private name.</d:message>
1866      <d:desc xml:lang="en">
1867        <p>The specified character encoding name is a private name and
1868        not registered to <abbr>IANA</abbr>.  Use of registered character
1869        encoding name is a good practice to facilitate interoperability.</p>
1870    
1871        <dl class="switch">
1872        <dt><code>x-euc-jp</code></dt>
1873          <dd>Use <code>EUC-JP</code> for the Japanese <abbr>EUC</abbr>
1874          character encoding.</dd>
1875        <dt><code>x-sjis</code></dt>
1876          <dd>Use <code>Shift_JIS</code> for standard Shift encoding scheme of
1877          <abbr>JIS</abbr> coded character set, or <code>Windows-31J</code>
1878          for Microsoft standard character set as implemented by
1879          Microsoft Windows.</dd>
1880        </dl>
1881      </d:desc>
1882    </d:item>
1883    
1884    <d:item name="charset:syntax error"
1885        modules="ContentChecker::HTML">
1886      <d:message xml:lang="en">The specified value <code><var>{value}</var></code>
1887      is syntactically not a character encoding name.</d:message>
1888      <d:desc xml:lang="en">
1889        <p>The attribute value must be a character encoding name.  However,
1890        the specified value is not a character encoding name syntactically.
1891        The document is non‐conforming.</p>
1892        <p>Character encoding name is a string of <abbr>ASCII</abbr>
1893        printable characters, up to 40 characters.</p>
1894      </d:desc>
1895    </d:item>
1896    
1897    <d:item name="color:syntax error"
1898        modules="ContentChecker::HTML">
1899      <d:message xml:lang="en">The specified value is not a color
1900      name or hexadecimal color number.</d:message>
1901    </d:item>
1902    
1903    <d:item name="coords:number not 3"
1904        modules="ContentChecker::HTML">
1905      <d:message xml:lang="en">The <code>coords</code> attribute have to
1906      contain three (3) numbers (specified:
1907      <code><var>{text}</var></code>).</d:message>
1908    </d:item>
1909    
1910    <d:item name="coords:number not 4"
1911        modules="ContentChecker::HTML">
1912      <d:message xml:lang="en">The <code>coords</code> attribute have to
1913      contain four (4) numbers (specified:
1914      <code><var>{text}</var></code>).</d:message>
1915    </d:item>
1916    
1917    <d:item name="coords:number lt 6"
1918        modules="ContentChecker::HTML">
1919      <d:message xml:lang="en">The <code>coords</code> attribute have to
1920      contain more than or equal to six (6) numbers (specified:
1921      <code><var>{text}</var></code>).</d:message>
1922    </d:item>
1923    
1924    <d:item name="coords:number not even"
1925        modules="ContentChecker::HTML">
1926      <d:message xml:lang="en">The <code>coords</code> attribute have to
1927      contain even number of numbers (specified:
1928      <code><var>{text}</var></code>).</d:message>
1929    </d:item>
1930    
1931    <d:item name="coords:out of range"
1932        modules="ContentChecker::HTML">
1933      <d:message xml:lang="en">The specified value <code><var>{value}</var></code>
1934      is out of range.</d:message>
1935    </d:item>
1936    
1937    <d:item name="coords:syntax error"
1938        modules="ContentChecker::HTML">
1939      <d:message xml:lang="en">The specified value is not valid.</d:message>
1940    </d:item>
1941    
1942    <d:item name="datetime:bad year"
1943        modules="ContentChecker::HTML">
1944      <d:message xml:lang="en">Year number is out of range.</d:message>
1945    </d:item>
1946    
1947    <d:item name="datetime:bad month"
1948        modules="ContentChecker::HTML">
1949      <d:message xml:lang="en">Month number is out of range.</d:message>
1950    </d:item>
1951    
1952    <d:item name="datetime:bad day"
1953        modules="ContentChecker::HTML">
1954      <d:message xml:lang="en">Day number is out of range.</d:message>
1955    </d:item>
1956    
1957    <d:item name="datetime:bad hour"
1958        modules="ContentChecker::HTML">
1959      <d:message xml:lang="en">Hour number is out of range.</d:message>
1960    </d:item>
1961    
1962    <d:item name="datetime:bad minute"
1963        modules="ContentChecker::HTML">
1964      <d:message xml:lang="en">Minute number is out of range.</d:message>
1965    </d:item>
1966    
1967    <d:item name="datetime:bad second"
1968        modules="ContentChecker::HTML">
1969      <d:message xml:lang="en">Second number is out of range.</d:message>
1970    </d:item>
1971    
1972    <d:item name="datetime:bad timezone hour"
1973        modules="ContentChecker::HTML">
1974      <d:message xml:lang="en">Hour number of the timezone component is out of
1975      range.</d:message>
1976    </d:item>
1977    
1978    <d:item name="datetime:bad timezone minute"
1979        modules="ContentChecker::HTML">
1980      <d:message xml:lang="en">Minute number of the timezone component is out of
1981      range.</d:message>
1982    </d:item>
1983    
1984    <d:item name="datetime:syntax error"
1985        modules="ContentChecker::HTML">
1986      <d:message xml:lang="en">The attribute value is not a datetime.</d:message>
1987    </d:item>
1988    
1989    <d:item name="dateortime:syntax error"
1990        modules="ContentChecker::HTML">
1991      <d:message xml:lang="en">The attribute value is not a date or
1992      time.</d:message>
1993    </d:item>
1994    
1995    <d:item name="enumerated:invalid"
1996        modules="ContentChecker::HTML">
1997      <d:message xml:lang="en">This attribute only allow a limited set of
1998      values and the specified value <code><var>{@}</var></code> is not one
1999      of them.</d:message>
2000      <d:desc xml:lang="en">
2001        <p>For this attribute only several values are allowed and the
2002        value of the attribute is not one of them.  The document
2003        is non-conforming.</p>
2004    
2005        <dl>
2006        <dt>HTML <code>meta</code> element, <code>http-equiv</code> attribute</dt>
2007            <dd><p>Only values <code>Default-Style</code> and <code>Refresh</code>
2008            are allowed.</p>
2009            <p>Value <code>Content-Type</code> is obsolete; for charset
2010            declaration, the <code>charset</code> attribute can be used as:
2011            <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
2012            ... where <var>charset-name</var> is a name of the character encoding
2013            of the document, such as <code>utf-8</code>.</p>
2014            <p>Values <code>Content-Style-Type</code> and
2015            <code>Content-Script-Type</code> are currently not allowed.</p>
2016            <p>Value <code>Keywords</code> is not allowed.  Use
2017            <code>name</code> attribute instead of <code>http-equiv</code>
2018            attribute.</p>
2019            <p>Values <code>Expires</code>, <code>Pragma</code>,
2020            and <code>Cache-Control</code> are not allowed;
2021            use <em>real</em> HTTP header fields for cache control.</p></dd>
2022        </dl>
2023      </d:desc>
2024    </d:item>
2025    
2026    <d:item name="enumerated:invalid:http-equiv:content-type"
2027        class="attribute-value-error">
2028      <d:message xml:lang="en">Character encoding declaration syntax
2029      <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
2030      is obsolete.</d:message>
2031      <d:desc xml:lang="en">
2032        <p>Old long character encoding declaration syntax
2033        <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
2034        is in use.  The document is non‐conforming.</p>
2035    
2036        <p>The new character encoding declaration syntax is:
2037          <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
2038        </p>
2039      </d:desc>
2040    </d:item>
2041    
2042    <d:item name="enumerated:non-conforming"
2043        modules="ContentChecker::HTML">
2044      <d:message xml:lang="en">Attribute value <code><var>{@}</var></code>
2045      is not allowed.</d:message>
2046    </d:item>
2047    
2048    <d:item name="duplicate http-equiv"
2049        modules="ContentChecker::HTML">
2050      <d:message xml:lang="en">There is another pragma
2051      <code><var>{value}</var></code>.</d:message>
2052    </d:item>
2053    
2054    <d:item name="duplicate ID"
2055        class="attribute-value-error"
2056        modules="ContentChecker::XML ContentChecker::HTML">
2057      <d:message xml:lang="en">This identifier has already been
2058      assigned to another element.</d:message>
2059      <!-- @@ <id=a xml:id=a>? -->
2060    </d:item>
2061    
2062    <d:item name="duplicate token"
2063        modules="ContentChecker::HTML HTML::Table">
2064      <d:message xml:lang="en">The token <code><var>{value}</var></code>
2065      appears in the attribute value twice.</d:message>
2066    </d:item>
2067    
2068    <d:item name="empty attribute value"
2069        modules="ContentChecker::HTML">
2070      <d:message xml:lang="en">The attribute value must not be empty.</d:message>
2071    </d:item>
2072    
2073    <d:item name="float:out of range"
2074        modules="ContentChecker::HTML">
2075      <d:message xml:lang="en">The specified value is out of range.</d:message>
2076    </d:item>
2077    
2078    <d:item name="float:syntax error"
2079        modules="ContentChecker::HTML">
2080      <d:message xml:lang="en">The attribute value is not a real
2081      number.</d:message>
2082    </d:item>
2083    
2084    <d:item name="fragment points itself"
2085        modules="ContentChecker">
2086      <d:message xml:lang="en">A fragment identifier references the element
2087      itself.</d:message>
2088    </d:item>
2089    
2090    <d:item name="fragment points nothing"
2091        modules="ContentChecker">
2092      <d:message xml:lang="en">A fragment identifier references no
2093      node.</d:message>
2094    </d:item>
2095    
2096    <d:item name="hashref:syntax error"
2097        modules="ContentChecker::HTML">
2098      <d:message xml:lang="en">A hash−name reference must start with a
2099      <code>#</code> character.</d:message>
2100    </d:item>
2101    
2102    <d:item name="id ne name"
2103        modules="ContentChecker::HTML">
2104      <d:message xml:lang="en">The <code>id</code> attribute value is
2105      different from the <code>name</code> attribute value.</d:message>
2106    </d:item>
2107    
2108    <d:item name="integer:syntax error"
2109        modules="ContentChecker::HTML">
2110      <d:message xml:lang="en">The attribute value is not an integer.</d:message>
2111    </d:item>
2112    
2113    <d:item name="link type:bad context"
2114        modules="ContentChecker::HTML">
2115      <d:message xml:lang="en">The link type <code><var>{value}</var></code>
2116      cannot be specified for this element.</d:message>
2117      <d:desc xml:lang="en">
2118        <p>The specified link type cannot be used for the element.
2119        The document is non-conforming.</p>
2120    
2121        <p>Link types are associated with limited set of elements.
2122        They cannot be used with other elements.</p>
2123    
2124        <p>For example, link type <code>bookmark</code>
2125        can be used with <code>a</code> or <code>area</code> element,
2126        while it cannot be used with <code>link</code> element.</p>
2127      </d:desc>
2128    </d:item>
2129    
2130    <d:item name="invalid attribute value"
2131        class="attribute-value-error"
2132        modules="ContentChecker::XML ContentChecker::HTML ContentChecker::Atom">
2133      <d:message xml:lang="en">Attribute value <code><var>{@}</var></code>
2134      is not an allowed value.</d:message>
2135    </d:item>
2136    
2137    <d:item name="length:syntax error"
2138        modules="ContentChecker::HTML">
2139      <d:message xml:lang="en">The attribute value is not a length
2140      value.</d:message>
2141    </d:item>
2142    
2143    <d:item name="link type:non-conforming"
2144        modules="ContentChecker::HTML">
2145      <d:message xml:lang="en">The link type <code><var>{value}</var></code>
2146      is non-conforming.</d:message>
2147      <d:desc xml:lang="en">
2148        <p>The specified link type is non-conforming, and therefore
2149        the document is non-conforming.</p>
2150    
2151        <dl class="switch">
2152        <dt>Link type <code>contents</code></dt>
2153          <dd>Use link type <code>index</code>.</dd>
2154        <dt>Link type <code>copyright</code></dt>
2155          <dd>Use link type <code>license</code>.</dd>
2156        <dt>Link type <code>home</code></dt>
2157          <dd>Use link type <code>index</code>.</dd>
2158        <dt>Link type <code>previous</code></dt>
2159          <dd>Use link type <code>prev</code>.</dd>
2160        <dt>Link type <code>start</code></dt>
2161          <dd>Use link type <code>first</code>.</dd>
2162        <dt>Link type <code>toc</code> or <code>top</code></dt>
2163          <dd>Use link type <code>index</code>.</dd>
2164        </dl>
2165      </d:desc>
2166    </d:item>
2167    
2168    <d:item name="meta content-type syntax error"
2169        modules="ContentChecker::HTML">
2170      <d:message xml:lang="en">The specified value is not a valid as a long
2171      character encoding declaration.</d:message>
2172    </d:item>
2173    
2174    <d:item name="mismatched charset name"
2175        modules="ContentChecker::HTML">
2176      <d:message xml:lang="en">The specified character encoding name
2177      <code><var>{value}</var></code> is different from the actual document
2178      character encoding <code><var>{text}</var></code>.</d:message>
2179      <d:desc xml:lang="en">
2180        <p>The specified character encoding name is different from
2181        the character encoding of the document.  The document
2182        is non‐conforming.</p>
2183      </d:desc>
2184    </d:item>
2185    
2186    <d:item name="mismatched charset name not checked"
2187        mopdules="ContentChecker::HTML">
2188      <d:message xml:lang="en">Whether the specified character encoding name
2189      <code><var>{value}</var></code> matches to the actual character encoding
2190      name cannot be checked since the input is not a byte stream.</d:message>
2191    </d:item>
2192    
2193    <d:item name="mode:syntax error"
2194        modules="ContentChecker::HTML">
2195      <d:message xml:lang="en">The attribute value is not a valid mode
2196      name.</d:message>
2197    </d:item>
2198    
2199    <d:item name="nninteger:out of range"
2200        modules="ContentChecker::HTML">
2201      <d:message xml:lang="en">The specified value is out of range.</d:message>
2202    </d:item>
2203    
2204    <d:item name="nninteger:syntax error"
2205        modules="ContentChecker::HTML">
2206      <d:message xml:lang="en">The attribute value is not a non‐negative
2207      integer.</d:message>
2208    </d:item>
2209    
2210    <d:item name="no referenced map"
2211        modules="ContentChecker">
2212      <d:message xml:lang="en">The <code>usemap</code> attribute references
2213      no image map.</d:message>
2214    </d:item>
2215    
2216    <d:item name="no referenced menu"
2217        modules="ContentChecker">
2218      <d:message xml:lang="en">The <code>contextmenu</code> attribute references
2219      no menu.</d:message>
2220    </d:item>
2221    
2222    <d:item name="no referenced header cell"
2223        modules="ContentChecker">
2224      <d:message xml:lang="en">There is no table header cell whose <code>id</code>
2225      is <code><var>{value}</var></code> in the same table.</d:message>
2226    </d:item>
2227    
2228    <d:item name="refresh:syntax error"
2229        modules="ContentChecker::HTML">
2230      <d:message xml:lang="en">the specified value is not a valid as part
2231      of a <code>Refresh</code> pragma.</d:message>
2232    </d:item>
2233    
2234    <d:item name="repeat:syntax error"
2235        modules="ContentChecker::HTML">
2236      <d:message xml:lang="en">The attribute value is not an integer or
2237      a string <code>template</code>.</d:message>
2238    </d:item>
2239    
2240    <d:item name="reserved browsing context name"
2241        class="attribute-value-error">
2242      <d:message xml:lang="en">Browsing context name
2243      <code><var>{@}</var></code> is reserved.</d:message>
2244      <d:desc xml:lang="en">
2245        <p>The specified browsing context name is reserved.
2246        The document is non-conforming.</p>
2247    
2248        <p>Names of browsing contexts starting with <code>_</code>
2249        (<code>U+005F</code> <code class="charname">LOW LINE</code>)
2250        are reserved so that it must not be used.</p>
2251    
2252        <p>Old version of HTML, non-HTML markup languages, and
2253        Web browsers define or implements special reserved
2254        browsing context names <code>_blank</code>,
2255        <code>_main</code>, and <code>_replace</code>.
2256        However, they are <em>not</em> conforming attribute values.</p>
2257      </d:desc>
2258    </d:item>
2259    
2260    <d:item name="Reserved Prefixes and Namespace Names:Name"
2261        modules="ContentChecker::XML">
2262      <d:message xml:lang="en">Namespace name <code><var>{text}</var></code>
2263      is reserved and cannot be used for an arbitrary prefix.</d:message>
2264    </d:item>
2265    
2266    <d:item name="Reserved Prefixes and Namespace Names:Prefix"
2267        modules="ContentChecker::XML">
2268      <d:message xml:lang="en">Namespace prefix <code><var>{text}</var></code>
2269      is reserved and cannot be used for an arbitrary namespace name.</d:message>
2270    </d:item>
2271    
2272    <d:item name="link type:proposed"
2273        modules="ContentChecker::HTML">
2274      <d:message xml:lang="en">Link type <code><var>{value}</var></code>
2275      is proposed but not accepted yet; it <em>should not</em> be
2276      used until it has been accepted.</d:message>
2277      <d:desc>
2278        <p>The link type is in the <i>proposed</i> status; it
2279        <em>should not</em> be used until it has been
2280        accepted.</p>
2281    
2282        <p><strong>Warning</strong>: The data served to the
2283        conforming checker might be out of date; it might have already
2284        been accepted or rejected.  The document might or might not be
2285        conforming depending on the status.  See WHATWG Wiki
2286        for the latest information.</p>
2287      </d:desc>
2288    </d:item>
2289    
2290    <d:item name="sizes:syntax error"
2291        modules="ContentChecker::HTML">
2292      <d:message xml:lang="en">The specified value <code><var>{value}</var></code>
2293      is not a valid value.</d:message>
2294    </d:item>
2295    
2296    <d:item name="space in ID"
2297        modules="ContentChecker::HTML">
2298      <d:message xml:lang="en">White space characters are not allowed
2299      in the <code>id</code> attribute.</d:message>
2300    </d:item>
2301    
2302    <d:item name="template:not template"
2303        modules="ContentChecker ContentChecker::HTML">
2304      <d:message xml:lang="en">The node referenced by the <code>template</code>
2305      attribute is not a template.</d:message>
2306    </d:item>
2307    
2308    <d:item name="window name:empty"
2309        modules="ContentChecker::HTML">
2310      <d:message xml:lang="en">Browsing context name must not be empty.</d:message>
2311    </d:item>
2312    
2313    <d:item name="window name:reserved"
2314        modules="ContentChecker::HTML">
2315      <d:message xml:lang="en">Browsing context name
2316      <code><var>{value}</var></code> is reserved.</d:message>
2317    </d:item>
2318    
2319    <d:item name="word not allowed"
2320        modules="ContentChecker::HTML">
2321      <d:message xml:lang="en">The word <code><var>{value}</var></code> is not
2322      allowed in this attribute.</d:message>
2323    </d:item>
2324    
2325    <d:item name="XML 1.0 NCName:syntax error"
2326        modules="RDFXML">
2327      <d:message xml:lang="en">The specified value is not a legal XML Namespaces
2328      1.0 <code>NCName</code>.</d:message>
2329    </d:item>
2330    
2331    </section>
2332    
2333    <section id="table-model-errors">
2334    <h2>Table Model Errors</h2>
2335    
2336    <d:item name="cell overlapping"
2337        modules="HTML::Table">
2338      <d:message xml:lang="en">Cell slot (<var>{text}</var>) is filled by
2339      multiple cells.</d:message>
2340    </d:item>
2341    
2342    <d:item name="colspan creates column with no anchored cell"
2343        modules="HTML::Table">
2344      <d:message xml:lang="en">This <code>colspan</code> attribute
2345      results in creating a table column that does not contain
2346      any cell anchored to it.</d:message>
2347    </d:item>
2348    
2349    <d:item name="column with no anchored cell"
2350        modules="HTML::Table">
2351      <d:message xml:lang="en">This column has no anchored cell.</d:message>
2352    </d:item>
2353    
2354    <d:item name="table:no cell in last row"
2355        class="table-model-error">
2356      <d:message xml:lang="en">The table has no cell (<code>td</code> or
2357      <code>th</code>) in the last row.</d:message>
2358    </d:item>
2359    
2360    <d:item name="table:rowspan extends table"
2361        class="table-model-error">
2362      <d:message xml:lang="en">This <code>rowspan</code> attribute
2363      results in creating a table row that does not contain
2364      any cell anchored to it.</d:message>
2365      <d:desc xml:lang="en">
2366        <p>The <code>rowspan</code> attribute value of the cell
2367        is so specified that it extends a table in the row axis.
2368        However, the extended row does not contain any cell by itself.
2369        The document is non-conforming.</p>
2370    
2371        <p>For example, the table below is non-conforming:
2372          <pre class="html bad example"><code>&lt;table>
2373    &lt;tbody>
2374    &lt;tr>&lt;td rowspan=2>&lt;/td>&lt;/tr>
2375    &lt;/tbody>
2376    &lt;/table></code></pre>
2377        ... since the second row contains only
2378        a cell that spans between first and second rows.</p>
2379      </d:desc>
2380    </d:item>
2381    
2382    <d:item name="row with no anchored cell"
2383        modules="HTML::Table">
2384      <d:message xml:lang="en">This row has no anchored cell.</d:message>
2385    </d:item>
2386    
2387    <d:item name="rowspan creates row with no anchored cell"
2388        modules="HTML::Table">
2389      <d:message xml:lang="en">This <code>rowspan</code> attribute
2390      results in creating a table row that does not contain
2391      any cell anchored to it.</d:message>
2392    </d:item>
2393    
2394    
2395    </section>
2396    
2397    <section id="imt-warnings">
2398    <h2>Internet Media Type Errors</h2>
2399    
2400    <d:item name="boundary:syntax error"
2401        modules="IMTChecker">
2402      <d:message xml:lang="en">The specified value is not a valid value
2403      as a multipart boundary.</d:message>
2404    </d:item>
2405    
2406    <d:item name="e4x:syntax error"
2407        modules="IMTChecker">
2408      <d:message xml:lang="en">The specified value is not a valid value
2409      for the attribute <code>e4x</code>.</d:message>
2410    </d:item>
2411    
2412    <d:item name="IMT:attribute syntax error"
2413        modules="IMTChecker">
2414      <d:message xml:lang="en">The specified value,
2415      <code><var>{value}</var></code>, is syntactically not a valid
2416      attribute name.</d:message>
2417    </d:item>
2418    
2419    <d:item name="IMT:composite"
2420        modules="ContentChecker::Atom">
2421      <d:message xml:lang="en">The specified media type is a composite
2422      type, which is not allowed in this context.</d:message>
2423    </d:item>
2424    
2425    <d:item name="IMT:limited use subtype"
2426        modules="IMTChecker">
2427      <d:message xml:lang="en">An Internet Media Type whose intended usage
2428      is limited use, <code><var>{value}</var></code> is used.</d:message>
2429    </d:item>
2430    
2431    <d:item name="IMT:syntax error"
2432        modules="ContentChecker::HTML ContentChecker::Atom">
2433      <d:message xml:lang="en">The specified value is not an Internet Media
2434      Type.</d:message>
2435    </d:item>
2436    
2437    <d:item name="IMT:obsolete parameter"
2438        modules="IMTChecker">
2439      <d:message xml:lang="en">An obsolete parameter
2440      <code><var>{value}</var></code> is used.</d:message>
2441    </d:item>
2442    
2443    <d:item name="IMT:obsolete subtype"
2444        modules="IMTChecker">
2445      <d:message xml:lang="en">An obsolete Internet Media Type
2446      <code><var>{value}</var></code> is used.</d:message>
2447      <d:item xml:lang="en">
2448        <p>The specified Internet Media Type is registered with status
2449        of <i>OBSOLETE</i>.</p>
2450        
2451        <dl class="swtich">
2452        <dt>Media type <code>text/ecmascript</code></dt>
2453          <dd>Media type <code>text/ecmascript</code> is obsoleted in
2454          favor of <code>application/ecmascript</code>.  Note that
2455          <code>text/javascript</code> would be better alternative
2456          for many cases.</dd>
2457        <dt>Media type <code>text/javascript</code></dt>
2458          <dd>Media type <code>text/javascript</code> is obsoleted by
2459          <abbr>IETF</abbr> with backward incompatible alternate
2460          <code>application/javascript</code> for architectural
2461          purity.<!-- @@ ref? -->  Realist may ignore this warning.</dd>
2462        </dl>
2463      </d:item>
2464    </d:item>
2465    
2466    <d:item name="IMT:parameter missing"
2467        modules="IMTChecker">
2468      <d:message xml:lang="en">Parameter <code><var>{text}</var></code> have to
2469      be specified for the Internet Media Type
2470      <code><var>{value}</var></code>.</d:message>
2471    </d:item>
2472    
2473    <d:item name="IMT:parameter not allowed"
2474        modules="IMTChecker">
2475      <d:message xml:lang="en">Parameter <code><var>{value}</var></code> is not
2476      allowed for this Internet Media Type.</d:message>
2477    </d:item>
2478    
2479    <d:item name="IMT:private subtype"
2480        modules="IMTChecker">
2481      <d:message xml:lang="en">Use of a private Internet Media Type
2482      <code><var>{value}</var></code> is not encouraged.</d:message>
2483    </d:item>
2484    
2485    <d:item name="IMT:private type"
2486        modules="IMTChecker">
2487      <d:message xml:lang="en">Use of a private type
2488      <code><var>{value}</var></code> is not encouraged.</d:message>
2489    </d:item>
2490    
2491    <d:item name="IMT:subtype syntax error"
2492        modules="IMTChecker">
2493      <d:message xml:lang="en">Value <code><var>{value}</var></code> is
2494      syntactically not a valid subtype value of an Internet Media Type.</d:message>
2495    </d:item>
2496    
2497    <d:item name="IMT:type syntax error"
2498        modules="IMTChecker">
2499      <d:message xml:lang="en">Value <code><var>{value}</var></code> is
2500      syntactically not a valid type.</d:message>
2501    </d:item>
2502    
2503    <d:item name="IMT:unknown parameter"
2504        modules="IMTChecker">
2505      <d:message xml:lang="en">An unknown parameter <code><var>{value}</var></code>
2506      is used.  The conformance checker cannot determine whether use of this
2507      parameter is valid or not.</d:message>
2508    </d:item>
2509    
2510    <d:item name="IMT:unknown subtype"
2511        modules="IMTChecker">
2512      <d:message xml:lang="en">An unknown Internet Media Type
2513      <code><var>{value}</var></code> is used.  At the time of the update of
2514      the conformance checker's Internet Media Type database, the subtype is
2515      not reigstered to the IANA registry.  The subtype, however, might be
2516      registerd to the IANA registry thereafter.  Please consult the IANA
2517      registry.</d:message>
2518    </d:item>
2519    
2520    <d:item name="IMT:unregistered subtype"
2521        modules="IMTChecker">
2522      <d:message xml:lang="en">Use of an Internet Media Type
2523      <code><var>{value}</var></code> is not encouraged since it is not
2524      part of the IANA registry.</d:message>
2525    </d:item>
2526    
2527    <d:item name="IMT:unregistered type"
2528        modules="IMTChecker">
2529      <d:message xml:lang="en">Use of a type
2530      <code><var>{value}</var></code> is not encouraged since it is not
2531      a standardized type.</d:message>
2532    </d:item>
2533    
2534    <d:item name="not IMT"
2535        modules="ContentChecker::Atom">
2536      <d:message xml:lang="en">A value that is not an Internet Media Type
2537      is not allowed here.</d:message>
2538    </d:item>
2539    
2540    </section>
2541    
2542    <section id="uri-errors">
2543    <h2>URL Errors</h2>
2544    
2545    <d:item name="syntax error:iri3987"
2546        modules="URIChecker CacheManifest">
2547      <d:message xml:lang="en">The specified value is syntactically not an
2548      IRI.</d:message>
2549    </d:item>
2550    
2551    <d:item name="syntax error:iriref3987"
2552        modules="URIChecker">
2553      <d:message xml:lang="en">The specified value is syntactically not an IRI
2554      reference.</d:message>
2555      <d:desc xml:lang="en">
2556        <p>The specified value does not satisfy the syntactical requirements
2557        for IRI references.  The document is non-conforming.</p>
2558    
2559        <p>Possible causes:
2560          <ul>
2561          <li>The string might contain one or more white space characters.
2562          Especially, the <code> </code> (<code>U+0020</code>
2563          <code class="charname">SPACE</code>) character cannot be
2564          used in IRI references.</li>
2565          </ul>
2566        </p>
2567      </d:desc>
2568    </d:item>
2569    
2570    <d:item name="syntax error:rdfuriref"
2571        modules="URIChecker">
2572      <d:message xml:lang="en">The specified value is syntactically not an RDF
2573      URI reference.</d:message>
2574    </d:item>
2575    
2576    <d:item name="syntax error:uri2396"
2577        modules="URIChecker">
2578      <d:message xml:lang="en">The specified value is syntactically not a
2579      URI according to RFC 2396.</d:message>
2580    </d:item>
2581    
2582    <d:item name="syntax error:uri3986"
2583        modules="URIChecker">
2584      <d:message xml:lang="en">The specified value is syntactically not a
2585      URI.</d:message>
2586    </d:item>
2587    
2588    <d:item name="URL:address format"
2589        modules="URIChecker">
2590      <d:message xml:lang="en">URL host address format
2591      <code><var>{value}</var></code> is not supported by the
2592      conformance checker.</d:message>
2593    </d:item>
2594    
2595    <d:item name="URL:default port"
2596        modules="URIChecker">
2597      <d:message xml:lang="en">Default port number should be omitted.</d:message>
2598    </d:item>
2599    
2600    <d:item name="URL:dot-segment"
2601        modules="URIChecker">
2602      <d:message xml:lang="en">A dot-segment (<code>.</code> or
2603      <code>..</code>) occurs in an absolute reference.</d:message>
2604      <d:desc>
2605        <p>Dot-segment (<code>.</code> or <code>..</code>) should
2606        not occur in an absolute reference.</p>
2607    
2608        <p>In relative references, dot-segments are used to represent
2609        the current (<code>.</code>) or the parent (<code>..</code>)
2610        hierarchy of the path.  Though they are also allowed
2611        in absolute references, it should be resolved to the
2612        canonical form before it has been published.</p>
2613      </d:desc>
2614    </d:item>
2615    
2616    <d:item name="URL:empty host"
2617        modules="URIChecker">
2618      <d:message xml:lang="en">The host component of the URL is empty.</d:message>
2619    </d:item>
2620    
2621    <d:item name="URL:empty path"
2622        modules="URIChecker">
2623      <d:message xml:lang="en">The URL does not end with
2624      a <code>/</code> character.</d:message>
2625      <d:item xml:lang="en">
2626        <p>The IRI does not end with a <code>/</code>.  If there is an
2627        authority component in an IRI, a <code>/</code> should be present
2628        instead of empty path component.</p>
2629    
2630        <p>For example, <code>http://www.example.com<strong>/</strong></code>
2631        is preferred to <code>http://www.example.com</code>.</p>
2632      </d:item>
2633    </d:item>
2634    
2635    <d:item name="URL:empty port"
2636        modules="URIChecker">
2637      <d:message xml:lang="en">The port component of the URL is empty.</d:message>
2638    </d:item>
2639    
2640    <d:item name="URL fragment not allowed"
2641        modules="CacheManifest">
2642      <d:message xml:lang="en">The fragment component of the URL is not
2643      allowed.</d:message>
2644    </d:item>
2645    
2646    <d:item name="URL:long host"
2647        modules="URIChecker">
2648      <d:message xml:lang="en">The host component of the URL
2649      is too long.</d:message>
2650    </d:item>
2651    
2652    <d:item name="URL:lowercase hexadecimal digit"
2653        modules="URIChecker">
2654      <d:message xml:lang="en">A lowercase hexadecimal digit is used
2655      in percent-encoding.</d:message>
2656      <d:desc xml:lang="en">
2657        <p>The hexadecimal digit in percent-encoding string in the IRI
2658        is in lowercase.  Though the IRI <em>is</em> conforming,
2659        it should be in uppercase.</p>
2660      </d:desc>
2661    </d:item>
2662    
2663    <d:item name="URL:non-DNS host"
2664        modules="URIChecker">
2665      <d:message xml:lang="en">The host component of the URL
2666      is not a DNS host name.</d:message>
2667    </d:item>
2668    
2669    <d:item name="URL:non UTF-8 host"
2670        modules="URIChecker">
2671      <d:message xml:lang="en">The host component of the URL
2672      is not encoded in UTF-8.</d:message>
2673    </d:item>
2674    
2675    <d:item name="URL:password"
2676        modules="URIChecker">
2677      <d:message xml:lang="en">Password should not be included in a URL
2678      for the security.</d:message>
2679    </d:item>
2680    
2681    <d:item name="URL:percent-encoded unreserved"
2682        modules="URIChecker">
2683      <d:message xml:lang="en">An unreserved character is
2684      percent-encoded.</d:message>
2685      <d:desc xml:lang="en">
2686        <p>An unreserved character is percent-encoded in the IRI.
2687        Though it <em>is</em> conforming, it should be in the
2688        decoded (or bare) form.</p>
2689      </d:desc>
2690    </d:item>
2691    
2692    <d:item name="URL:uppercase host"
2693        modules="URIChecker">
2694      <d:message xml:lang="en">The host <code><var>{value}</var></code>
2695      should be spelt in lowercase.</d:message>
2696    </d:item>
2697    
2698    <d:item name="URL:uppercase scheme name"
2699        modules="URIChecker">
2700      <d:message xml:lang="en">URL scheme name is in uppercase.</d:message>
2701      <d:desc xml:lang="en">
2702        <p>The scheme part of the IRI is written in uppercase letter.</p>
2703    
2704        <p>Uppercase scheme names are not required to be processed
2705        correctly.</p>
2706    <!-- @@
2707     RFC 3986 3.1.
2708     > Although schemes are case-
2709       insensitive, the canonical form is lowercase and documents that
2710       specify schemes must do so with lowercase letters.
2711    
2712     > An implementation ... should only produce lowercase scheme names for
2713       consistency.
2714    -->
2715      </d:desc>
2716    </d:item>
2717    
2718    </section>
2719    
2720    <section id="mq-errors">
2721    <h2>Media Query Errors</h2>
2722    
2723    <d:item name="mq syntax error"
2724        modules="CSS::MediaQueryParser">
2725      <d:message xml:lang="en">The specified value has a syntax error as a
2726      media query.</d:message>
2727    </d:item>
2728    
2729    <d:item name="unknown media type"
2730        modules="CSS::MediaQueryParser">
2731      <d:message xml:lang="en">Media type <code><var>{value}</var></code> is
2732      not supported by the conformance checker.</d:message>
2733    </d:item>
2734    
2735    </section>
2736    
2737    <section id="selectors-errors">
2738    <h2>Selectors Errors</h2>
2739    
2740    <d:item name="an+b not closed"
2741        modules="CSS::SelectorsParser">
2742      <d:message xml:lang="en">Argument list of the pseudo-class is
2743      not closed by a <code>)</code> character.</d:message>
2744    </d:item>
2745    
2746    <d:item name="ab+b not integer"
2747        modules="CSS::SelectorsParser">
2748      <d:message xml:lang="en">Numbers in the argument
2749      <code><var>a</var>n+<var>b</var></code> have to be integers.</d:message>
2750    </d:item>
2751    
2752    <d:item name="an+b syntax error"
2753        modules="CSS::SelectorsParser">
2754      <d:message xml:lang="en">Argument <code><var>a</var>n+<var>b</var></code> is
2755      syntactically incorrect.</d:message>
2756    </d:item>
2757    
2758    <d:item name="attr selector not closed"
2759        modules="CSS::SelectorsParser">
2760      <d:message xml:lang="en">Attribute selector is not closed by
2761      a <code>]</code> character.</d:message>
2762    </d:item>
2763    
2764    <d:item name="lang selector not closed"
2765        modules="CSS::SelectorsParser">
2766      <d:message xml:lang="en">Argument list of the <code>:lang</code>
2767      selector is not closed by a <code>)</code> character.</d:message>
2768    </d:item>
2769    
2770    <d:item name="namespace prefix:not declared"
2771        modules="CSS::SelectorsParser">
2772      <d:message xml:lang="en">Namespace prefix <code><var>{value}</var></code>
2773      is not declared.</d:message>
2774    </d:item>
2775    
2776    <d:item name="no attr local name"
2777        modules="CSS::SelectorsParser">
2778      <d:message xml:lang="en">Attribute local name is missing.</d:message>
2779    </d:item>
2780    
2781    <d:item name="no attr match"
2782        modules="CSS::SelectorsParser">
2783      <d:message xml:lang="en">Attribute matching operator (e.g.
2784      <code>=</code>) is missing.</d:message>
2785    </d:item>
2786    
2787    <d:item name="no attr name"
2788        modules="CSS::SelectorsParser">
2789      <d:message xml:lang="en">Attribute name is missing.</d:message>
2790    </d:item>
2791    
2792    <d:item name="no attr namespace separator"
2793        modules="CSS::SelectorsParser">
2794      <d:message xml:lang="en">Attribute namespace wildcard <code>*</code>
2795      is not followed by a <code>|</code> character.</d:message>
2796    </d:item>
2797    
2798    <d:item name="no attr value"
2799        modules="CSS::SelectorsParser">
2800      <d:message xml:lang="en">Attribute value is missing.</d:message>
2801    </d:item>
2802    
2803    <d:item name="no class name selector"
2804        modules="CSS::SelectorsParser">
2805      <d:message xml:lang="en">Class name is missing.</d:message>
2806      <!-- "." not followed by a class name -->
2807    </d:item>
2808    
2809    <d:item name="no combinator"
2810        modules="CSS::SelectorsParser">
2811      <d:message xml:lang="en">Combinator is missing.</d:message>
2812    </d:item>
2813    
2814    <d:item name="no contains string"
2815        modules="CSS::SelectorsParser">
2816      <d:message xml:lang="en">No string is specified in the argument
2817      list of the <code>:-manakai-contains</code> pseudo-class
2818      selector.</d:message>
2819    </d:item>
2820    
2821    <d:item name="no lang tag"
2822        modules="CSS::SelectorsParser">
2823      <d:message xml:lang="en">Language tag argument is missing.</d:message>
2824    </d:item>
2825    
2826    <d:item name="no local name selector"
2827        modules="CSS::SelectorsParser">
2828      <d:message xml:lang="en">Local name part of the type selector (or
2829      <code>*</code> for the universal selector) is missing.</d:message>
2830      <!-- "|" not followed by a name or "*" -->
2831    </d:item>
2832    
2833    <d:item name="no pseudo-class name"
2834        modules="CSS::SelectorsParser">
2835      <d:message xml:lang="en">Pseudo-class name is missing.</d:message>
2836    </d:item>
2837    
2838    <d:item name="no pseudo-element name"
2839        modules="CSS::SelectorsParser">
2840      <d:message xml:lang="en">Pseudo-element name is missing.</d:message>
2841    </d:item>
2842    
2843    <d:item name="no sss"
2844        modules="CSS::SelectorsParser">
2845      <d:message xml:lang="en">Sequence of simple selectors is
2846      expected.</d:message>
2847    </d:item>
2848    
2849    <d:item name="not not closed"
2850        modules="CSS::SelectorsParser">
2851      <d:message xml:lang="en">Argument list of the <code>:not</code> selector
2852      is not closed by a <code>)</code> character.</d:message>
2853    </d:item>
2854    
2855    <d:item name="ss after pseudo-element"
2856        modules="CSS::SelectorsParser">
2857      <d:message xml:lang="en">Simple selector is not allowed after a
2858      pseudo element.</d:message>
2859    </d:item>
2860    
2861    <d:item name="unknown pseudo-class"
2862        modules="CSS::SelectorsParser">
2863      <d:message xml:lang="en">Pseudo-class <code>:<var>{value}</var></code>
2864      is not supported by the conformance checker.</d:message>
2865    </d:item>
2866    
2867    <d:item name="unknown pseudo-element"
2868        modules="CSS::SelectorsParser">
2869      <d:message xml:lang="en">Pseudo-element <code>::<var>{value}</var></code>
2870      is not supported by the conformance checker.</d:message>
2871    </d:item>
2872    
2873    </section>
2874    
2875    <section id="css-errors">
2876    <h2>CSS Errors</h2>
2877    
2878    <d:item name="at-rule not allowed"
2879        modules="CSS::Parser">
2880      <d:message xml:lang="en">An <code>@<var>{text}</var></code> rule is not
2881      allowed here.</d:message>
2882    </d:item>
2883    
2884    <d:item name="at-rule syntax error"
2885        modules="CSS::Parser">
2886      <d:message xml:lang="en">The <code>@<var>{text}</var></code> rule is
2887      syntactically incorrect.</d:message>
2888    </d:item>
2889    
2890    <d:item name="block not closed"
2891        modules="CSS::Parser">
2892      <d:message xml:lang="en">Block is not closed before the end of
2893      file.</d:message>
2894    </d:item>
2895    
2896    <d:item name="CSS duplication"
2897        modules="CSS::Parser">
2898      <d:message xml:lang="en">Component <code>&lt;<var>{text}</var>></code> is
2899      already specified.</d:message>
2900    </d:item>
2901    
2902    <d:item name="CSS cursor hand"
2903        modules="CSS::Parser">
2904      <d:message xml:lang="en">Value <code>hand</code> is not valid as
2905      <code>&lt;'cursor'></code>.</d:message>
2906    </d:item>
2907    
2908    <d:item name="CSS syntax error"
2909        modules="CSS::Parser">
2910      <d:message xml:lang="en">Specified value is syntactically not a correct
2911      <code>&lt;<var>{text}</var>></code>.</d:message>
2912    </d:item>
2913    
2914    <d:item name="no declaration block"
2915        modules="CSS::Parser">
2916      <d:message xml:lang="en">No declaration block is found after a group of
2917      selectors.</d:message>
2918    </d:item>
2919    
2920    <d:item name="no property colon"
2921        modules="CSS::Parser">
2922      <d:message xml:lang="en">A <code>:</code> character is missing after
2923      a property name.</d:message>
2924    </d:item>
2925    
2926    <d:item name="no property name"
2927       modules="CSS::Parser">
2928      <d:message xml:lang="en">Property name is expected.</d:message>
2929    </d:item>
2930    
2931    <d:item name="no property semicolon"
2932       modules="CSS::Parser">
2933      <d:message xml:lang="en">A <code>;</code> character is missing at the
2934      end of the property.</d:message>
2935    </d:item>
2936    
2937    <d:item name="priority syntax error"
2938        modules="CSS::Parser">
2939      <d:message xml:lang="en">Priority part of the declaration is syntactically
2940      incorrect.</d:message>
2941    </d:item>
2942    
2943    <d:item name="unknown at-rule"
2944        modules="CSS::Parser">
2945      <d:message xml:lang="en">The <code>@<var>{value}</var></code> rule is
2946      not supported by the conformance checker.</d:message>
2947    </d:item>
2948    
2949    <d:item name="unknown property"
2950        modules="CSS::Parser">
2951      <d:message xml:lang="en">Property <code><var>{value}</var></code> is
2952      not supported by the conformance checker.</d:message>
2953    </d:item>
2954    
2955    </section>
2956    
2957    <section id="cache-manifest-errors">
2958    <h2>Cache Manifest Errors</h2>
2959    
2960    <d:item name="both in entries and whitelist"
2961        modules="CacheManifest">
2962      <d:message xml:lang="en">This URL is found both in the explicit or
2963      fallback entries and in the online whitelist.</d:message>
2964    </d:item>
2965    
2966    <d:item name="different origin from manifest"
2967        modules="CacheManifest">
2968      <d:message xml:lang="en">The specified URL has different origin from
2969      the manifest.</d:message>
2970    </d:item>
2971    
2972    <d:item name="different scheme from manifest"
2973        modules="CacheManifest">
2974      <d:message xml:lang="en">The scheme component of the URL is
2975      different from that of the manifest URL.  The URL is ignored.</d:message>
2976    </d:item>
2977    
2978    <d:item name="duplicate oc namespace"
2979        modules="CacheManifest">
2980      <d:message xml:lang="en">This oppotunistic caching namespace is already
2981      specified.</d:message>
2982    </d:item>
2983    
2984    <d:item name="no fallback entry URL"
2985        modules="CacheManifest">
2986      <d:message xml:lang="en">Fallback entry URL is missing.</d:message>
2987    </d:item>
2988    
2989    <d:item name="not manifest"
2990        modules="CacheManifest">
2991      <d:message xml:lang="en">This document is not a cache manifest.</d:message>
2992      <d:desc xml:lang="en">
2993        <p>The specified document is <em>not</em> a cache manifest.
2994        The document is non-conforming.</p>
2995    
2996        <p>An entity labeled as Internet media type
2997        <code>text/cache-manifest</code> must contain a cache manifest.</p>
2998    
2999        <p>A cache manifest must start with a line whose content is
3000        <code class="manifest example">CACHE MANIFEST</code>
3001        (exactly one space character between
3002        <code>CACHE</code> and <code>MANIFEST</code>).</p>
3003      </d:desc>
3004    </d:item>
3005    
3006    <d:item name="same as manifest URL"
3007        modules="CacheManifest">
3008      <d:message xml:lang="en">This URL is same as the manifest URL.</d:message>
3009    </d:item>
3010    
3011    </section>
3012    
3013    <section id="information">
3014    <h2>Stability Information</h2>
3015    
3016    <d:item name="deprecated:attr"
3017        modules="ContentChecker">
3018      <d:message xml:lang="en">This attribute is deprecated.</d:message>
3019    </d:item>
3020    
3021    <d:item name="deprecated:element"
3022        modules="ContentChecker">
3023      <d:message xml:lang="en">This element is deprecated.</d:message>
3024    </d:item>
3025    
3026    <d:item name="status:cr:element"
3027        modules="ContentChecker">
3028      <d:message xml:lang="en">This element is in the
3029      <strong>call for implementation</strong> stage.</d:message>
3030      <d:desc xml:lang="en">
3031        <p>The element is in the call for implementation stage.</p>
3032        
3033        <p>Usually, using the element is safe.  However, it is a new feature
3034        so that it might not be implemented correctly.  If it is found that
3035        the feature is hard or impossible to implement, the feature
3036        might be revised, or in some case it might be dropped.</p>
3037    
3038        <p>Elements defined by Atom 1.0 (IETF Proposed Standard), and XBL 2.0
3039        (W3C Candidate Recommendation) belong to this class.</p>
3040      </d:desc>
3041    </d:item>
3042    
3043    <d:item name="status:lc:element"
3044        modules="ContentChecker">
3045      <d:message xml:lang="en">This element is in the <strong>last
3046      call for comments</strong> stage.</d:message>
3047      <d:desc xml:lang="en">
3048        <p>The element is in the last call for comments stage.</p>
3049        
3050        <p>The element is relatively mature, though the standardization
3051        is not done yet.  It may be used for experiments.  Since it is a new
3052        feature, it might not be implemented correctly or at all.  If it is
3053        found that the feature is hard or impossible to implement, the feature
3054        might be revised or might be dropped.</p>
3055    
3056        <p>Elements defined by Web Forms 2.0 as well as some elements
3057        defined by HTML5 belong to this class.</p>
3058      </d:desc>
3059    </d:item>
3060    
3061    <d:item name="status:wd:element"
3062        modules="ContentChecker">
3063      <d:message xml:lang="en">This element is documented in a <strong>working
3064      draft</strong>.</d:message>
3065      <d:desc xml:lang="en">
3066        <p>The element is documented in a working or editor's draft
3067        and not yet completed.</p>
3068        
3069        <p>The element should not be used for any practical purpose.
3070        The feature might be drastically changed later or might be
3071        entirely removed.</p>
3072    
3073        <p>Most of new elements defined by HTML5 belong to this class.</p>
3074      </d:desc>
3075    </d:item>
3076    
3077    <d:item name="status:non-standard:element"
3078        modules="ContentChecker">
3079      <d:message xml:lang="en">This element is <strong>not part of any
3080      standard</strong> the conformance checker knows.</d:message>
3081      <d:desc xml:lang="en">
3082        <p>The element is not part of any standard or draft the conformance
3083        checker is aware of.</p>
3084        
3085        <p>The element should not be used for any practical purpose unless
3086        there is really a standard that defines the element.</p>
3087      </d:desc>
3088    </d:item>
3089    
3090    <d:item name="status:cr:attr"
3091        modules="ContentChecker">
3092      <d:message xml:lang="en">This attribute is in the
3093      <strong>call for implementation</strong> stage.</d:message>
3094      <d:desc xml:lang="en">
3095        <p>The attribute is in the call for implementation stage.</p>
3096        
3097        <p>Usually, using the attribute is safe.  However, it is a new feature
3098        so that it might not be implemented correctly.  If it is found that
3099        the feature is hard or impossible to implement, the feature
3100        might be revised, or in some case it might be dropped.</p>
3101      </d:desc>
3102    </d:item>
3103    
3104    <d:item name="status:lc:attr"
3105        modules="ContentChecker">
3106      <d:message xml:lang="en">This attribute is in the <strong>last
3107      call for comments</strong> stage.</d:message>
3108      <d:desc xml:lang="en">
3109        <p>The attribute is in the last call for comments stage.</p>
3110        
3111        <p>The attribute is relatively mature, though the standardization
3112        is not done yet.  It may be used for experiments.  Since it is a new
3113        feature, it might not be implemented correctly or at all.  If it is
3114        found that the feature is hard or impossible to implement, the feature
3115        might be revised or might be dropped.</p>
3116      </d:desc>
3117    </d:item>
3118    
3119  s:URI::empty path;should;This IRI should explicitly end with <code>/</code>.  <d:item name="status:wd:attr"
3120  m:URI::syntax error;must;This IRI is not syntactically valid.      modules="ContentChecker">
3121      <d:message xml:lang="en">This attribute is documented in a <strong>working
3122      draft</strong>.</d:message>
3123      <d:desc xml:lang="en">
3124        <p>The attribute is documented in a working or editor's draft
3125        and not yet completed.</p>
3126        
3127        <p>The attribute should not be used for any practical purpose.
3128        The feature might be drastically changed later or might be
3129        entirely removed.</p>
3130      </d:desc>
3131    </d:item>
3132    
3133    <d:item name="status:non-standard:attr"
3134        modules="ContentChecker">
3135      <d:message xml:lang="en">This attribute is <strong>not part of any
3136      standard</strong> the conformance checker knows.</d:message>
3137      <d:desc xml:lang="en">
3138        <p>The attribute is not part of any standard or draft the conformance
3139        checker is aware of.</p>
3140        
3141        <p>The attribute should not be used for any practical purpose unless
3142        there is really a standard that defines the attribute.</p>
3143      </d:desc>
3144    </d:item>
3145    </section>
3146    
3147    <section id="langtag-errors">
3148    <h2>Language Tag Errors</h2>
3149    
3150    <d:item name="langtag:extension:duplication"
3151        modules="LangTag">
3152      <d:message xml:lang="en">There is another extension subtag
3153      <code><var>{value}</var></code>.</d:message>
3154    </d:item>
3155    
3156    <d:item name="langtag:illegal"
3157        modules="LangTag">
3158      <d:message xml:lang="en">Subtag <code><var>{value}</var></code> is
3159      syntactically invalid.</d:message>
3160    </d:item>
3161    
3162    <d:item name="langtag:language:case"
3163        modules="LangTag">
3164      <d:message xml:lang="en">It is a good practice to represent ISO 639-1
3165      language code <code><var>{value}</var></code> in lowercase.</d:message>
3166    </d:item>
3167    
3168    <d:item name="langtag:language:mul"
3169        modules="LangTag">
3170      <d:message xml:lang="en">Langauge tag <code>mul</code> should not be
3171      used.</d:message>
3172    </d:item>
3173    
3174    <d:item name="langtag:language:nosemantics"
3175        modules="LangTag">
3176      <d:message xml:lang="en">No semantics is defined for language subtag
3177      <code><var>{value}</var></code>.</d:message>
3178    </d:item>
3179    
3180    <d:item name="langtag:language:syntax"
3181        modules="LangTag">
3182      <d:message xml:lang="en">The language subtag <code><var>{value}</var></code>
3183      is syntactically invalid.</d:message>
3184    </d:item>
3185    
3186    <d:item name="langtag:language:und"
3187        modules="LangTag">
3188      <d:message xml:lang="en">Langauge tag <code>und</code> should not be
3189      used.</d:message>
3190    </d:item>
3191    
3192    <d:item name="langtag:private"
3193        modules="LangTag">
3194      <d:message xml:lang="en">It would be better if a private use language
3195      tag (<code><var>{value}</var></code>) is not used.</d:message>
3196    </d:item>
3197    
3198    <d:item name="langtag:privateuse:syntax"
3199        modules="LangTag">
3200      <d:message xml:lang="en">Private use subtag <code><var>{value}</var></code>
3201      is syntactically invalid.</d:message>
3202    </d:item>
3203    
3204    <d:item name="langtag:region:case"
3205        modules="LangTag">
3206      <d:message xml:lang="en">It is a good practice to represent ISO 3166
3207      country code <code><var>{value}</var></code> in uppercase.</d:message>
3208    </d:item>
3209    
3210    <d:item name="langtag:region:nosemantics"
3211        modules="LangTag">
3212      <d:message xml:lang="en">No semantics is defined for region subtag
3213      <code><var>{value}</var></code>.</d:message>
3214    </d:item>
3215    
3216    <d:item name="langtag:region:private"
3217        modules="LangTag">
3218      <d:message xml:lang="en">Use of private use country code
3219      <code><var>{value}</var></code> is not allowed.</d:message>
3220    </d:item>
3221    
3222    </section>
3223    
3224    <section id="rdfxml-errors">
3225    <h2>RDF/XML Errors</h2>
3226    
3227    <d:item name="bad rdf namespace"
3228        modules="RDFXML">
3229      <d:message xml:lang="en">The namespace URI of an element that
3230      represents an RDF concept must be
3231      <code>http://www.w3.org/1999/02/22-rdf-syntax-ns#</code>.</d:message>
3232    </d:item>
3233    
3234    <d:item name="duplicate rdf id"
3235        modules="RDFXML">
3236      <d:message xml:lang="en">The specified value is already used as an
3237      ID.</d:message>
3238    </d:item>
3239    
3240    <d:item name="duplicate unqualified attr"
3241        modules="RDFXML">
3242      <d:message xml:lang="en">Both unqualified attribute and namespace‐qualified
3243      RDF attribute are specified, which is not allowed.</d:message>
3244    </d:item>
3245    
3246    <d:item name="parse type other"
3247        modules="RDFXML">
3248      <d:message xml:lang="en">An invalid value is specified to
3249      the <code>parseType</code> attribute.</d:message>
3250    </d:item>
3251    
3252    <d:item name="second node element"
3253        modules="RDFXML">
3254      <d:message xml:lang="en">There is another element, such that
3255      this element is not allowed.</d:message>
3256    </d:item>
3257    
3258    <d:item name="unqualified attr"
3259        modules="RDFXML">
3260      <d:message xml:lang="en">Unqualified attribute is not allowed.</d:message>
3261    </d:item>
3262    
3263    <d:item name="unqualified rdf attr"
3264        modules="RDFXML">
3265      <d:message xml:lang="en">RDF attribute should be
3266      namespace‐qualified.</d:message>
3267    </d:item>
3268    
3269  </section>  </section>
3270    
3271  <section id="unsupported-messages">  <section id="unsupported-messages">
3272  <h2><i>Unsupported</i> Messages</h2>  <h2><i>Unsupported</i> Messages</h2>
3273    
3274  <d:item name="unsupported:attribute"  <d:item name="unknown element"
3275      class="unsupported">      modules="ContentChecker">
3276    <d:message xml:lang="en">This attribute is not supported by the    <d:message xml:lang="en">Conformance checking for element
3277    conformance checker; <em>it might or might not be conforming</em>.</d:message>    <code><var>{local-name}</var></code> is not supported; <em>it might or
3278      might not be conforming</em>.</d:message>
3279    <d:desc xml:lang="en">    <d:desc xml:lang="en">
3280      <p>The conformant checker does not support the attribute.      <p>The conformant checker does not support the element.
3281      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
3282    </d:desc>    </d:desc>
3283  </d:item>  </d:item>
3284    
3285  <d:item name="unsupported:element"  <d:item name="unknown attribute"
3286      class="unsupported">      modules="ContentChecker ContentChecker::HTML ContentChecker::Atom">
3287    <d:message xml:lang="en">This element is not supported by the    <d:message xml:lang="en">Conformance checking for attribute
3288    conformance checker; <em>it might or might not be conforming</em>.</d:message>    <code><var>{local-name}</var></code> of element
3289      <code><var>{element-local-name}</var></code> is not supported;
3290      <em>it might or might not be conforming</em>.</d:message>
3291    <d:desc xml:lang="en">    <d:desc xml:lang="en">
3292      <p>The conformant checker does not support the element.      <p>The conformant checker does not support the attribute.
3293      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
3294    </d:desc>    </d:desc>
3295  </d:item>  </d:item>
3296    
3297  <d:item name="unsupported:link type"  <d:item name="unknown link type"
3298      class="unsupported">      modules="ContentChecker::HTML">
3299    <d:message xml:lang="en">The link type <code>$0</code> is not standardized    <d:message xml:lang="en">Link type <code><var>{value}</var></code> is not
3300    or registered at the time of the release of the conformance checker;    standardized or registered at the time of the release of the conformance
3301    <em>it is non-conforming unless it has now been registered</em>.</d:message>    checker; <em>it is non-conforming unless it now has been
3302      registered</em>.</d:message>
3303    <d:desc xml:lang="en">    <d:desc xml:lang="en">
3304      <p>The <code>rel</code> attribute is defined as a list of link types.      <p>The <code>rel</code> attribute is defined as a list of link types.
3305      Some common link types are defined in the HTML5 specification.      Some common link types are defined in the HTML5 specification.
# Line 214  m:URI::syntax error;must;This IRI is not Line 3311  m:URI::syntax error;must;This IRI is not
3311      The link type might have been added to the registry since then.      The link type might have been added to the registry since then.
3312      In such case it might be conforming.  Otherwise, the      In such case it might be conforming.  Otherwise, the
3313      document is non-conforming.</p>      document is non-conforming.</p>
3314    
3315        <dl>
3316        <dt>Link types <code>shortcut icon</code></dt>
3317            <dd>Link type <code>shortcut</code> is not registered.
3318            Use only <code>icon</code> for linking to so-called favicon.</dd>
3319        </dl>
3320      </d:desc>
3321    </d:item>
3322    
3323    <d:item name="event handler"
3324        modules="ContentChecker::HTML">
3325      <d:message xml:lang="en">Conformance checking for event handler attribute
3326      is not supported; <em>it might or might not be conforming.</em></d:message>
3327    </d:item>
3328    
3329    <d:item name="media query"
3330        modules="ContentChecker::HTML">
3331      <d:message xml:lang="en">Conformance checking for media query
3332      is not supported; <em>it might or might not be conforming.</em></d:message>
3333    </d:item>
3334    
3335    <d:item name="addr-spec not supported"
3336        modules="ContentChecker::Atom">
3337      <d:message xml:lang="en">Conformance checking for an <code>addr-spec</code>
3338      is not supported; <em>it might or might not be conforming.</em></d:message>
3339    </d:item>
3340    
3341    <d:item name="XML script lang"
3342        modules="ContentChecker::HTML">
3343      <d:message xml:lang="en">Conformance checking for script
3344      language <code><var>{text}</var></code> is not supported;
3345      <em>it might or might not be conforming.</em></d:message>
3346    </d:item>
3347    
3348    <d:item name="XML style lang"
3349        modules="ContentChecker::HTML">
3350      <d:message xml:lang="en">Conformance checking for style
3351      language <code><var>{text}</var></code> is not supported;
3352      <em>it might or might not be conforming.</em></d:message>
3353    </d:item>
3354    
3355    <d:item name="atom|content not supported"
3356        modules="ContentChecker::Atom">
3357      <d:message xml:lang="en">Conformance checking for an Atom
3358      <code>content</code> element with <code>type</code>
3359      <code><var>{text}</var></code> is not supported.</d:message>
3360    </d:item>
3361    
3362    <d:item name="help not available"
3363        modules="cc-script">
3364      <d:message xml:lang="en">No more information is available.</d:message>
3365      <d:message xml:lang="ja">これ以上の詳しい情報はありません。</d:message>
3366      <d:desc xml:lang="en">
3367        <p>No more information is available for this topic.</p>
3368      </d:desc>
3369      <d:desc xml:lang="ja">
3370        <p>これについての詳しい情報はありません。</p>
3371    </d:desc>    </d:desc>
3372  </d:item>  </d:item>
3373    
3374  </section>  </section>
3375    
3376    <d:cat name="Input">
3377      <d:text xml:lang="en">Input</d:text>
3378      <d:text xml:lang="ja">入力</d:text>
3379    </d:cat>
3380    
3381    <d:cat name="By URL">
3382      <d:text xml:lang="en">By URL</d:text>
3383      <d:text xml:lang="ja">URL で指定</d:text>
3384    </d:cat>
3385    
3386    <d:cat name="By direct input">
3387      <d:text xml:lang="en">By direct input</d:text>
3388      <d:text xml:lang="ja">直接入力</d:text>
3389    </d:cat>
3390    
3391    <d:cat name="Options">
3392      <d:text xml:lang="en">More options</d:text>
3393      <d:text xml:lang="ja">検査オプション</d:text>
3394    </d:cat>
3395    
3396    <d:cat name="Check error page">
3397      <d:text xml:lang="en">Check an error page</d:text>
3398      <d:text xml:lang="ja">誤り頁を検査する</d:text>
3399    </d:cat>
3400    
3401    <d:cat name="Content type">
3402      <d:text xml:lang="en">Content type</d:text>
3403      <d:text xml:lang="ja">内容型</d:text>
3404    </d:cat>
3405    
3406    <d:cat name="Charset">
3407      <d:text xml:lang="en">Character encoding</d:text>
3408      <d:text xml:lang="ja">文字符号化</d:text>
3409    </d:cat>
3410    
3411    <d:cat name="As specified">
3412      <d:text xml:lang="en">As specified</d:text>
3413      <d:text xml:lang="ja">指定通り</d:text>
3414    </d:cat>
3415    
3416    <d:cat name="Japanese charsets">
3417      <d:text xml:lang="en">Japanese character encodings</d:text>
3418      <d:text xml:lang="ja">日本語用文字符号化</d:text>
3419    </d:cat>
3420    
3421    <d:cat name="European charsets">
3422      <d:text xml:lang="en">European character encodings</d:text>
3423      <d:text xml:lang="ja">欧米言語用文字符号化</d:text>
3424    </d:cat>
3425    
3426    <d:cat name="Asian charsets">
3427      <d:text xml:lang="en">Asian character encodings</d:text>
3428      <d:text xml:lang="ja">アジア諸語用文字符号化</d:text>
3429    </d:cat>
3430    
3431    <d:cat name="Unicode charsets">
3432      <d:text xml:lang="en">Unicode character encodings</d:text>
3433      <d:text xml:lang="ja">Unicode 系文字符号化</d:text>
3434    </d:cat>
3435    
3436    <d:cat name="Document source to check">
3437      <d:text xml:lang="en">Document source to check</d:text>
3438      <d:text xml:lang="ja">検査する文書のソース</d:text>
3439    </d:cat>
3440    
3441    <d:cat name="Check">
3442      <d:text xml:lang="en">Check</d:text>
3443      <d:text xml:lang="ja">検査</d:text>
3444    </d:cat>
3445    
3446    <d:cat name="Setting innerHTML">
3447      <d:text xml:lang="en">Setting <code>innerHTML</code> of HTML element</d:text>
3448      <d:text xml:lang="ja"><code>innerHTML</code> に値を設定する HTML 要素</d:text>
3449    </d:cat>
3450    
3451    <d:cat name="Information">
3452      <d:text xml:lang="en">Information</d:text>
3453      <d:text xml:lang="ja">情報</d:text>
3454    </d:cat>
3455    
3456    <d:cat name="HTTP Header">
3457      <d:text xml:lang="en"><abbr title="Hypertext Transfer Protocol">HTTP</abbr>
3458          Header</d:text>
3459      <d:text xml:lang="ja"><abbr lang="en" title="Hypertext Transfer Protocol">HTTP</abbr>
3460          頭部</d:text>
3461    </d:cat>
3462    
3463    <d:cat name="Parse Errors Section">
3464      <d:text xml:lang="en">Parse Errors</d:text>
3465      <d:text xml:lang="ja">構文誤り</d:text>
3466    </d:cat>
3467    
3468    <d:cat name="Parse Errors">
3469      <d:text xml:lang="en">Parse Errors</d:text>
3470      <d:text xml:lang="ja">構文誤り</d:text>
3471    </d:cat>
3472    
3473    <d:cat name="Document Source">
3474      <d:text xml:lang="en">Document Source</d:text>
3475      <d:text xml:lang="ja">文書のソース</d:text>
3476    </d:cat>
3477    
3478    <d:cat name="Source">
3479      <d:text xml:lang="en">Source</d:text>
3480      <d:text xml:lang="ja">ソース</d:text>
3481    </d:cat>
3482    
3483    <d:cat name="Tables Section">
3484      <d:text xml:lang="en">Structure of Tables</d:text>
3485      <d:text xml:lang="ja">表の構造</d:text>
3486    </d:cat>
3487    
3488    <d:cat name="Tables">
3489      <d:text xml:lang="en">Tables</d:text>
3490      <d:text xml:lang="ja">表</d:text>
3491    </d:cat>
3492    
3493    <d:cat name="Document Tree">
3494      <d:text xml:lang="en">Document Tree</d:text>
3495      <d:text xml:lang="ja">文書木</d:text>
3496    </d:cat>
3497    
3498    <d:cat name="Tree">
3499      <d:text xml:lang="en">Tree</d:text>
3500      <d:text xml:lang="ja">木</d:text>
3501    </d:cat>
3502    
3503    <d:cat name="Document">
3504      <d:text xml:lang="en">Document</d:text>
3505      <d:text xml:lang="ja">文書</d:text>
3506    </d:cat>
3507    
3508    <d:cat name="Document Structure">
3509      <d:text xml:lang="en">Document Structure</d:text>
3510      <d:text xml:lang="ja">文書構造</d:text>
3511    </d:cat>
3512    
3513    <d:cat name="Structure">
3514      <d:text xml:lang="en">Structure</d:text>
3515      <d:text xml:lang="ja">構造</d:text>
3516    </d:cat>
3517    
3518    <d:cat name="Reformatted Document Source">
3519      <d:text xml:lang="en">Reformatted Document Source</d:text>
3520      <d:text xml:lang="ja">再整形した文書のソース</d:text>
3521    </d:cat>
3522    
3523    <d:cat name="Reformatted">
3524      <d:text xml:lang="en">Reformatted</d:text>
3525      <d:text xml:lang="ja">再整形</d:text>
3526    </d:cat>
3527    
3528    <d:cat name="RDF Triples">
3529      <d:text xml:lang="en"><abbr>RDF</abbr> Triples</d:text>
3530      <d:text xml:lang="ja"><abbr lang="en">RDF</abbr> 三項組</d:text>
3531    </d:cat>
3532    
3533    <d:cat name="RDF">
3534      <d:text xml:lang="en"><abbr>RDF</abbr></d:text>
3535      <d:text xml:lang="ja"><abbr lang="en">RDF</abbr></d:text>
3536    </d:cat>
3537    
3538    <d:cat name="Structural Errors">
3539      <d:text xml:lang="en">Structural Errors</d:text>
3540      <d:text xml:lang="ja">構造的誤り</d:text>
3541    </d:cat>
3542    
3543    <d:cat name="Struct. Errors">
3544      <d:text xml:lang="en">Struct. Errors</d:text>
3545      <d:text xml:lang="ja">構造誤り</d:text>
3546    </d:cat>
3547    
3548    <d:cat name="Transfer Errors">
3549      <d:text xml:lang="en">Transfer Errors</d:text>
3550      <d:text xml:lang="ja">転送誤り</d:text>
3551    </d:cat>
3552    
3553    <d:cat name="Trans. Errors">
3554      <d:text xml:lang="en">Trans. Errors</d:text>
3555      <d:text xml:lang="ja">転送誤り</d:text>
3556    </d:cat>
3557    
3558    <d:cat name="Result">
3559      <d:text xml:lang="en">Result</d:text>
3560      <d:text xml:lang="ja">結果</d:text>
3561    </d:cat>
3562    
3563    <d:cat name="manakaiCompatMode:quirks">
3564      <d:text xml:lang="en">Quirks Mode</d:text>
3565      <d:text xml:lang="ja">奇癖モード</d:text>
3566    </d:cat>
3567    
3568    <d:cat name="manakaiCompatMode:limited quirks">
3569      <d:text xml:lang="en">Limited Quirks Mode</d:text>
3570      <d:text xml:lang="ja">限定奇癖モード</d:text>
3571    </d:cat>
3572    
3573    <d:cat name="manakaiCompatMode:no quirks">
3574      <d:text xml:lang="en">No Quirks Mode</d:text>
3575      <d:text xml:lang="ja">無奇癖モード</d:text>
3576    </d:cat>
3577    
3578    <d:cat name="manakaiIsHTML:1">
3579      <d:text xml:lang="en">HTML Document</d:text>
3580      <d:text xml:lang="ja">HTML 文書</d:text>
3581    </d:cat>
3582    
3583    <d:cat name="manakaiIsHTML:0">
3584      <d:text xml:lang="en">XML Document</d:text>
3585      <d:text xml:lang="ja">XML 文書</d:text>
3586    </d:cat>
3587    
3588    <d:cat name="manakaiCharset">
3589      <d:text xml:lang="en"><code>charset</code> parameter</d:text>
3590      <d:text xml:lang="ja"><code lang="en">charset</code> 引数</d:text>
3591    </d:cat>
3592    
3593    <d:cat name="inputEncoding">
3594      <d:text xml:lang="en">Input character encoding</d:text>
3595      <d:text xml:lang="ja">入力に用いた文字符号化</d:text>
3596    </d:cat>
3597    
3598    <d:cat name="xmlVersion">
3599      <d:text xml:lang="en">XML <code>version</code></d:text>
3600      <d:text xml:lang="ja">XML <code lang="en">version</code></d:text>
3601    </d:cat>
3602    
3603    <d:cat name="xmlEncoding">
3604      <d:text xml:lang="en">XML <code>encoding</code></d:text>
3605      <d:text xml:lang="ja">XML <code lang="en">encoding</code></d:text>
3606    </d:cat>
3607    
3608    <d:cat name="xmlStandalone">
3609      <d:text xml:lang="en">XML <code>standalone</code></d:text>
3610      <d:text xml:lang="ja">XML <code lang="en">standalone</code></d:text>
3611    </d:cat>
3612    
3613    <d:cat name="... with BOM">
3614      <d:text xml:lang="en"> (with <code class="charname"><abbr title="BYTE ORDER MARK">BOM</abbr></code>)</d:text>
3615      <d:text xml:lang="ja"> (<code class="charname" lang="en"><abbr title="BYTE ORDER MARK">BOM</abbr></code> つき)</d:text>
3616    </d:cat>
3617    
3618    <d:cat name="URL">
3619      <d:text xml:lang="en"><abbr title="Uniform Resource Locator">URL</abbr></d:text>
3620      <d:text xml:lang="ja"><abbr title="統一資源所在子">URL</abbr></d:text>
3621    </d:cat>
3622    
3623    <d:cat name="URLs">
3624      <d:text xml:lang="en"><abbr title="Uniform Resource Locators">URLs</abbr></d:text>
3625      <d:text xml:lang="ja"><abbr title="統一資源所在子">URL</abbr></d:text>
3626    </d:cat>
3627    
3628    <d:cat name="Container Node">
3629      <d:text xml:lang="en">Container Node</d:text>
3630      <d:text xml:lang="ja">この文書を含む節点</d:text>
3631    </d:cat>
3632    
3633    <d:cat name="Table Element">
3634      <d:text xml:lang="en">Table Element</d:text>
3635      <d:text xml:lang="ja">表要素</d:text>
3636    </d:cat>
3637    
3638    <d:cat name="Base URL">
3639      <d:text xml:lang="en">Base URL</d:text>
3640      <d:text xml:lang="ja">基底 URL</d:text>
3641    </d:cat>
3642    
3643    <d:cat name="Internet Media Type">
3644      <d:text xml:lang="en">Internet Media Type</d:text>
3645      <d:text xml:lang="ja">インターネット媒体型</d:text>
3646    </d:cat>
3647    
3648    <d:cat name="Character Encoding">
3649      <d:text xml:lang="en">Character Encoding</d:text>
3650      <d:text xml:lang="ja">文字符号化</d:text>
3651    </d:cat>
3652    
3653    <d:cat name="Byte Length">
3654      <d:text xml:lang="en">Byte Length</d:text>
3655      <d:text xml:lang="ja">バイト長</d:text>
3656    </d:cat>
3657    
3658    <d:cat name="Character Length">
3659      <d:text xml:lang="en">Character Length</d:text>
3660      <d:text xml:lang="ja">文字長</d:text>
3661    </d:cat>
3662    
3663    <d:cat name="... overridden">
3664      <d:text xml:lang="en"> (<i>overridden</i>)</d:text>
3665      <d:text xml:lang="ja"> (<i>上書き</i>)</d:text>
3666    </d:cat>
3667    
3668    <d:cat name="... overridden, official type is #">
3669      <d:text xml:lang="en"> (<i>overridden</i>; official type is
3670          <code lang="en" class="MIME"><var>{text}</var></code>)</d:text>
3671      <d:text xml:lang="ja"> (<i>上書き</i>, 公式型は
3672          <code lang="en" class="MIME"><var>{text}</var></code>)</d:text>
3673    </d:cat>
3674    
3675    <d:cat name="... sniffed">
3676      <d:text xml:lang="en"> (<i>sniffed</i>)</d:text>
3677      <d:text xml:lang="ja"> (<i>探知結果</i>)</d:text>
3678    </d:cat>
3679    
3680    <d:cat name="byte">
3681      <d:text xml:lang="en">byte</d:text>
3682      <d:text xml:lang="ja">バイト</d:text>
3683    </d:cat>
3684    
3685    <d:cat name="bytes">
3686      <d:text xml:lang="en">bytes</d:text>
3687      <d:text xml:lang="ja">バイト</d:text>
3688    </d:cat>
3689    
3690    <d:cat name="Explicit entries">
3691      <d:text xml:lang="en">Explicit entries</d:text>
3692      <d:text xml:lang="ja">明示的項目</d:text>
3693    </d:cat>
3694    
3695    <d:cat name="Fallback entries">
3696      <d:text xml:lang="en">Fallback entries</d:text>
3697      <d:text xml:lang="ja">滑り止め項目</d:text>
3698    </d:cat>
3699    
3700    <d:cat name="Opportunistic caching namespace">
3701      <d:text xml:lang="en">Opportunistic caching namespace</d:text>
3702      <d:text xml:lang="ja">日和見的キャッシュ化名前空間</d:text>
3703    </d:cat>
3704    
3705    <d:cat name="Fallback entry">
3706      <d:text xml:lang="en">Fallback entry</d:text>
3707      <d:text xml:lang="ja">滑り止め項目</d:text>
3708    </d:cat>
3709    
3710    <d:cat name="Online whitelist">
3711      <d:text xml:lang="en">Online whitelist</d:text>
3712      <d:text xml:lang="ja">オンライン・ホワイトリスト</d:text>
3713    </d:cat>
3714    
3715    <d:cat name="No entry">
3716      <d:text xml:lang="en">No entry</d:text>
3717      <d:text xml:lang="ja">項目なし</d:text>
3718    </d:cat>
3719    
3720    <d:cat name="Subject">
3721      <d:text xml:lang="en">Subject</d:text>
3722      <d:text xml:lang="ja">主語</d:text>
3723    </d:cat>
3724    
3725    <d:cat name="Predicate">
3726      <d:text xml:lang="en">Predicate</d:text>
3727      <d:text xml:lang="ja">述語</d:text>
3728    </d:cat>
3729    
3730    <d:cat name="Object">
3731      <d:text xml:lang="en">Object</d:text>
3732      <d:text xml:lang="ja">目的語</d:text>
3733    </d:cat>
3734    
3735    <d:cat name="character">
3736      <d:text xml:lang="en">character</d:text>
3737      <d:text xml:lang="ja">文字</d:text>
3738    </d:cat>
3739    
3740    <d:cat name="characters">
3741      <d:text xml:lang="en">characters</d:text>
3742      <d:text xml:lang="ja">文字</d:text>
3743    </d:cat>
3744    
3745    <d:cat name="Line #">
3746      <d:text xml:lang="en">Line <var>{text}</var></d:text>
3747      <d:text xml:lang="ja"><var>{text}</var> 行</d:text>
3748    </d:cat>
3749    
3750    <d:cat name="column #">
3751      <d:text xml:lang="en">column <var>{text}</var></d:text>
3752      <d:text xml:lang="ja"><var>{text}</var> 列</d:text>
3753    </d:cat>
3754    
3755    <d:cat name="Index #">
3756      <d:text xml:lang="en">Index <var>{text}</var></d:text>
3757      <d:text xml:lang="ja">索引 #<var>{text}</var></d:text>
3758    </d:cat>
3759    
3760    <d:cat name="Unknown location">
3761      <d:text xml:lang="en">Unknown location</d:text>
3762      <d:text xml:lang="ja">位置不明</d:text>
3763    </d:cat>
3764    
3765    <d:cat name="(Unknown)">
3766      <d:text xml:lang="en">(Unknown)</d:text>
3767      <d:text xml:lang="ja">(不明)</d:text>
3768    </d:cat>
3769    
3770    <d:cat name="Description">
3771      <d:text xml:lang="en">Description</d:text>
3772      <d:text xml:lang="ja">説明</d:text>
3773    </d:cat>
3774    
3775    <d:cat name="Table #">
3776      <d:text xml:lang="en">Structure of Table #<var>{text}</var></d:text>
3777      <d:text xml:lang="ja">表 #<var>{text}</var> の構造</d:text>
3778    </d:cat>
3779    
3780    <d:cat name="Subdocument #">
3781      <d:text xml:lang="en">Subdocument #<var>{text}</var></d:text>
3782      <d:text xml:lang="ja">部分文書 #<var>{text}</var></d:text>
3783    </d:cat>
3784    
3785    <d:cat name="Sub #">
3786      <d:text xml:lang="en">Sub #<var>{text}</var></d:text>
3787      <d:text xml:lang="ja">部分 #<var>{text}</var></d:text>
3788    </d:cat>
3789    
3790    <d:cat name="...">
3791      <d:text xml:lang="en">..</d:text><!-- TODO: figure hyphen? -->
3792      <d:text xml:lang="ja">〜</d:text>
3793    </d:cat>
3794    
3795    <d:cat name="Score">
3796      <d:text xml:lang="en">Score</d:text>
3797      <d:text xml:lang="ja">得点</d:text>
3798    </d:cat>
3799    
3800    <d:cat name="Subtotal">
3801      <d:text xml:lang="en">Subtotal</d:text>
3802      <d:text xml:lang="ja">小計</d:text>
3803    </d:cat>
3804    
3805    <d:cat name="Total">
3806      <d:text xml:lang="en">Total</d:text>
3807      <d:text xml:lang="ja">合計</d:text>
3808    </d:cat>
3809    
3810    <d:cat name="Main document">
3811      <d:text xml:lang="en">Main document</d:text>
3812      <d:text xml:lang="ja">主文書</d:text>
3813    </d:cat>
3814    
3815    <d:cat name="Subdocuments">
3816      <d:text xml:lang="en">Subdocuments</d:text>
3817      <d:text xml:lang="ja">部分文書</d:text>
3818    </d:cat>
3819    
3820    <d:cat name="Transfer L.">
3821      <d:text xml:lang="en"><abbr title="Transfer protocol">Transfer</abbr></d:text>
3822      <d:text xml:lang="ja"><abbr title="転送プロトコル">転送</abbr></d:text>
3823    </d:cat>
3824    
3825    <d:cat name="Encode L.">
3826      <d:text xml:lang="en"><abbr title="Character encoding">Encoding</abbr></d:text>
3827      <d:text xml:lang="ja"><abbr title="文字符号化">符号</abbr></d:text>
3828    </d:cat>
3829    
3830    <d:cat name="Char L.">
3831      <d:text xml:lang="en"><abbr title="Coded characters">Character</abbr></d:text>
3832      <d:text xml:lang="ja"><abbr title="符号化文字">文字</abbr></d:text>
3833    </d:cat>
3834    
3835    <d:cat name="Syntax L.">
3836      <d:text xml:lang="en">Syntax</d:text>
3837      <d:text xml:lang="ja">構文</d:text>
3838    </d:cat>
3839    
3840    <d:cat name="Structure L.">
3841      <d:text xml:lang="en">Structure</d:text>
3842      <d:text xml:lang="ja">構造</d:text>
3843    </d:cat>
3844    
3845    <d:cat name="Semantics L.">
3846      <d:text xml:lang="en">Semantics</d:text>
3847      <d:text xml:lang="ja">意味</d:text>
3848    </d:cat>
3849    
3850    <d:cat name="N/A">
3851      <d:text xml:lang="en">N/A</d:text>
3852      <d:text xml:lang="ja">−</d:text>
3853    </d:cat>
3854    
3855    <d:cat name="No error found.">
3856      <d:text xml:lang="en">No error found.</d:text>
3857      <d:text xml:lang="ja">誤りは見つかりませんでした。</d:text>
3858    </d:cat>
3859    
3860    <d:cat name="No transfer error found.">
3861      <d:text xml:lang="en">This document has no transfer protocol header error.</d:text>
3862      <d:text xml:lang="ja">転送プロトコルの頭部に誤りは見つかりませんでした。</d:text>
3863    </d:cat>
3864    
3865    <d:cat name="No parse error found.">
3866      <d:text xml:lang="en">This document has no parse error.</d:text>
3867      <d:text xml:lang="ja">構文解析中に誤りは見つかりませんでした。</d:text>
3868    </d:cat>
3869    
3870    <d:cat name="No structural error found.">
3871      <d:text xml:lang="en">This document has no structral error.</d:text>
3872      <d:text xml:lang="ja">構造上の誤りは見つかりませんでした。</d:text>
3873    </d:cat>
3874    
3875    <d:cat name="This checker is work in progress.">
3876      <d:text xml:lang="en">
3877        <p><strong>Important</strong>: This conformance checking service
3878        is <em>under development</em>.  The result above might be <em>wrong</em>.</p>
3879      </d:text>
3880      <d:text xml:lang="ja">
3881        <p><strong>重要</strong>: この適合性検査サービスは<em>開発中</em>です。
3882        この結果は<em>間違い</em>かもしれません。</p>
3883      </d:text>
3884    </d:cat>
3885    
3886    <d:cat name="Conformance is conforming">
3887      <d:text xml:lang="en">No conformance‐error is
3888          found in this document.</d:text>
3889      <d:text xml:lang="ja">この文書に適合性に関わる誤りは見つかりませんでした。</d:text>
3890    </d:cat>
3891    
3892    <d:cat name="Conformance is should-error">
3893      <d:text xml:lang="en">This document
3894            is <strong>likely <em>non</em>-conforming</strong>, but in rare case
3895            it might be conforming.  The checker cannot determine whether
3896            this document is in the rare case or not.</d:text>
3897      <d:text xml:lang="ja">この文書は<strong>おそらく<em>不</em>適合</strong>ですが、
3898          稀に適合している場合もあります。適合性検査器はこの文書が稀な場合に該当するかどうか判定できません。</d:text>
3899    </d:cat>
3900    
3901    <d:cat name="Conformance is non-conforming">
3902      <d:text xml:lang="en">This document is
3903            <strong><em>non</em>-conforming</strong>.</d:text>
3904      <d:text xml:lang="ja">この文書は<strong><em>不</em>適合</strong>です。</d:text>
3905    </d:cat>
3906    
3907    <d:cat name="Conformance is uncertain">
3908      <d:text xml:lang="en">The conformance
3909            checker cannot decide whether the document is conforming or
3910            not, since the document contains one or more unsupported
3911            features.  The document might or might not be conforming.</d:text>
3912      <d:text xml:lang="ja">適合性検査器はこの文書が適合するかどうか判定できませんでした。
3913          この文書は適合性検査器が対応していない機能を使っています。
3914          この文書は適合しているかもしれませんし、していないかもしれません。</d:text>
3915    </d:cat>
3916    
3917    <d:cat name="Error level m">
3918      <d:text xml:lang="en"><a href="../error-description#Error-level-m" rel="help"><em class="rfc2119">MUST</em>‐level
3919            error</a></d:text>
3920      <d:text xml:lang="ja"><a href="../error-description#Error-level-m" rel="help"><em class="rfc2119" title="REQUIRED">必須</em>級の誤り</a></d:text>
3921      <d:desc xml:lang="en">
3922        <p>A violation to a hard requirement of the specification.
3923        The document is non‐conforming.</p>
3924      </d:desc>
3925    </d:cat>
3926    
3927    <d:cat name="Error level s">
3928      <d:text xml:lang="en"><a href="../error-description#Error-level-s" rel="help"><em class="rfc2119">SHOULD</em>‐level
3929            error</a></d:text>
3930      <d:text xml:lang="ja"><a href="../error-description#Error-level-s" rel="help"><em class="rfc2119" title="RECOMMENDED">推奨</em>級の誤り</a></d:text>
3931      <d:desc xml:lang="en">
3932        <p>A violation to a requirement of the specification.
3933        The violation might be legitimize in some case.  Otherwise,
3934        the document is non‐conforming.</p>
3935      </d:desc>
3936    </d:cat>
3937    
3938    <d:cat name="Error level w">
3939      <d:text xml:lang="en"><a href="../error-description#Error-level-w" rel="help">Warning</a></d:text>
3940      <d:text xml:lang="ja"><a href="../error-description#Error-level-w" rel="help">警告</a></d:text>
3941      <d:desc xml:lang="en">
3942        <p>A warning is an advice from the conformance checker
3943        to avoid solving a problem in a confusing or possibly wrong way.
3944        It does not affect to the conformance of the document, and
3945        may sometimes be inappropriate.</p>
3946      </d:desc>
3947    </d:cat>
3948    
3949    <d:cat name="Error level i">
3950      <d:text xml:lang="en"><a href="../error-description#Error-level-i" rel="help">Information</a></d:text>
3951      <d:text xml:lang="ja"><a href="../error-description#Error-level-i" rel="help">情報</a></d:text>
3952      <d:desc xml:lang="en">
3953        <p>An informational message just provides an additional information
3954        on the feature used in the document or the status of the retrieval
3955        or so on.
3956        It does not affect to the conformance of the document.</p>
3957      </d:desc>
3958    </d:cat>
3959    
3960    <d:cat name="Error level u">
3961      <d:text xml:lang="en"><a href="../error-description#Error-level-u" rel="help">Not
3962          supported</a></d:text>
3963      <d:text xml:lang="ja"><a href="../error-description#Error-level-u" rel="help">未対応</a></d:text>
3964      <d:desc xml:lang="en">
3965        <p>Some feature that is not supported by the conformance checker
3966        is used in the document.</p>
3967      </d:desc>
3968    </d:cat>
3969    
3970  <section id="license">  <section id="license">
3971  <h2>License of This Document</h2>  <h2>License of This Document</h2>
3972    
3973  <p>Copyright 2007 <a href="http://suika.fam.cx/~wakaba/who?">Wakaba</a></p>  <p>Copyright <time>2007</time>‐<time>2008</time>
3974  <p>This library is free software; you can redistribute it  <a href="http://suika.fam.cx/~wakaba/who?" rel="author" xml:lang="ja">Wakaba</a>
3975    <code class="mail">&lt;<a href="mailto:w@suika.fam.cx">w@suika.fam.cx</a>></code>.</p>
3976    
3977    <p>This document is free software; you can redistribute it
3978  and/or modify it under the same terms as Perl itself.</p>  and/or modify it under the same terms as Perl itself.</p>
3979  </section>  </section>
3980    
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