/[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 1.32 by wakaba, Fri Aug 15 14:11:13 2008 UTC
# Line 11  Web Document Conformance Checker (BETA)< Line 11  Web Document Conformance Checker (BETA)<
11  <body>  <body>
12  <h1>Description of Errors</h1>  <h1>Description of Errors</h1>
13    
14  <section id="html5-parse-errors">  <section id="character-encoding-layer">
15  <h2>HTML5 Parse Errors</h2>  <h2>Character Encoding Layer Errors</h2>
16    
17  <d:item name="after head"  <d:item name="illegal-octets-error" class="error-category-charset" level="m">
18      <d:message xml:lang="en">An illegal octet in the input stream.</d:message>
19    </d:item>
20    </section>
21    
22    <section id="html5-character-encoding">
23    <h2>HTML5 Character Encoding Errors</h2>
24    
25    <d:item name="disallowed character encoding"
26        modules="ContentChecker">
27      <d:message xml:lang="en">Character encoding <code><var>{text}</var></code>
28      is not allowed for <abbr>HTML</abbr> document.</d:message>
29      <d:desc xml:lang="en">
30        <p>The character encoding used for the document is not allowed
31        for <abbr>HTML</abbr> document.  The document is non‐conforming.</p>
32      </d:desc>
33    </d:item>
34    
35    <d:item name="bad character encoding"
36        modules="ContentChecker">
37      <d:message xml:lang="en">Character encoding <code><var>{text}</var></code>
38      should not be used for <abbr>HTML</abbr> document.</d:message>
39      <d:desc xml:lang="en">
40        <p>The character encoding used for the document is not recommended
41        for <abbr>HTML</abbr> document.  The document is non‐conforming
42        unless there is any good reason to use that encoding.</p>
43      </d:desc>
44    </d:item>
45    
46    <d:item name="non-utf-8 character encoding"
47        modules="ContentChecker">
48      <d:message xml:lang="en">Use of UTF-8 is encouraged (this document
49      is encoded in <code><var>{text}</var></code>).</d:message>
50      <d:desc xml:lang="en">
51        <p>Use of UTF-8 as the character encoding of the document is encouraged,
52        though the use of another character encoding is still conforming.</p>
53      </d:desc>
54    </d:item>
55    
56    <d:item name="character encoding unchecked"
57        modules="ContentChecker">
58      <d:message xml:lang="en">Conformance for character encoding requirements
59      cannot be checked, since the input is not a byte stream.</d:message>
60      <d:desc xml:lang="en">
61        <p>The conformance checker cannot detect whether the input document
62        met the requirements on character encoding, since the document
63        is not inputed as a serialized byte sequence.  The document is
64        not conforming if it is not encoded in an appropriate character
65        encoding with appropriate labeling.</p>
66      </d:desc>
67    </d:item>
68    
69    <d:item name="no character encoding declaration"
70        modules="ContentChecker">
71      <d:message xml:lang="en">There is no character encoding
72      declaration.</d:message>
73      <d:desc xml:lang="en">
74        <p>The document does not contain a character encoding
75        declaration.  Unless the character encoding is explicitly
76        specified in lower‐level protocol, e.g. in <abbr>HTTP</abbr>,
77        or is implied by <abbr>BOM</abbr>, there must be a character
78        encoding declaration.  The document is non‐conforming.</p>
79    
80        <p>The long character encoding declaration syntax
81        <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
82        is obsolete.  The new syntax is:</p>
83        <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
84    
85        <p>Note that the <code>encoding</code> declaration in <abbr>XML</abbr>
86        declaration has no effect for <abbr>HTML</abbr> document.</p>
87      </d:desc>
88    </d:item>
89    
90    <d:item name="non ascii superset"
91        modules="ContentChecker">
92      <d:message xml:lang="en">No character encoding metadata is found
93      in lower‐level protocol nor is there <abbr>BOM</abbr>, while
94      character encoding <code><var>{text}</var></code>
95      is not a superset of <abbr>ASCII</abbr>.</d:message>
96      <d:desc xml:lang="en">
97        <p>The document is not labeled with character encoding name
98        in lower‐level protocol, e.g. in <abbr>HTTP</abbr>, and
99        the document is not begin with <abbr>BOM</abbr>.  In addition,
100        the character encoding of the document is not a superset of
101        <abbr>ASCII</abbr>.  The document is non‐conforming.</p>
102    
103        <p>Unless there is a <abbr>BOM</abbr>, the character encoding
104        for the document must be specified in e.g. <abbr>HTTP</abbr>‐level,
105        as:</p>
106        <pre class="http example"><code>Content-Type: text/html; charset=<var>charset-name</var></code></pre>
107    
108        <p>Existence of <abbr>HTML</abbr> character encoding declaration, i.e.
109        <code class="html example">&lt;meta charset="<var>charset-name</var>"></code>,
110        does not allow to omit <code>charset</code> parameter
111        for <abbr>HTML</abbr> document encoded in non‐<abbr>ASCII</abbr>
112        compatible encoding.</p>
113    
114        <p>Character encodings <code>Shift_JIS</code>, <code>Windows-31J</code>,
115        and <code>ISO-2022-JP</code> are <em>not</em> a superset of
116        <abbr>ASCII</abbr> for the purpose of <abbr>HTML</abbr> conformance.</p>
117      </d:desc>
118    </d:item>
119    
120    <d:item name="sniffing:chardet"
121        modules="HTML::Parser">
122      <d:message xml:lang="en">Character encoding of this document is sniffed
123      as <code><var>{text}</var></code> (Sniffed because no explicit specification
124      for the character encoding of this document is found in the transfer
125      procotol headers).</d:message>
126    </d:item>
127    
128    <d:item name="sniffing:default"
129        modules="HTML::Parser">
130      <d:message xml:lang="en">Character encoding of this document is defaulted
131      to <code><var>{text}</var></code> because no explicit specification
132      for the character encoding of this document is found in the transfer
133      procotol headers.</d:message>
134    </d:item>
135    
136    <d:item name="chardecode:fallback"
137        modules="HTML::Parser">
138      <d:message xml:lang="en">Since no decoder for the document character
139      encoding is found, decoder for the character encoding
140      <code><var>{text}</var></code> is used.  Checking results might be
141      <em>wrong</em>.</d:message>
142    </d:item>
143    
144    <d:item name="chardecode:no error"
145        modules="HTML::Parser">
146      <d:message xml:lang="en">Conformance error checking for the character
147      encoding <code><var>{text}</var></code> is not supported.</d:message>
148    </d:item>
149    
150    <d:item name="charset label:matching"
151        modules="HTML::Parser">
152      <d:message xml:lang="en">Sniffed character encoding
153      <code><var>{text}</var></code> is same as the character encoding specified
154      in the character encoding declaration.  This is <em>not</em> an
155      error.</d:message>
156    </d:item>
157    
158    <d:item name="charset label detected"
159        class="format-charset warning"
160        modules="HTML::Parser">
161      <d:message xml:lang="en">While parsing the document as
162      <code><var>{text}</var></code>, a character encoding declaration specifying
163      a different character encoding is found.  The document
164      is reparsed.</d:message>
165      <d:desc xml:lang="en">
166        <p>While parsing a document in a character encoding,
167        a character encoding declaration which declares the character
168        encoding of the document as another character encoding is found.
169        The occurence of this warning itself does not make the document
170        non‐conforming.  However, the failure of the first attempt to
171        to detect the character encoding might be a result of non‐conformance
172        of the document.</p>
173    
174        <p>The document will be reparsed from the beginning.  Some error
175        or warning might be reported again.</p>
176    
177        <p>These are suggestions to avoid this warning:</p>
178        <ul>
179        <li>Specify <code>charset</code> parameter in the <code>Content-Type</code>
180        field in the <abbr>HTTP</abbr> header, as:
181        <pre class="HTTP example"><code>Content-Type: text/html; charset="<var>charset-name</var>"</code></pre></li>
182        <li>Put the character encoding declaration
183        (<code class="html example">&lt;meta charset="<var>charset-name</var>"></code>)
184        just after <code class="html example">&lt;head></code> start tag.</li>
185        <li>Use <code>UTF-8</code>.</li>
186        </ul>
187      </d:desc>
188    </d:item>
189    
190    <d:item name="NULL"
191        modules="HTML::Parser">
192      <d:message xml:lang="en">The <code class="charname">NULL</code> character
193      is not allowed.</d:message>
194    </d:item>
195    
196    <d:item name="control char"
197        modules="HTML::Parser">
198      <d:message xml:lang="en">Code point <code><var>{text}</var></code> is
199      not allowed.</d:message>
200    </d:item>
201    
202    </section>
203    
204    <section id="html5-tokenize-error">
205    <h2>HTML5 Parse Errors in Tokenization Stage</h2>
206    
207    <d:item name="after html"
208      class="parse-error">      class="parse-error">
209    <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>
210    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>
211    <d:desc xml:lang="en">    <d:desc xml:lang="en">
212      <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
213      but before the <code>body</code> element is opened.      <code>html</code> element has been closed.  The document is
214        non-conforming.</p>
215    
216        <p>Any content of the document other than comments
217        must be put into the <code>html</code> element.</p>
218      </d:desc>
219    </d:item>
220    
221    <d:item name="after body"
222        class="parse-error">
223      <d:message xml:lang="en">Tag <code>&lt;<var>$0</var>&gt;</code>
224      is not allowed after the end tag <code>&lt;/body></code>.</d:message>
225      <d:desc xml:lang="en">
226        <p>The start or end tag of an element appears after the
227        <code>body</code> element has been closed.  The document is
228        non-conforming.</p>
229    
230        <p>Any content of the document other than <code>head</code>
231        contents and comments must be put into the <code>body</code>
232        element.</p>
233      </d:desc>
234    </d:item>
235    
236    <d:item name="bad attribute name"
237        class="tokenize-error"
238        modules="HTML::Parser">
239      <d:message xml:lang="en">Attribute name cannot contain characters
240      <code>"</code>, <code>'</code>, and <code>=</code>.</d:message>
241    </d:item>
242    
243    <d:item name="bad attribute value"
244        class="tokenize-error"
245        modules="HTML::Parser">
246      <d:message xml:lang="en">Attribute value must be quoted by <code>"</code>
247      or <code>'</code> if it contains a <code>"</code>, <code>'</code>, or
248      <code>=</code> character.</d:message>
249    </d:item>
250    
251    <d:item name="bare ero"
252        class="tokenize-error"
253        modules="HTML::Parser">
254      <d:message xml:lang="en">The <code>&amp;</code> character must
255      be escaped as <code class="html example">&amp;amp;</code>.</d:message>
256      <d:desc xml:lang="en">
257        <p>An <code>&amp;</code> character which
258        is not part of any reference appears in the input stream.
259        The document is non‐conforming.</p>
260    
261        <p><em>Any <code>&amp;</code> character in URI (or IRI)
262        must be escaped as <code class="example">&amp;amp;</code>.</em></p>
263    
264        <p>The <code>&amp;</code> character must
265        be the first character of a reference:
266          <dl class="switch">
267          <dt>Named entity reference</dt>
268              <dd><pre class="html example"><code>&amp;<var>entity-name</var>;</code></pre>
269              where <var>entity-name</var> is the name of the
270              character entity to be referenced.</dd>
271          <dt>Numeric character reference</dt>
272              <dd><pre class="html example"><code>&amp;#<var>d</var>;</code></pre>
273              where <var>d</var> is the decimal representation of
274              the code position of the character to be referenced.</dd>
275          <dt>Hexadecimal character reference</dt>
276              <dd><pre class="html example"><code>&amp;#x<var>h</var>;</code></pre>
277              where <var>h</var> is the hexadecimal representation
278              of the code position of the character to be referenced.</dd>
279          </dl>
280        </p>
281    
282        <p>To represent <code>&amp;</code> as a data character, use
283        named entity reference:
284          <pre class="html example"><code>&amp;amp;</code></pre>
285        </p>
286      </d:desc>
287    </d:item>
288    
289    <d:item name="bare etago"
290        class="tokenize-error"
291        modules="HTML::Parser">
292      <d:message xml:lang="en">A <code>&lt;/</code> string is not followed
293      by a tag name.</d:message><!-- </ EOF -->
294      <d:desc xml:lang="en">
295        <p>There is a <code>&lt;</code> (<code>U+003C</code>
296        <code class="charname">LESS-THAN SIGN</code>) character
297        immediately followed by a <code>/</code> (<code>U+005F</code>
298        <code>SOLIDUS</code>) character, which is not part
299        of any end tag, in the input stream.  The document
300        is non-conforming.</p>
301    
302        <p>The <code>&lt;/</code> sequence immediately followed
303        by an <abbr title="End of file pseudo-character">EOF</abbr> is
304        interpreted as a string data of <code>&lt;/</code>.</p>
305    
306        <p>The <code>&lt;/</code> sequence as string data must
307        be escaped as:
308        <pre class="html example"><code>&amp;lt;/</code></pre>
309        </p>
310      </d:desc>
311    </d:item>
312    
313    <d:item name="bare stago"
314        class="tokenize-error"
315        modules="HTML::Parser">
316      <d:message xml:lang="en">A <code>&lt;</code> character is not followed
317      by tag name or by a <code>!</code> character.</d:message>
318      <d:desc xml:lang="en">
319        <p>A <code>&lt;</code> (<code>U+003C</code>
320        <code class="charname">LESS-THAN SIGN</code>) character which is not part
321        of any markup appears in the input stream.</p>
322    
323        <p>The <code>&lt;</code> character as a data character must
324        be escaped as:
325        <pre class="html example"><code>&amp;lt;</code></pre>
326        </p>
327      </d:desc>
328    </d:item>
329    
330    <d:item name="bare nero"
331        class="tokenize-error"
332        modules="HTML::Parser">
333      <d:message xml:lang="en">The decimal representation of the code position
334      of a character must be specified after <code>&amp;#</code>.</d:message>
335      <d:desc xml:lang="en">
336        <p>An <code>&amp;</code> (<code>U+0026</code>
337        <code class="charname">AMPERSAND</code>) character immediately
338        followed by a <code>#</code> (<code>U+0023</code>
339        <code>NUMBER SIGN</code>) character which
340        is not part of any reference appears in the input stream.
341      The document is non-conforming.</p>      The document is non-conforming.</p>
342    
343        <p>The string <code>&amp;#</code> must be the first two characters
344        of a reference:
345          <dl class="switch">
346          <dt>Numeric character reference</dt>
347              <dd><pre class="html example"><code>&amp;#<var>d</var>;</code></pre>
348              where <var>d</var> is the decimal representation of
349              the code point of the character to be referenced.</dd>
350          <dt>Hexadecimal character reference</dt>
351              <dd><pre class="html example"><code>&amp;#x<var>h</var>;</code></pre>
352              where <var>h</var> is the hexadecimal representation
353              of the code point of the character to be referenced.</dd>
354          </dl>
355        </p>
356    
357        <p>To represent <code>&amp;#</code> as data characters, use
358        a named entity reference for the <code>&amp;</code> character:
359          <pre class="html example"><code>&amp;amp;#</code></pre>
360        </p>
361      </d:desc>
362    </d:item>
363    
364    <d:item name="bare hcro"
365        class="tokenize-error"
366        modules="HTML::Parser">
367      <d:message xml:lang="en">The hexadecimal representation of the code position
368      of a character must be specified after <code>&amp;#x</code>.</d:message>
369      <d:desc xml:lang="en">
370       <p>The string <code>&amp;#x</code> or <code>&amp;#X</code> which
371       is not part of any reference appears in the input stream.
372        The document is non-conforming.</p>
373    
374        <p>The string <code>&amp;#x</code> or <code>&amp;#X</code> must
375        be the first three characters of a hexadecimal reference:
376          <pre class="html example"><code>&amp;#x<var>h</var>;</code></pre>
377        where <var>h</var> is the hexadecimal representation
378        of the code point of the character to be referenced.</p>
379    
380        <p>To represent <code>&amp;#x</code> as data characters, use
381        a named entity reference for the <code>&amp;</code> character:
382          <pre class="html example"><code>&amp;amp;#x</code></pre>
383        </p>
384      </d:desc>
385    </d:item>
386    
387    <d:item name="bogus comment"
388        class="tokenize-error"
389        modules="HTML::Parser">
390      <d:message xml:lang="en">String <code>&lt;!</code> is not followed
391      by <code>--</code>.</d:message>
392      <d:desc xml:lang="en">
393        <p>There is a <code>&lt;</code> (<code>U+003C</code>
394        <code class="charname">LESS-THAN SIGN</code>) character
395        followed by a <code>!</code> (<code>U+0021</code>
396        <code class="charname">EXCLAMATION MARK</code>) character,
397        which is not followed by a <code>--</code> or
398        <code>!DOCTYPE</code>.  The document is non-conforming.</p>
399    
400        <dl class="switch">
401        <dt>Comments</dt>
402          <dd>In HTML document, comments must be introduced by
403          <code class="example">&lt;!--</code> (<code>&lt;!</code>
404          <em>immediately</em> followed
405          by <em>two</em> <code>-</code>s) and must be terminated by
406          <code class="example">--></code>.
407          Strings <code>&lt;!</code> not followed
408          by <code>--</code> and <code>&lt;!-</code> not followed by
409          <code>-</code> are not valid open delimiters for comments.</dd>
410        <dt>Marked sections, including <code>CDATA</code> sections</dt>
411          <dd>Marked sections are not allowed in HTML document.</dd>
412        <dt>Markup declarations</dt>
413          <dd>Markup declarations, except for <code>DOCTYPE</code>
414          and comment declarations, are not allowed in HTML document.</dd>
415        <dt>String <code>&lt;!</code></dt>
416          <dd>String <code>&lt;!</code> must be escaped as
417          <code class="example">&amp;lt;!</code>.</dd>
418        </dl>
419      </d:desc>
420    </d:item>
421    
422    <d:item name="bogus end tag"
423        class="tokenize-error"
424        modules="HTML::Parser">
425      <d:message xml:lang="en">String <code>&lt;/</code> is not followed
426      by tag name.</d:message><!-- </ non-name-start-char-non-EOF -->
427      <d:desc xml:lang="en">
428        <p>There is a <code>&lt;</code> (<code>U+003C</code>
429        <code class="charname">LESS-THAN SIGN</code>) character
430        immediately followed by a <code>/</code> (<code>U+005F</code>
431        <code>SOLIDUS</code>) character, which is not part
432        of any end tag, in the input stream.  The document
433        is non-conforming.</p>
434    
435        <p>The <code>&lt;/</code> sequence not followed by a
436        tag name is parsed as an opening of bogus comment.</p>
437    
438        <p>The <code>&lt;/</code> sequence as string data must
439        be escaped as:
440        <pre class="html example"><code>&amp;lt;/</code></pre>
441        </p>
442      </d:desc>
443    </d:item>
444    
445    <d:item name="C1 character reference"
446        class="tokenize-error"
447        modules="HTML::Parser">
448      <d:message xml:lang="en">Character reference to
449      <code><var>{text}</var></code> is not allowed.</d:message>
450    </d:item>
451    
452    <d:item name="CR character reference"
453        class="tokenize-error"
454        modules="HTML::Parser">
455      <d:message xml:lang="en">Character reference to
456      <code>U+000D</code> (<code class="charname">CARRIAGE RETURN</code>)
457      is not allowed.</d:message>
458    </d:item>
459    
460    <d:item name="dash in comment"
461        class="tokenize-error"
462        modules="HTML::Parser">
463      <d:message xml:lang="en">There is a <code>--</code> sequence
464      in a comment.</d:message>
465      <d:desc xml:lang="en">
466        <p>There is a <code>-</code> (<code>U+002D</code>
467        <code class="charname">HYPHEN-MINUS</code>) character
468        at the end of the comment or a <code>--</code> sequence
469        in the comment.  The document is non-conforming.</p>
470    
471        <p>Comments cannot contain a string <code>--</code>, as in XML.
472        Unlike SGML, there cannot be more than one comments
473        (where <i>comment</i> is an SGML term) in the comment
474        declaration.</p>
475    </d:desc>    </d:desc>
476  </d:item>  </d:item>
477    
478  <d:item name="duplicate attribute"  <d:item name="duplicate attribute"
479      class="tokenize-error">      class="tokenize-error"
480    <d:message xml:lang="en">There are two attributes with same name.</d:message>      modules="HTML::Parser">
481      <d:message xml:lang="en">There are two attributes with name
482          <code><var>{text}</var></code>.</d:message>
483    <d:desc xml:lang="en">    <d:desc xml:lang="en">
484      <p>Attributes must be unique in an element.  Specifying      <p>There are more than one attributes with the same
485      attributes with same name more than once is non-conforming.</p>      name in a tag.  The document is non-conforming.</p>
486    
487      <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.
488      Use <code>img</code> element with animation GIF instead.</p>      Use <code>img</code> element with animation GIF instead.</p>
489    </d:desc>    </d:desc>
490  </d:item>  </d:item>
491    
492    <d:item name="empty start tag"
493        class="tokenize-error"
494        modules="HTML::Parser">
495      <d:message xml:lang="en">Empty start tag (<code>&lt;></code>) is not
496      allowed.</d:message>
497    </d:item>
498    
499    <d:item name="empty end tag"
500        class="tokenize-error"
501        modules="HTML::Parser">
502      <d:message xml:lang="en">Empty end tag (<code>&lt;/></code>) is not
503      allowed.</d:message>
504    </d:item>
505    
506    <d:item name="end tag attribute"
507        class="tokenize-error"
508        modules="HTML::Parser">
509      <d:message xml:lang="en">End tag cannot have attributes.</d:message>
510    </d:item>
511    
512    <d:item name="invalid character reference"
513        class="tokenize-error"
514        modules="HTML::Parser">
515      <d:message xml:lang="en">Character reference to
516      <code><var>{text}</var></code> is not allowed.</d:message>
517    </d:item>
518    
519  <d:item name="nestc"  <d:item name="nestc"
520      class="tokenize-error">      class="tokenize-error"
521    <d:message xml:lang="en">Void element syntax (<code>/></code>) cannot be      modules="HTML::Parser">
522      <d:message xml:lang="en">Polytheistic slash (<code>/></code>) cannot be
523    used for this element.</d:message>    used for this element.</d:message>
524    <d:desc xml:lang="en">    <d:desc xml:lang="en">
525      <p>The void element syntax <code>/></code> syntax can only be      <p>Polytheistic slash (<code>/></code>) must not be used
526        for the element.  The document is non-conforming.</p>
527    
528        <p>The polytheistic slash can only be
529      used for <code>base</code>, <code>link</code>, <code>meta</code>,      used for <code>base</code>, <code>link</code>, <code>meta</code>,
530      <code>hr</code>, <code>br</code>, <code>img</code>,      <code>hr</code>, <code>br</code>, <code>img</code>,
531      <code>embed</code>, <code>param</code>, <code>area</code>,      <code>embed</code>, <code>param</code>, <code>area</code>,
532      <code>col</code>, and <code>input</code> elements.      <code>col</code>, and <code>input</code> elements.</p>
     For any other elements, using that syntax is non-conforming.</p>  
533    
534      <p>Unlike XML, the void element syntax (<code>/></code>) has      <dl class="switch">
535        <dt><code>&lt;script/></code></dt>
536            <dd><p>The polytheistic slash cannot be used for <code>script</code>
537            element.  Even for an empty <code>script</code> element,
538            there must be an explicit end tag
539            <code class="html example">&lt;/script></code>.</p>
540    
541            <p><strong>NOTE</strong>: Though some user agents interpret
542            polytheistic slash for <code>script</code> element as the
543            closing of the element, such usage is not allowed under
544            the current standard.</p></dd>
545        <dt><code>&lt;basefont/></code>, <code>&lt;bgsound/></code>,
546        <code>&lt;frame/></code>, <code>&lt;keygen/></code>,
547        <code>&lt;spacer/></code>, <code>&lt;wbr/></code></dt>
548            <dd>These elements are themselves non-conforming.</dd>
549        <!-- isindex, image -->
550        <dt><code>&lt;command/></code>, <code>&lt;event-source/></code>,
551        <code>&lt;nest/></code>, or <code>&lt;source/></code></dt>
552            <dd>Future revision of HTML5 parsing algorithm is expected
553            to allow polytheistic slash for these elements.</dd>
554        <dt><code>&lt;a/></code>, <code>&lt;p/></code></dt>
555            <dd>These elements are not always empty and therefore
556            polytheistic slash is not allowed.  Use explicit end tag
557            to represent empty element as:
558              <pre class="example html"><code>&lt;p>&lt;/p></code></pre>
559            </dd>
560        </dl>
561    
562        <p>Note that, unlike in XML, the polytheistic slash has
563      no effect in HTML.</p>      no effect in HTML.</p>
564    </d:desc>    </d:desc>
565  </d:item>  </d:item>
566    
567    <d:item name="no DOCTYPE name"
568        class="tokenize-error"
569        modules="HTML::Parser">
570      <d:message xml:lang="en">After the string <code>&lt;!DOCTYPE </code>, the
571      document type name must be specified.</d:message>
572    </d:item>
573    
574    <d:item name="no PUBLIC literal"
575        class="tokenize-error"
576        modules="HTML::Parser">
577      <d:message xml:lang="en">After the keyword <code>PUBLIC</code>, no
578      oublic identifier is specified.</d:message>
579    </d:item>
580    
581    <d:item name="no refc"
582        class="tokenize-error"
583        modules="HTML::Parser">
584      <d:message xml:lang="en">Character reference must be closed by a
585      <code>;</code> character.</d:message>
586    </d:item>
587    
588    <d:item name="no space before DOCTYPE name"
589        class="tokenize-error"
590        modules="HTML::Parser">
591      <d:message xml:lang="en">After the string <code>&lt;!DOCTYPE</code>, there
592      must be at least a white space character before the document type
593      name.</d:message>
594    </d:item>
595    
596    <d:item name="no space between attributes"
597        class="tokenize-error"
598        modules="HTML::Parser">
599      <d:message xml:lang="en">Attributes must be separeted by at least a
600      white space character.</d:message>
601    </d:item>
602    
603    <d:item name="no SYSTEM literal"
604        class="tokenize-error"
605        modules="HTML::Parser">
606      <d:message xml:lang="en">After the keyword <code>SYSTEM</code>, no
607      system identifier is specified.</d:message>
608    </d:item>
609    
610    <d:item name="pio"
611        class="tokenize-error"
612        modules="HTML::Parser">
613      <d:message xml:lang="en">Processing instruction
614      (<code>&lt;?<var>...</var>></code>) is not allowed in HTML
615      document.</d:message>
616      <d:desc xml:lang="en">
617        <p>Processing instructions (<code>&lt;?<var>...</var>?></code>),
618        including XML declaration (<code>&lt;?xml <var>...</var>?></code>)
619        and XML style sheet <abbr title="processing instruction">PI</abbr>
620        (<code>&lt;?xml-stylesheet <var>...</var>?></code>), are not allowed
621        in the HTML syntax.  The document is non-conforming.</p>
622    
623        <dl class="switch">
624        <dt><code>&lt;?xbl?></code> (<abbr>XBL</abbr> Association)</dt>
625          <dd>An <abbr>XBL</abbr> binding cannot be associated by
626          <abbr title="processing instruction">PI</abbr> in <abbr>HTML</abbr>
627          document.  Use <code>binding</code> property in <abbr>CSS</abbr>
628          style sheet as:
629            <pre class="html example"><code>&lt;style>
630    p {
631      binding: url(binding.xbl);
632    }
633    &lt;/style></code></pre>
634          </dd>
635        <dt><code>&lt;?xml?&gt;</code> (XML declaration)</dt>
636            <dd>XML declaration is unnecessary for HTML documents.</dd>
637        <dt><code>&lt;?xml-stylesheet?></code> (XML style sheet
638        <abbr title="processing instruction">PI</abbr>)</dt>
639            <dd>Use HTML <code>link</code> element with <code>rel</code>
640            attribute set to <code>stylesheet</code> (or,
641            <code>alternate stylesheet</code> for an alternate style
642            sheet).
643              <pre class="example html"><code>&lt;link rel=stylesheet href="path/to/stylesheet.css"></code></pre>
644            </dd>
645        <dt><code>&lt;?php?&gt;</code> or
646        <code>&lt;? <var>... <abbr>PHP</abbr> code ...</var> ?&gt;</code>
647        (<abbr>PHP</abbr> code)</dt>
648            <dd>The conformance checker does <em>not</em> support
649            checking for PHP source documents.</dd>
650        <dt>Other processing instructions</dt>
651            <dd>Processing instructions cannot be inserted in an HTML
652            document.  Use XML document or insert
653            <code>ProcessingInstruction</code> node by scripting.</dd>
654        </dl>
655    
656        <p>Web browsers will parse processing instructions as bogus
657        comments.  Some legacy Web browsers, such as IE:mac and
658        some mobile Web browsers, will display processing instructions
659        as string.</p>
660      </d:desc>
661    </d:item>
662    
663    <d:item name="string after DOCTYPE name"
664        class="tokenize-error"
665        modules="HTML::Parser">
666      <d:message xml:lang="en">There is a bogus string after the document type
667      name.</d:message>
668    </d:item>
669    
670    <d:item name="string after PUBLIC"
671        class="tokenize-error"
672        modules="HTML::Parser">
673      <d:message xml:lang="en">There is a bogus string after the keyword
674      <code>PUBLIC</code>.</d:message>
675    </d:item>
676    
677    <d:item name="string after PUBLIC literal"
678        class="tokenize-error"
679        modules="HTML::Parser">
680      <d:message xml:lang="en">There is a bogus string after the public
681      identifier.</d:message>
682    </d:item>
683    
684    <d:item name="string after SYSTEM"
685        class="tokenize-error"
686        modules="HTML::Parser">
687      <d:message xml:lang="en">There is a bogus string after the keyword
688      <code>SYSTEM</code>.</d:message>
689    </d:item>
690    
691    <d:item name="string after SYSTEM literal"
692        class="tokenize-error"
693        modules="HTML::Parser">
694      <d:message xml:lang="en">There is a bogus string after the system
695      identifier.</d:message>
696    </d:item>
697    
698    <d:item name="unclosed attribute value"
699        class="tokenize-error"
700        modules="HTML::Parser">
701      <d:message xml:lang="en">Attribute value is not closed by a quotation
702      mark.</d:message>
703    </d:item>
704    
705    <d:item name="unclosed comment"
706        class="tokenize-error"
707        modules="HTML::Parser">
708      <d:message xml:lang="en">Comment is not closed by a string
709      <code>--></code>.</d:message>
710    </d:item>
711    
712    <d:item name="unclosed DOCTYPE"
713        class="tokenize-error"
714        modules="HTML::Parser">
715      <d:message xml:lang="en">The <code>DOCTYPE</code> is not closed by a
716      <code>></code> character.</d:message>
717    </d:item>
718    
719    <d:item name="unclosed PUBLIC literal"
720        class="tokenize-error"
721        modules="HTML::Parser">
722      <d:message xml:lang="en">The public identifier literal is not closed by a
723      quotation mark.</d:message>
724    </d:item>
725    
726    <d:item name="unclosed SYSTEM literal"
727        class="tokenize-error"
728        modules="HTML::Parser">
729      <d:message xml:lang="en">The system identifier literal is not closed by a
730      quotation mark.</d:message>
731    </d:item>
732    
733    <d:item name="unclosed tag"
734        class="tokenize-error"
735        modules="HTML::Parser">
736      <d:message xml:lang="en">Tag is not closed by a <code>></code>
737      character.</d:message>
738    </d:item>
739    
740    </section>
741    
742    <section id="html5-parse-errors">
743    <h2>HTML5 Parse Errors in Tree Construction Stage</h2>
744    
745    <d:item name="after body"
746        class="parse-error"
747        modules="HTML::Parser">
748      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>></code> is
749      not allowed after the <code>body</code> is closed.</d:message>
750    </d:item>
751    
752    <d:item name="after body:/"
753        class="parse-error"
754        modules="HTML::Parser">
755      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>></code> is
756      not allowed after the <code>body</code> is closed.</d:message>
757    </d:item>
758    
759    <d:item name="after body:#text"
760        class="parse-error"
761        modules="HTML::Parser">
762      <d:message xml:lang="en">Non‐white‐space characters are not allowed
763      after the <code>body</code> is closed.</d:message>
764    </d:item>
765    
766    <d:item name="after frameset"
767        class="parse-error"
768        modules="HTML::Parser">
769      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>></code> is
770      not allowed after the <code>frameset</code> is closed.</d:message>
771    </d:item>
772    
773    <d:item name="after frameset:/"
774        class="parse-error"
775        modules="HTML::Parser">
776      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>></code> is
777      not allowed after the <code>frameset</code> is closed.</d:message>
778    </d:item>
779    
780    <d:item name="after frameset:#text"
781        class="parse-error"
782        modules="HTML::Parser">
783      <d:message xml:lang="en">Non‐white‐space characters are not allowed
784      after the <code>frame</code> is closed.</d:message>
785    </d:item>
786    
787    <d:item name="after head"
788        class="parse-error">
789      <d:message xml:lang="en">The <code><var>{text}</var></code> element cannot be
790      inserted between <code>head</code> and <code>body</code>
791      elements.</d:message>
792      <d:desc xml:lang="en">
793        <p>A start tag appears after the <code>head</code> element is closed
794        but before the <code>body</code> element is opened.
795        The document is non-conforming.</p>
796      </d:desc>
797    </d:item>
798    
799    <d:item name="after html"
800        class="parse-error"
801        modules="HTML::Parser">
802      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>></code> is
803      not allowed after the <code>html</code> is closed.</d:message>
804    </d:item>
805    
806    <d:item name="after html:/"
807        class="parse-error"
808        modules="HTML::Parser">
809      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>></code> is
810      not allowed after the <code>html</code> is closed.</d:message>
811    </d:item>
812    
813    <d:item name="after html:#text"
814        class="parse-error"
815        modules="HTML::Parser">
816      <d:message xml:lang="en">Non‐white‐space characters are not allowed
817      after the <code>html</code> is closed.</d:message>
818    </d:item>
819    
820    <d:item name="image"
821        class="parse-error"
822        modules="HTML::Parser">
823      <d:message xml:lang="en">The <code>image</code> element is
824      obsolete.</d:message>
825    </d:item>
826    
827    <d:item name="in a:a"
828        class="parse-error"
829        modules="HTML::Parser">
830      <d:message xml:lang="en">Anchor cannot be nested.</d:message>
831      <d:desc xml:lang="en">
832        <p>HTML <code>a</code> elements cannot be nested.
833        The document is non-conforming.</p>
834    
835        <p>In the HTML syntax, a start tag of the <code>a</code>
836        implies the end tag of any opening <code>a</code> element.</p>
837      </d:desc>
838    </d:item>
839    
840    <d:item name="in body"
841        class="parse-error"
842        modules="HTML::Parser">
843      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>&gt;</code>
844      is not allowed in the <code>body</code> element.</d:message>
845      <d:desc xml:lang="en">
846        <p>The start or end tag of an element, which
847        cannot be a descendant of <code>body</code> element, appears
848        in the input stream while the <code>body</code> element has been opened.
849        The document is non-conforming.</p>
850      </d:desc>
851    </d:item>
852    
853    <d:item name="in body:#eof"
854        class="parse-error"
855        modules="HTML::Parser">
856      <d:message xml:lang="en">Some element is not closed before the end of
857      file.</d:message>
858    </d:item>
859    
860    <d:item name="in button:button"
861        class="parse-error"
862        modules="HTML::Parser">
863      <d:message xml:lang="en">The <code>button</code> element cannot be
864      nested.</d:message>
865    </d:item>
866    
867    <d:item name="in CDATA:#eof"
868        class="parse-error"
869        modules="HTML::Parser">
870      <d:message xml:lang="en">Element is not closed before the end of
871      file.</d:message>
872    </d:item>
873    
874    <d:item name="in form:form"
875        class="parse-error"
876        modules="HTML::Parser">
877      <d:message xml:lang="en">Start tag <code>&lt;form></code> is
878      not allowed in a <code>form</code> element.</d:message>
879    </d:item>
880    
881    <d:item name="in frameset"
882        class="parse-error"
883        modules="HTML::Parser">
884      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>></code> is
885      not allowed in a <code>framset</code> element.</d:message>
886    </d:item>
887    
888    <d:item name="in frameset:/"
889        class="parse-error"
890        modules="HTML::Parser">
891      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>></code> is
892      not allowed in a <code>frameset</code> element.</d:message>
893    </d:item>
894    
895    <d:item name="in frameset:#text"
896        class="parse-error"
897        modules="HTML::Parser">
898      <d:message xml:lang="en">Non‐white‐space characters are not allowed
899      in a <code>frameset</code> element.</d:message>
900    </d:item>
901    
902    <d:item name="in head:head"
903        class="parse-error"
904        modules="HTML::Parser">
905      <d:message xml:lang="en">Start tag <code>&lt;head&gt;</code>
906      is not allowed in the <code>head</code> element.</d:message>
907      <d:desc xml:lang="en">
908        <p>There is a start tag <code>&lt;head></code> in the
909        <code>&lt;head></code> element.  The document is non-conforming.</p>
910    
911        <p>In an HTML document there must not be more than
912        one <code>head</code> element, therefore no more than one
913        start tag <code>&lt;head></code> can appear in the input stream.</p>
914      </d:desc>
915    </d:item>
916    
917    <d:item name="in html:#DOCTYPE"
918        class="parse-error"
919        modules="HTML::Parser">
920      <d:message xml:lang="en">A <code>DOCTYPE</code> appears after any
921      element or data character has been seen.</d:message>
922      <!-- <!DOCTYPE HTML><!DOCTYPE HTML> -->
923      <!-- <html><!DOCTYPE HTML> -->
924      <d:desc xml:lang="en">
925        <p>A <code>DOCTYPE</code> appears after any element or data character
926        has been seen.  The document is non-conforming.</p>
927        
928        <p>The <code>DOCTYPE</code> must be placed before any
929        tag, reference, or data character.  Only white space characters
930        and comments can be inserted before the <code>DOCTYPE</code>.</p>
931      </d:desc>
932    </d:item>
933    
934    <d:item name="in nobr:nobr"
935        class="parse-error"
936        modules="HTML::Parser">
937      <d:message xml:lang="en">The <code>nobr</code> element cannot be
938      nested.</d:message>
939    </d:item>
940    
941    <d:item name="in noscript"
942        class="parse-error"
943        modules="HTML::Parser">
944      <d:message xml:lang="en">The <code><var>{text}</var></code> element is not
945      allowed in a <code>noscript</code> element in the
946      <code>head</code> element.</d:message>
947    </d:item>
948    
949    <d:item name="in noscript:/"
950        class="parse-error"
951        modules="HTML::Parser">
952      <d:message xml:lang="en">An end tag <code>&lt;/<var>{text}</var>></code>
953      appers before the <code>noscript</code> element is closed.</d:message>
954    </d:item>
955    
956    <d:item name="in noscript:#eof"
957        class="parse-error"
958        modules="HTML::Parser">
959      <d:message xml:lang="en">A <code>noscript</code> element is not closed
960      before the end of file.</d:message>
961    </d:item>
962    
963    <d:item name="in noscript:#text"
964        class="parse-error"
965        modules="HTML::Parser">
966      <d:message xml:lang="en">Non‐white‐space characters are not allowed
967      in a <code>noscript</code> element in the <code>head</code>
968      element.</d:message>
969    </d:item>
970    
971    <d:item name="in PCDATA:#eof"
972        class="parse-error"
973        modules="HTML::Parser">
974      <d:message xml:lang="en">Element is not closed before the end of
975      file.</d:message>
976    </d:item>
977    
978    <d:item name="in select"
979        class="parse-error"
980        modules="HTML::Parser">
981      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>&gt;</code>
982      is not allowed in a <code>select</code> element.</d:message>
983    </d:item>
984    
985    <d:item name="in select:/"
986        class="parse-error"
987        modules="HTML::Parser">
988      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>&gt;</code>
989      is not allowed in a <code>select</code> element.</d:message>
990    </d:item>
991    
992    <d:item name="in table"
993        class="parse-error"
994        modules="HTML::Parser">
995      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>&gt;</code>
996      is not allowed in a <code>table</code> element.</d:message>
997      <d:desc xml:lang="en">
998        <p>The start or end tag of an element, which
999        cannot be a child of <code>table</code> element, appears
1000        in the input stream while the <code>table</code> element has been opened
1001        but no other element has been opened.  The document is non-conforming.</p>
1002    
1003        <p>In <code>table</code>, only table related elements
1004        are allowed; any other element must be contained in
1005        <code>td</code> or <code>th</code> element to form
1006        a part of the table, or <code>caption</code> element to create
1007        a table caption.</p>
1008      </d:desc>
1009    </d:item>
1010    
1011    <d:item name="in table:/"
1012        class="parse-error"
1013        modules="HTML::Parser">
1014      <d:message xml:lang="en">End tag <code>&lt;/<var>{text}</var>&gt;</code>
1015      is not allowed in a <code>table</code> element.</d:message>
1016    </d:item>
1017    
1018    <d:item name="in table:#text"
1019        class="parse-error"
1020        modules="HTML::Parser">
1021      <d:message xml:lang="en">Non‐white‐space character is not allowed within
1022      the <code>table</code> element, outside of the caption and cells.</d:message>
1023      <d:desc xml:lang="en">
1024        <p>A non‐white‐space character appears in <code>table</code>.
1025        The document is non-conforming.</p>
1026    
1027        <p>In <code>table</code>, only table related elements
1028        are allowed; any other element and data character must be contained in
1029        <code>td</code> or <code>th</code> element to form
1030        a part of the table, or <code>caption</code> element to create
1031        a table caption.</p>
1032      </d:desc>
1033    </d:item>
1034    
1035    <d:item name="isindex"
1036        class="parse-error"
1037        modules="HTML::Parser">
1038      <d:message xml:lang="en">The <code>isindex</code> element is
1039      obsolete.</d:message>
1040    </d:item>
1041    
1042    <d:item name="missing start tag:tr"
1043        class="parse-error"
1044        modules="HTML::Parser">
1045      <d:message xml:lang="en">Start tag of <code>tr</code>
1046      element is missing.</d:message>
1047      <d:desc>
1048        <p>Start tag of a <code>tr</code> element, which is <em>not</em>
1049        optional, is missing.  The document is non-conforming.</p>
1050    
1051        <p>In a table section, a <code>&lt;tr></code> start tag
1052        must occur before any <code>&lt;td></code> or
1053        <code>&lt;th></code> start tag.  Though the HTML5 parser
1054        implies the <code>&lt;tr></code> start tag before
1055        these start tags, it must be explicitly specified.</p>
1056      </d:desc>
1057    </d:item>
1058    
1059    <d:item name="no DOCTYPE"
1060        class="parse-error"
1061        modules="HTML::Parser">
1062      <d:message xml:lang="en">This document does not start with a
1063      <code>DOCTYPE</code>.</d:message>
1064      <d:desc>
1065        <p>The document does not start with a <code>DOCTYPE</code>.
1066        The document is non-conforming.</p>
1067    
1068        <p>An HTML document must start by a <code>DOCTYPE</code>:
1069          <pre class="html example"><code>&lt;!DOCTYPE HTML></code></pre>
1070        </p>
1071    
1072        <p>Only white space characters and comments are allowed
1073        before the <code>DOCTYPE</code>.  XML declaration is <em>not</em>
1074        allowed in HTML document.</p>
1075      </d:desc>
1076    </d:item>
1077    
1078    <d:item name="not closed"
1079        class="parse-error"
1080        modules="HTML::Parser">
1081      <d:message xml:lang="en">Element <code><var>{text}</var></code> is not
1082      closed.</d:message>
1083      <d:desc>
1084        <p>End tag of an element is not found before, for example,
1085        an end tag of another element appears or
1086        the end of the document.  The document is non-conforming.</p>
1087    
1088        <p>Only <code>body</code>, <code>colgroup</code>, <code>dd</code>,
1089        <code>dt</code>, <code>head</code>, <code>html</code>, <code>li</code>,
1090        <code>ol</code>, <code>option</code>, <code>optgroup</code>,
1091        <code>p</code>, <code>rb</code>, <code>rp</code>, <code>rt</code>,
1092        <code>tbody</code>, <code>td</code>, <code>tfoot</code>,
1093        <code>th</code>, <code>thead</code>, <code>tr</code>,
1094        <code>ul</code> end tag can be omitted in HTML documents.
1095        For any element except for void element, there must be an explicit
1096        end tag.</p>
1097    
1098        <dl class="switch">
1099        <dt>HTML <code>canvas</code> element</dt>
1100          <dd>Though the element is void in earlier versions of Safari,
1101          the <code>canvas</code> element is <em>no</em> longer
1102          defined as empty.  There must be an end tag
1103          <code class="html example">&lt;/canvas></code>.</dd>
1104        </dl>
1105    
1106        <p>Note that misnesting tags, such as
1107        <code class="bad example">&lt;a>&lt;b>&lt;/a>&lt;/b></code>, are not
1108        allowed and they also cause this error.</p>
1109      </d:desc>
1110    </d:item>
1111    
1112    <d:item name="not first start tag"
1113        class="parse-error"
1114        modules="HTML::Parser">
1115      <d:message xml:lang="en">This <code>&lt;html></code> tag is not
1116      the first start tag.</d:message>
1117      <d:desc>
1118        <p>There is a start tag of the <code>html</code> element
1119        that it not the first start tag in the input stream.
1120        The document is non-conforming.</p>
1121    
1122        <p>In an HTML document, there cannot be more than one
1123        <code>html</code> element and therefore there cannot be
1124        more than one <code>&lt;html></code> tag.  In addition,
1125        nothing can be placed before the <code>&lt;html></code> tag
1126        except a <code>DOCTYPE</code>, white space characters,
1127        and comments.</p>
1128      </d:desc>
1129    </d:item>
1130    
1131    <d:item name="not HTML5"
1132        class="parse-error"
1133        modules="HTML::Parser">
1134      <d:message xml:lang="en">This document is written in an old version of
1135      HTML.</d:message>
1136      <d:desc xml:lang="en">
1137        <p>The document contains a <code>DOCTYPE</code> declaration
1138        that is different from HTML5 <code>DOCTYPE</code> (i.e.
1139        <code class="example html">&lt;!DOCTYPE HTML&gt;</code>).
1140        The document is non‐conforming.</p>
1141    
1142        <p>The document might or might not be conformant to
1143        some version of HTML.  However, conformance to any HTML
1144        specification other than HTML5 provides for no practical
1145        convenience, since Web borwsers will parse any
1146        HTML document (roughly) as defined in HTML5.</p>
1147      </d:desc>
1148    </d:item>
1149    
1150    <d:item name="start tag not allowed"
1151        class="parse-error"
1152        modules="HTML::Parser">
1153      <d:message xml:lang="en">Start tag <code>&lt;<var>{text}</var>></code> is
1154      not allowed here.</d:message>
1155    </d:item>
1156    
1157    <d:item name="unmatched end tag"
1158        class="parse-error"
1159        modules="HTML::Parser">
1160      <d:message xml:lang="en">Element <code><var>{text}</var></code> is not
1161      opened.</d:message>
1162      <d:desc>
1163        <p>An end tag appears though no element with the same name
1164        has been opened.  The document is non-conforming.</p>
1165    
1166        <p>For any end tag in HTML document, there must be a
1167        corresponding start tag.</p>
1168    
1169        <dl class="switch">
1170        <dt>HTML <code>base</code>, <code>basefont</code>,
1171        <code>bgsound</code>, <code>br</code>, <code>col</code>,
1172        <code>embed</code>, <code>frame</code>, <code>hr</code>,
1173        <code>image</code>, <code>img</code>, <code>input</code>,
1174        <code>isindex</code>, <code>link</code>, <code>meta</code>,
1175        <code>param</code>, <code>spacer</code>, or <code>wbr</code> element</dt>
1176          <dd>End tag is not allowed for these elements, since
1177          those content must always be empty.  Remove end tag.</dd>
1178        <!-- keygen -->
1179        <!-- command, event-source, nest, source -->
1180        </dl>
1181      </d:desc>
1182    </d:item>
1183    
1184  </section>  </section>
1185    
1186  <section id="element-content-model-errors">  <section id="element-content-model-errors">
1187  <h2>Element Content Model Errors</h2>  <h2>Element Content Model Errors</h2>
1188    
1189    <d:item name="basehref after URL attribute"
1190        modules="ContentChecker::HTML">
1191      <d:message xml:lang="en">The <code>base</code> element with the
1192      <code>href</code> attribute specified cannot be placed after
1193      any attribute with a URL.</d:message>
1194    </d:item>
1195    
1196    <d:item name="basetarget after hyperlink"
1197        modules="ContentChecker::HTML">
1198      <d:message xml:lang="en">The <code>base</code> element with the
1199      <code>target</code> attribute specified cannot be placed after
1200      any element that defines a hyperlink.</d:message>
1201    </d:item>
1202    
1203  <d:item name="character not allowed"  <d:item name="character not allowed"
1204      class="content-model-error">      modules="ContentChecker::HTML RDFXML">
1205    <d:message xml:lang="en">Data character is not allowed in this    <d:message xml:lang="en">Data character is not allowed in this
1206    context.</d:message>    context.</d:message>
1207    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1208      <p>A data character occurs where it is not allowed in this      <p>A data character appears where it is not allowed in this
1209      context.  The document is non-conforming.</p>      context.  The document is non-conforming.</p>
1210    
1211      <p>Possible causes:      <p>Possible causes:
1212        <dl>        <ul>
1213        <dt>If the erred element is an inline-level element (such        <li><p>A data character cannot be a child
1214        as <code>a</code> or <code>span</code>)</dt>        of certain sectioning elements such as <code>body</code>,
1215            <dd><p>A data character cannot be a child        <code>section</code>, and <code>blockquote</code>.</p>
1216            of certain sectioning elements such as <code>body</code>,  
1217            <code>section</code>, and <code>blockquote</code>.</p>        <p>Any inline-level content must be put
1218          in e.g. paragraph element such as <code>p</code>.</p></li>
1219            <p>Any inline-level content must be put        <li><p>Though some elements such as <code>div</code>,
1220            in e.g. paragraph element such as <code>p</code>.</p></dd>        <code>li</code>, and <code>td</code> allow
1221        <dt>If the erred element is a block-level element (such as        <em>either one</em> of block-level or inline-level content
1222        <code>div</code> or <code>h<var>n</var></code>)</dt>        is allowed.  If there is a block-level content,
1223            <dd><p>Though some elements such as <code>div</code>,        any inline-level content must be put
1224            <code>li</code>, and <code>td</code> allow        in e.g. paragraph element such as <code>p</code>.</p></li>
1225            <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>  
1226      </p>      </p>
1227    </d:desc>    </d:desc>
1228  </d:item>  </d:item>
1229    
1230    <d:item name="character not allowed:empty"
1231        modules="ContentChecker::HTML">
1232      <d:message xml:lang="en">Non‐white‐space characters are not allowed in
1233      an empty element.</d:message>
1234    </d:item>
1235    
1236    <d:item name="character not allowed:atom|PersonConstruct"
1237        modules="ContentChecker::HTML">
1238      <d:message xml:lang="en">Non‐white‐space characters are not allowed in
1239      Person construct.</d:message>
1240    </d:item>
1241    
1242    <d:item name="character not allowed:atom|TextConstruct"
1243        modules="ContentChecker::HTML">
1244      <d:message xml:lang="en">Non‐white‐space characters are not allowed in
1245      Text construct.</d:message>
1246    </d:item>
1247    
1248  <d:item name="child element missing"  <d:item name="child element missing"
1249      class="content-model-error">      modules="ContentChecker::HTML ContentChecker::Atom">
1250    <d:message xml:lang="en">There must be a <code><var>$0</var></code>    <d:message xml:lang="en">There must be an element
1251    element as a child of this element.</d:message>    <code><var>{text}</var></code> as a child of this element.</d:message>
1252    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1253      <p>The content model of the element is so defined that it      <p>The content model of the element is so defined that it
1254      must contain a <code><var>$0</var></code> child element.      must contain a <code><var>$0</var></code> child element.
1255      Without such an element, the document is non-conforming.</p>      The document is non-conforming.</p>
1256    
1257      <p>For example:      <dl class="switch">
1258        <ul>      <dt>HTML <code>head</code> element</dt>
1259        <li>The <code>head</code> element must contain exactly one        <dd>There must be a <code>title</code> child element.</dd>
1260        <code>title</code> child element.</li>      <dt>HTML <code>html</code> element</dt>
1261        <li><a href="#child-element-missing:td%7Cth">The <code>tr</code>        <dd>There must be a <code>head</code> child element followed
1262        element must contain one or more <code>td</code> or <code>th</code>        by a <code>body</code> element.</dd>
1263        child element.</a></li>      <dt>HTML <code>tr</code> element</dt>
1264        </ul>        <dd><a href="#child-element-missing:td%7Cth">There must be
1265      </p>        one or more <code>td</code> or <code>th</code> child element.</a></dd>
1266        </dl>
1267    </d:desc>    </d:desc>
1268  </d:item>  </d:item>
1269    
# Line 117  Web Document Conformance Checker (BETA)< Line 1273  Web Document Conformance Checker (BETA)<
1273    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>
1274    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1275      <p>The <code>tr</code> element must contain at least one      <p>The <code>tr</code> element must contain at least one
1276      <code>td</code> or <code>th</code> child element.  Without      <code>td</code> or <code>th</code> child element.  The document
1277      such an element, the document is non-conforming.</p>      is non-conforming.</p>
1278    </d:desc>    </d:desc>
1279  </d:item>  </d:item>
1280    
1281    <d:item name="child element missing:atom"
1282        modules="ContentChecker::HTML">
1283      <d:message xml:lang="en">There must be an element
1284      <code><var>{text}</var></code> in the Atom namespace as a child of this
1285      element.</d:message>
1286    </d:item>
1287    
1288    <d:item name="child element missing:atom:link:alternate"
1289        modules="ContentChecker::HTML">
1290      <d:message xml:lang="en">There must be an Atom <code>link</code> element
1291      whose <code>rel</code> attribute is set to <code>alternate</code> as a
1292      child of this element.</d:message>
1293    </d:item>
1294    
1295    <d:item name="child element missing:atom:link:self"
1296        modules="ContentChecker::HTML">
1297      <d:message xml:lang="en">There should be an Atom <code>link</code> element
1298      whose <code>rel</code> attribute is set to <code>self</code> as a
1299      child of this element.</d:message>
1300    </d:item>
1301    
1302    <d:item name="element missing:hn"
1303        modules="ContentChecker::HTML">
1304      <d:message xml:lang="en">There must be at least one
1305      <code>h<var>n</var></code> element descendant.</d:message>
1306    </d:item>
1307    
1308  <d:item name="element not allowed"  <d:item name="element not allowed"
1309      class="content-model-error">      modules="ContentChecker::HTML ContentChecker::Atom RDFXML">
1310    <d:message xml:lang="en">This element is not allowed in this    <d:message xml:lang="en">This element is not allowed in this
1311    context.</d:message>    context.</d:message>
1312    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1313      <p>An element occurs where it is not allowed.  The document      <p>An element appears where it is not allowed.  The document
1314      is non-conforming.</p>      is non-conforming.</p>
1315    
1316      <p>Possible causes:      <p>Possible causes:
1317        <dl>        <dl class="switch">
1318        <dt>If the erred element is an inline-level element (such        <dt>If the element with the error is an inline-level element,
1319        as <code>a</code> or <code>span</code>)</dt>        such as <code>a</code>, <code>progress</code>, or <code>img</code></dt>
1320            <dd><p>An inline-level element cannot be a child            <dd><p>An inline-level element cannot be a child
1321            of certain sectioning elements such as <code>body</code>,            of certain sectioning elements such as <code>body</code>,
1322            <code>section</code>, and <code>blockquote</code>.</p>            <code>section</code>, and <code>blockquote</code>.</p>
1323    
1324            <p>Any inline-level content must be put            <p>Any inline-level content must be put
1325            in e.g. paragraph element such as <code>p</code>.</p></dd>            in e.g. paragraph element such as <code>p</code>.</p></dd>
1326        <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>,
1327        <code>div</code> or <code>h<var>n</var></code>)</dt>        <code>div</code>, <code>h<var>n</var></code>,
1328            <dd><p>Though some elements such as <code>div</code>,        <code>p</code>, or <code>section</code></dt>
1329            <code>li</code>, and <code>td</code> allow            <dd><dl class="switch">
1330            <em>either one</em> of block-level or inline-level content                <dt>If the parent element is <code>div</code>,
1331            is allowed.  If there is a block-level content,                <code>li</code>, <code>td</code>, or <code>th</code></dt>
1332            any inline-level content must be put                <!-- @@ TODO: more... -->
1333            in e.g. paragraph element such as <code>p</code>.</p></dd>                    <!-- @@ TODO: <p><ul><li><p> -->
1334        <dt>If the erred element is the root <code>html</code> element</dt>                    <dd><p>The parent element allows <em>either</em>
1335            <dd><p>In an XHTML document, the root <code>html</code>                    block-level or inline-level content.  If there is a
1336            element must have an <code>xmlns</code> attribute                    block-level content, any inline-level content must be
1337            whose value is set to                    put in e.g. paragraph element such as <code>p</code>.</p>
1338            <code>http://www.w3.org/1999/xhtml</code>.</p></dd>                    <p>For example, an HTML document fragment
1339                      <code class="html bad example">&lt;div>&lt;p>Hello!&lt;/p> World!&lt;/div></code>
1340                      is non-conforming, since a word <q>World!</q> does not belong
1341                      to any paragraph.  (If not part of any paragraph, what is
1342                      it!?)  A conforming example would be:
1343                        <pre class="html example"><code>&lt;div>&lt;p>Hello!&lt;/p> &lt;p>World!&lt;/p>&lt;/div></code></pre>
1344                      </p></dd>
1345                  <dt>If the parent element does <em>not</em> allow
1346                  block-level elements as content</dt>
1347                      <dd>The element is not allowed to be inserted here.
1348                      For example, a <code>div</code> element cannot be
1349                      a child of an <code>h1</code> element.</dd>
1350              </dl></dd>
1351          <dt>If the element with the error is a <code>noscript</code> element</dt>
1352              <dd>The <code>noscript</code> element is allowed only in the context
1353              where a block-level or inline-level content is expected
1354              and in the <code>head</code> element.
1355              It cannot be used in e.g. <code>ul</code>, <code>table</code>,
1356              or <code>select</code>.</dd>
1357          <dt>If the element with the error is <code>blink</code>,
1358          <code>center</code>, or <code>marquee</code> element</dt>
1359              <dd>These elements are not part of the HTML standard.
1360              Use CSS for styling control.</dd>
1361    
1362          <dt><code>button</code>, <code>datalist</code>,
1363          <code>fieldset</code>, <code>form</code>,
1364          <code>input</code>, <code>label</code>,
1365          <code>optgroup</code>, <code>option</code>, <code>output</code>,
1366          <code>rb</code>, <code>rp</code>, <code>rt</code>, <code>ruby</code>,
1367          <code>textarea</code>, or <code>textarea</code> element</dt>
1368          <!-- rbc, rtc ? -->
1369              <dd>These elements are intentionally not supported by the conformance
1370              checker <em>yet</em>.</dd>
1371        </dl>        </dl>
1372      </p>      </p>
1373    </d:desc>    </d:desc>
1374  </d:item>  </d:item>
1375    
1376  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"
1377  no DOCTYPE;parse-error;This document does not start with the <code>DOCTYPE</code> declaration.      modules="ContentChecker ContentChecker::HTML">
1378  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
1379  not closed;parse-error;Element <code>$0</code> is not closed.    outside of a <code>map</code> element.</d:message>
1380  unmatched end tag;parse-error;Element <code>$0</code> is not opened.  </d:item>
1381    
1382  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"
1383        modules="ContentChecker ContentChecker::HTML">
1384  s:IMT:obsolete subtype;should;An <em>obsolete</em> subtype is used.    <d:message xml:lang="en">There is another <code>base</code>
1385  s:IMT:private subtype;should;A private (<code>x-</code> or <code>x.</code>) subtype is used.    element.</d:message>
1386  s:IMT:unregistered subtype;should;The subtype is not registered to IANA.  </d:item>
1387    
1388    <d:item name="element not allowed:datatemplate"
1389        modules="ContentChecker ContentChecker::HTML">
1390      <d:message xml:lang="en">In a <code>datatemplate</code> element, only
1391      <code>rule</code> elements are allowed.</d:message>
1392    </d:item>
1393    
1394    <d:item name="element not allowed:details legend"
1395        modules="ContentChecker::HTML">
1396      <d:message xml:lang="en">In a <code>details</code> element, only at the
1397      beginning of the element a <code>lengend</code> element
1398      may be used.</d:message>
1399    </d:item>
1400    
1401    <d:item name="element not allowed:empty"
1402        modules="ContentChecker::HTML ContentChecker::Atom">
1403      <d:message xml:lang="en">Elements are not allowed in an empty
1404      element.</d:message>
1405    </d:item>
1406    
1407    <d:item name="element not allowed:figure legend"
1408        modules="ContentChecker::HTML">
1409      <d:message xml:lang="en">In a <code>figure</code> element, only at the
1410      beginning or only at the end of the element a <code>lengend</code> element
1411      may be used.</d:message>
1412    </d:item>
1413    
1414    <d:item name="element not allowed:flow"
1415        modules="ContentChecker::HTML">
1416      <d:message xml:lang="en">This element is not allowed where flow
1417      content is expected.</d:message>
1418    </d:item>
1419    
1420    <d:item name="element not allowed:flow style"
1421        modules="ContentChecker::HTML">
1422      <d:message xml:lang="en">A <code>style</code> element without
1423      <code>scoped</code> attribute is not allowed in this context.</d:message>
1424    </d:item>
1425    
1426    <d:item name="element not allowed:head noscript"
1427        modules="ContentChecker::HTML">
1428      <d:message xml:lang="en">This element is not allowed in a
1429      <code>noscript</code> element in the <code>head</code> element.</d:message>
1430    </d:item>
1431    
1432    <d:item name="element not allowed:head style"
1433        modules="ContentChecker::HTML">
1434      <d:message xml:lang="en">A <code>style</code> element with
1435      <code>scoped</code> attribute is not allowed in the <code>head</code>
1436      element.</d:message>
1437    </d:item>
1438    
1439    <d:item name="element not allowed:head title"
1440        modules="ContentChecker ContentChecker::HTML">
1441      <d:message xml:lang="en">There is another <code>title</code>
1442      element.</d:message>
1443    </d:item>
1444    
1445    <d:item name="element not allowed:minus"
1446        modules="ContentChecker ContentChecker::HTML">
1447      <d:message xml:lang="en">This element is not allowed in this
1448      context.</d:message>
1449    </d:item>
1450    
1451    <d:item name="element not allowed:meta charset"
1452        modules="ContentChecker::HTML">
1453      <d:message xml:lang="en">The character encoding declaration must be the
1454      first element in the <code>head</code> element.</d:message>
1455    </d:item>
1456    
1457    <d:item name="element not allowed:metadata"
1458        modules="ContentChecker::HTML">
1459      <d:message xml:lang="en">This element is not allowed where metadata
1460      content is expected.</d:message>
1461    </d:item>
1462    
1463    <d:item name="element not allowed:phrasing"
1464        modules="ContentChecker::HTML">
1465      <d:message xml:lang="en">This element is not allowed where phrasing
1466      content is expected.</d:message>
1467    </d:item>
1468    
1469    <d:item name="element not allowed:root"
1470        modules="ContentChecker">
1471      <d:message xml:lang="en">This element is not allowed as the root
1472      element of a document.</d:message>
1473      <d:desc xml:lang="en">
1474        <p>An element that is not allowed as the root element
1475        is used as the root element of the document.  The document is
1476        non-conforming, as far as the conformance checker can tell.</p>
1477    
1478        <dl class="switch">
1479        <dt><code>html</code> element in an XHTML document</dt>
1480            <dd><p>In <abbr>XHTML</abbr> document, the root <code>html</code>
1481            element must have an <code>xmlns</code> attribute as:
1482              <pre class="xml example"><code>&lt;html xmlns="http://www.w3.org/1999/xhtml"></code></pre></p></dd>
1483        <dt><code>rss</code> element</dt>
1484            <dd><p>The document is written in some version of RSS.</p>
1485            <p>The conformance checker does not support any version
1486            of RSS.  Use Atom 1.0 for feed documents.</p></dd>
1487        <dt><code>feed</code> element</dt>
1488            <dd><p>The Atom <code>feed</code> element must be
1489            in the <code>http://www.w3.org/2005/Atom</code>
1490            namespace as:
1491              <pre class="xml example"><code>&lt;feed xmlns="http://www.w3.org/2005/Atom"></code></pre>
1492            </p>
1493            <p>The conformance checker does not support Atom 0.3.
1494            Use Atom 1.0 for feed documents.</p></dd>
1495        </dl>
1496      </d:desc>
1497    </d:item>
1498    
1499    <d:item name="element not allowed:root:xml"
1500        modules="ContentChecker">
1501      <d:message xml:lang="en">This element is not allowed as the root element
1502      of an XML document.</d:message>
1503    </d:item>
1504    
1505    <d:item name="element not allowed:ruby base"
1506        modules="ContentChecker">
1507      <d:message xml:lang="en">This element is not allowed in the <code>ruby</code>
1508      element.</d:message>
1509    </d:item>
1510    
1511  s:URI::empty path;should;This IRI should explicitly end with <code>/</code>.  <d:item name="element not allowed:text"
1512  m:URI::syntax error;must;This IRI is not syntactically valid.      modules="ContentChecker::HTML">
1513      <d:message xml:lang="en">This element is not allowed in this
1514      context.</d:message>
1515    </d:item>
1516    
1517    <d:item name="element not allowed:atom|content"
1518        modules="ContentChecker::Atom">
1519      <d:message xml:lang="en">This element is not allowed in an Atom
1520      <code>content</code> element.</d:message>
1521    </d:item>
1522    
1523    <d:item name="element not allowed:atom|PersonConstruct"
1524        modules="ContentChecker::Atom">
1525      <d:message xml:lang="en">This element is not allowed in Person
1526      construct.</d:message>
1527    </d:item>
1528    
1529    <d:item name="element not allowed:atom|TextConstruct"
1530        modules="ContentChecker::Atom">
1531      <d:message xml:lang="en">This element is not allowed in Text
1532      construct.</d:message>
1533    </d:item>
1534    
1535    <d:item name="element not defined"
1536        modules="ContentChecker">
1537      <d:message xml:lang="en">This element is not defined.</d:message>
1538    </d:item>
1539    
1540    <d:item name="no significant content"
1541        modules="ContentChecker::HTML">
1542      <d:message xml:lang="en">No significant content is contained
1543      in this element.</d:message>
1544    </d:item>
1545    
1546    <d:item name="no significant content before"
1547        modules="ContentChecker::HTML">
1548      <d:message xml:lang="en">There is no significant content
1549      before this element.</d:message>
1550    </d:item>
1551    
1552    <d:item name="no significant content at the end"
1553        modules="ContentChecker::HTML">
1554      <d:message xml:lang="en">No significant content is contained
1555      at the end of this element.</d:message>
1556    </d:item>
1557    
1558    <d:item name="ps element missing"
1559        modules="ContentChecker::HTML">
1560      <d:message xml:lang="en">There is no <code><var>{text}</var></code>
1561      element before this element.</d:message>
1562      <d:desc xml:lang="en">
1563        <p>There must be an element before another element, but there
1564        is not.  The document is non-conforming.</p>
1565    
1566        <p>For example, there must be a <code>dt</code> element
1567        before any <code>dd</code> element.</p>
1568      </d:desc>
1569    </d:item>
1570    
1571    <d:item name="rp:syntax error"
1572        modules="ContentChecker::HTML">
1573      <d:message xml:lang="en">The content of a <code>rp</code> element must
1574      be a parenthesis.</d:message>
1575    </d:item>
1576    
1577    </section>
1578    
1579    <section id="attribute-errors">
1580    <h2>Attribute Errors</h2>
1581    
1582    <d:item name="attribute missing"
1583        modules="ContentChecker::HTML">
1584      <d:message xml:lang="en">Required attribute <code><var>{text}</var></code>
1585      is not specified.</d:message>
1586      <d:desc>
1587        <p>A required attribute is not specified.  The document
1588        is non-conforming.</p>
1589    
1590        <p>Some attribute is defined as <i>required</i>.
1591        Without required attributes specified, user agents
1592        cannot provide full functionality of the element to the user.</p>
1593    
1594        <dl class="switch">
1595        <dt>HTML <code>img</code> element</dt>
1596            <dd>The <code>src</code> attribute must be specified.
1597            Additionally, the <code>alt</code> attribute must be specified
1598            in many cases.</dd>
1599        <dt>HTML <code>link</code> element</dt>
1600            <dd>The <code>rel</code> attribute must be specified.
1601            Note that the <code>rev</code> attribute is obsolete.</dd>
1602        </dl>
1603      </d:desc>
1604    </d:item>
1605    
1606    <d:item name="attribute missing:data|type"
1607        modules="ContentChecker::HTML">
1608      <d:message xml:lang="en">For an <code>object</code> at least one of
1609      <code>data</code> and <code>type</code> attributes must be
1610      specified.</d:message>
1611    </d:item>
1612    
1613    <d:item name="attribute missing:href|target"
1614        modules="ContentChecker::HTML">
1615      <d:message xml:lang="en">For a <code>base</code> element, at least one of
1616      <code>href</code> and <code>target</code> attributes must be
1617      specified.</d:message>
1618    </d:item>
1619    
1620    <d:item name="attribute missing:name|http-equiv"
1621        modules="ContentChecker::HTML">
1622      <d:message xml:lang="en">For a <code>meta</code> element with the
1623      <code>content</code> attribute specified, exactly one of
1624      <code>name</code> and <code>http-equiv</code> attributes must be
1625      specified.</d:message>
1626    </d:item>
1627    
1628    <d:item name="attribute missing:name|http-equiv|charset"
1629        modules="ContentChecker::HTML">
1630      <d:message xml:lang="en">For a <code>meta</code> element, exactly one of
1631      <code>name</code>, <code>http-equiv</code>, and <code>charset</code>
1632      attributes must be specified.</d:message>
1633    </d:item>
1634    
1635    <d:item name="attribute not allowed"
1636        modules="ContentChecker::HTML RDFXML">
1637      <d:message xml:lang="en">Attribute
1638      <code><var>{local-name}</var></code> is not allowed for
1639      <code><var>{element-local-name}</var></code> element.</d:message>
1640      <d:desc xml:lang="en">
1641        <p>An attribute is specified where it is not allowed.
1642        The document is non-conforming.</p>
1643    
1644        <dl>
1645        <dt>HTML <code>meta</code> element</dt>
1646            <dd>For HTML <code>meta</code> element, <em>only one</em> of
1647            <code>name</code>, <code>http-equiv</code>, or <code>charset</code>
1648            attribute is allowed.</dd>
1649        </dl>
1650      </d:desc>
1651    </d:item>
1652    
1653    <d:item name="attribute not allowed:ismap"
1654        modules="ContentChecker::HTML">
1655      <d:message xml:lang="en">The <code>ismap</code> attribute may only be
1656      used for the image contained in an <code>a</code> element.</d:message>
1657    </d:item>
1658    
1659    <d:item name="attribute not defined"
1660        modules="ContentChecker">
1661      <d:message xml:lang="en">This attribute is not defined.</d:message>
1662    </d:item>
1663    
1664    <d:item name="in HTML:xml:lang"
1665        class="attribute-error"
1666        modules="ContentChecker::XML">
1667      <d:message xml:lang="en">The <code>xml:lang</code> attribute is not
1668      allowed in HTML document.</d:message>
1669      <d:desc xml:lang="en">
1670        <p>The <code>xml:lang</code> attribute is not allowed in
1671        HTML document.  The document is non-conforming.</p>
1672    
1673        <p>Use of the <code>xml:lang</code> attribute is conforming
1674        <em>only</em> in XML documents.</p>
1675    
1676        <p>To specify natural language information in HTML document,
1677        use <code>lang</code> attribute instead.</p>
1678    
1679        <p>XHTML 1.0 Appendix C was encouraged to specify both
1680        <code>lang</code> and <code>xml:lang</code> attributes with
1681        the same value.  Such a duplication has <em>no effect</em> in practice.
1682        Use only one of <code>lang</code> (in HTML) or <code>xml:lang</code> (in
1683        XML).</p>
1684    
1685        <!-- @@ ISSUE: xml:lang in non-HTML element in DOM5 HTML created
1686             from an HTML document? -->
1687      </d:desc>
1688    </d:item>
1689    
1690    <d:item name="in XML:charset"
1691        modules="ContentChecker::HTML">
1692      <d:message xml:lang="en">The <code>charset</code> attribute is not
1693      allowed in XML document.</d:message>
1694      <d:desc>
1695        <p>The <code>charset</code> attribute of a
1696        <code>meta</code> element is not allowed in XML document.
1697        The document is non-conforming.</p>
1698    
1699        <p>To specify the character encoding used for serialization,
1700        if necessary, use XML declaration instead:
1701          <pre class="xml example"><code>&lt;?xml version="1.0" encoding="<var>encoding-name</var>"?></code></pre>
1702        </p>
1703      </d:desc>
1704    </d:item>
1705    
1706    <d:item name="in XML:lang"
1707        modules="ContentChecker::HTML">
1708      <d:message xml:lang="en">The <code>lang</code> attribute is not
1709      allowed in XML document.</d:message>
1710      <d:desc>
1711        <p>The HTML <code>lang</code> attribute is not allowed in
1712        XML document.  The document is non-conforming.</p>
1713    
1714        <p>The <code>lang</code> attribute in <code>null</code>
1715        namespace for HTML elements is conforming <em>only</em> in
1716        HTML documents.</p>
1717    
1718        <p>To specify natural language information in XML document,
1719        use <code>xml:lang</code> attribute instead.</p>
1720      </d:desc>
1721    </d:item>
1722    
1723    <d:item name="in XML:noscript"
1724        modules="ContentChecker::HTML">
1725      <d:message xml:lang="en">A <code>noscript</code> element cannot be
1726      used in XML document.</d:message>
1727    </d:item>
1728    
1729    <d:item name="in XML:xmlns"
1730        modules="ContentChecker::HTML">
1731      <d:message xml:lang="en">The <code>xmlns</code> attribute
1732      in the <code>null</code> namespace is not allowed in
1733      XHTML document.  The document is non-conforming.</d:message>
1734      <d:desc>
1735        <p>The <code>xmlns</code> attribute in the <code>null</code>
1736        namespace is not allowed in XHTML document.</p>
1737    
1738        <p>This error should not occur in conformance-checking of
1739        static documents.</p>
1740      </d:desc>
1741    </d:item>
1742    
1743    </section>
1744    
1745    <section id="attribute-value-errors">
1746    <h2>Attribute Value Errors</h2>
1747    
1748    <d:item name="boolean:invalid"
1749        modules="ContentChecker::HTML">
1750      <d:message xml:lang="en">Attribute value <code><var>{@}</var></code>
1751      is not allowed.  It must be an empty string or a string
1752      <code><var>{local-name}</var></code>.</d:message>
1753    </d:item>
1754    
1755    <d:item name="char:syntax error"
1756        modules="ContentChecker::HTML">
1757      <d:message xml:lang="en">The attribute value must be exactly one
1758      character.</d:message>
1759    </d:item>
1760    
1761    <d:item name="charref in charset"
1762        modules="ContentChecker::HTML">
1763      <d:message xml:lang="en">A character reference cannot be used to
1764      represent a character encoding name.</d:message>
1765    </d:item>
1766    
1767    <d:item name="charset:not preferred"
1768        modules="ContentChecker::HTML">
1769      <d:message xml:lang="en">Character encoding name
1770      <code><var>{value}</var></code> is not the preferred name of that
1771      character encoding.</d:message>
1772    </d:item>
1773    
1774    <d:item name="charset:not registered"
1775        modules="ContentChecker::HTML">
1776      <d:message xml:lang="en">Character encoding name
1777      <code><var>{value}</var></code> is not a registered name.</d:message>
1778      <d:desc xml:lang="en">
1779        <p>The specified character encoding name is not registered to
1780        <abbr>IANA</abbr>.  Use of registered character encoding name
1781        is a good practice to facilitate interoperability.</p>
1782    
1783        <dl class="switch">
1784        <dt><code>EUC-TW</code></dt>
1785          <dd><code>EUC-TW</code> is not registered.  Unfortunately, there
1786          is no registered name for that character encoding.  Use
1787          Big5 encoding with character encoding name <code>Big5</code>
1788          if it is enough to represent the document.</dd>
1789        <dt><code>ISO-2022-JP-1</code></dt>
1790          <dd><code>ISO-2022-JP-1</code> is not registered, nevertheless
1791          this character encoding name is documented in
1792          <a href="urn:ietf:rfc:2237"><abbr>RFC</abbr> 2237</a>.  Use
1793          <code>ISO-2022-JP-2</code> instead, since that character encoding
1794          is a superset of ISO-2022-JP-1.</dd>
1795        <dt><code>ISO-2022-JP-3</code>, <code>ISO-2022-JP-3-plane1</code></dt>
1796          <dd>These names are not registered and obsoleted in favor of
1797          <code>ISO-2022-JP-2004</code> and
1798          <code>ISO-2022-JP-2004-plane1</code>.</dd>
1799        <dt><code>ISO-2022-JP-2003</code>,
1800        <code>ISO-2022-JP-2003-plane1</code></dt>
1801          <dd>These names are not registered and corrected to
1802          <code>ISO-2022-JP-2004</code> and
1803          <code>ISO-2022-JP-2004-plane1</code>.</dd>
1804        <dt><code>ISO-2022-JP-2004</code>,
1805        <code>ISO-2022-JP-2004-plane1</code></dt>
1806          <dd>These names are not registered.  Unfortunately, there is
1807          no registered name for these character encodings.</dd>
1808        <dt><code>UTF-8N</code></dt>
1809          <dd><code>UTF-8N</code> is not registered.  Character encoding
1810          name <code>UTF-8</code> represents UTF-8 encoding with or
1811          without <abbr>BOM</abbr>.</dd>
1812        </dl>
1813    
1814        <p><strong>WARNING</strong>: This error might be raised for
1815        a registered character encoding name, since the character encoding
1816        name database of the conformance checker is not complete yet.</p>
1817      </d:desc>
1818    </d:item>
1819    
1820    <d:item name="charset:private"
1821        modules="ContentChecker::HTML">
1822      <d:message xml:lang="en">Character encoding name
1823      <code><var>{value}</var></code> is a private name.</d:message>
1824      <d:desc xml:lang="en">
1825        <p>The specified character encoding name is a private name and
1826        not registered to <abbr>IANA</abbr>.  Use of registered character
1827        encoding name is a good practice to facilitate interoperability.</p>
1828    
1829        <dl class="switch">
1830        <dt><code>x-euc-jp</code></dt>
1831          <dd>Use <code>EUC-JP</code> for the Japanese <abbr>EUC</abbr>
1832          character encoding.</dd>
1833        <dt><code>x-sjis</code></dt>
1834          <dd>Use <code>Shift_JIS</code> for standard Shift encoding scheme of
1835          <abbr>JIS</abbr> coded character set, or <code>Windows-31J</code>
1836          for Microsoft standard character set as implemented by
1837          Microsoft Windows.</dd>
1838        </dl>
1839      </d:desc>
1840    </d:item>
1841    
1842    <d:item name="charset:syntax error"
1843        modules="ContentChecker::HTML">
1844      <d:message xml:lang="en">The specified value <code><var>{value}</var></code>
1845      is syntactically not a character encoding name.</d:message>
1846      <d:desc xml:lang="en">
1847        <p>The attribute value must be a character encoding name.  However,
1848        the specified value is not a character encoding name syntactically.
1849        The document is non‐conforming.</p>
1850        <p>Character encoding name is a string of <abbr>ASCII</abbr>
1851        printable characters, up to 40 characters.</p>
1852      </d:desc>
1853    </d:item>
1854    
1855    <d:item name="color:syntax error"
1856        modules="ContentChecker::HTML">
1857      <d:message xml:lang="en">The specified value is not a color
1858      name or hexadecimal color number.</d:message>
1859    </d:item>
1860    
1861    <d:item name="coords:number not 3"
1862        modules="ContentChecker::HTML">
1863      <d:message xml:lang="en">The <code>coords</code> attribute have to
1864      contain three (3) numbers (specified:
1865      <code><var>{text}</var></code>).</d:message>
1866    </d:item>
1867    
1868    <d:item name="coords:number not 4"
1869        modules="ContentChecker::HTML">
1870      <d:message xml:lang="en">The <code>coords</code> attribute have to
1871      contain four (4) numbers (specified:
1872      <code><var>{text}</var></code>).</d:message>
1873    </d:item>
1874    
1875    <d:item name="coords:number lt 6"
1876        modules="ContentChecker::HTML">
1877      <d:message xml:lang="en">The <code>coords</code> attribute have to
1878      contain more than or equal to six (6) numbers (specified:
1879      <code><var>{text}</var></code>).</d:message>
1880    </d:item>
1881    
1882    <d:item name="coords:number not even"
1883        modules="ContentChecker::HTML">
1884      <d:message xml:lang="en">The <code>coords</code> attribute have to
1885      contain even number of numbers (specified:
1886      <code><var>{text}</var></code>).</d:message>
1887    </d:item>
1888    
1889    <d:item name="coords:out of range"
1890        modules="ContentChecker::HTML">
1891      <d:message xml:lang="en">The specified value <code><var>{value}</var></code>
1892      is out of range.</d:message>
1893    </d:item>
1894    
1895    <d:item name="coords:syntax error"
1896        modules="ContentChecker::HTML">
1897      <d:message xml:lang="en">The specified value is not valid.</d:message>
1898    </d:item>
1899    
1900    <d:item name="datetime:bad year"
1901        modules="ContentChecker::HTML">
1902      <d:message xml:lang="en">Year number is out of range.</d:message>
1903    </d:item>
1904    
1905    <d:item name="datetime:bad month"
1906        modules="ContentChecker::HTML">
1907      <d:message xml:lang="en">Month number is out of range.</d:message>
1908    </d:item>
1909    
1910    <d:item name="datetime:bad day"
1911        modules="ContentChecker::HTML">
1912      <d:message xml:lang="en">Day number is out of range.</d:message>
1913    </d:item>
1914    
1915    <d:item name="datetime:bad hour"
1916        modules="ContentChecker::HTML">
1917      <d:message xml:lang="en">Hour number is out of range.</d:message>
1918    </d:item>
1919    
1920    <d:item name="datetime:bad minute"
1921        modules="ContentChecker::HTML">
1922      <d:message xml:lang="en">Minute number is out of range.</d:message>
1923    </d:item>
1924    
1925    <d:item name="datetime:bad second"
1926        modules="ContentChecker::HTML">
1927      <d:message xml:lang="en">Second number is out of range.</d:message>
1928    </d:item>
1929    
1930    <d:item name="datetime:bad timezone hour"
1931        modules="ContentChecker::HTML">
1932      <d:message xml:lang="en">Hour number of the timezone component is out of
1933      range.</d:message>
1934    </d:item>
1935    
1936    <d:item name="datetime:bad timezone minute"
1937        modules="ContentChecker::HTML">
1938      <d:message xml:lang="en">Minute number of the timezone component is out of
1939      range.</d:message>
1940    </d:item>
1941    
1942    <d:item name="datetime:syntax error"
1943        modules="ContentChecker::HTML">
1944      <d:message xml:lang="en">The attribute value is not a datetime.</d:message>
1945    </d:item>
1946    
1947    <d:item name="dateortime:syntax error"
1948        modules="ContentChecker::HTML">
1949      <d:message xml:lang="en">The attribute value is not a date or
1950      time.</d:message>
1951    </d:item>
1952    
1953    <d:item name="enumerated:invalid"
1954        modules="ContentChecker::HTML">
1955      <d:message xml:lang="en">This attribute only allow a limited set of
1956      values and the specified value <code><var>{@}</var></code> is not one
1957      of them.</d:message>
1958      <d:desc xml:lang="en">
1959        <p>For this attribute only several values are allowed and the
1960        value of the attribute is not one of them.  The document
1961        is non-conforming.</p>
1962    
1963        <dl>
1964        <dt>HTML <code>meta</code> element, <code>http-equiv</code> attribute</dt>
1965            <dd><p>Only values <code>Default-Style</code> and <code>Refresh</code>
1966            are allowed.</p>
1967            <p>Value <code>Content-Type</code> is obsolete; for charset
1968            declaration, the <code>charset</code> attribute can be used as:
1969            <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
1970            ... where <var>charset-name</var> is a name of the character encoding
1971            of the document, such as <code>utf-8</code>.</p>
1972            <p>Values <code>Content-Style-Type</code> and
1973            <code>Content-Script-Type</code> are currently not allowed.</p>
1974            <p>Value <code>Keywords</code> is not allowed.  Use
1975            <code>name</code> attribute instead of <code>http-equiv</code>
1976            attribute.</p>
1977            <p>Values <code>Expires</code>, <code>Pragma</code>,
1978            and <code>Cache-Control</code> are not allowed;
1979            use <em>real</em> HTTP header fields for cache control.</p></dd>
1980        </dl>
1981      </d:desc>
1982    </d:item>
1983    
1984    <d:item name="enumerated:invalid:http-equiv:content-type"
1985        class="attribute-value-error">
1986      <d:message xml:lang="en">Character encoding declaration syntax
1987      <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
1988      is obsolete.</d:message>
1989      <d:desc xml:lang="en">
1990        <p>Old long character encoding declaration syntax
1991        <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
1992        is in use.  The document is non‐conforming.</p>
1993    
1994        <p>The new character encoding declaration syntax is:
1995          <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
1996        </p>
1997      </d:desc>
1998    </d:item>
1999    
2000    <d:item name="enumerated:non-conforming"
2001        modules="ContentChecker::HTML">
2002      <d:message xml:lang="en">Attribute value <code><var>{@}</var></code>
2003      is not allowed.</d:message>
2004    </d:item>
2005    
2006    <d:item name="duplicate http-equiv"
2007        modules="ContentChecker::HTML">
2008      <d:message xml:lang="en">There is another pragma
2009      <code><var>{value}</var></code>.</d:message>
2010    </d:item>
2011    
2012    <d:item name="duplicate ID"
2013        class="attribute-value-error"
2014        modules="ContentChecker::XML ContentChecker::HTML">
2015      <d:message xml:lang="en">This identifier has already been
2016      assigned to another element.</d:message>
2017      <!-- @@ <id=a xml:id=a>? -->
2018    </d:item>
2019    
2020    <d:item name="duplicate token"
2021        modules="ContentChecker::HTML HTML::Table">
2022      <d:message xml:lang="en">The token <code><var>{value}</var></code>
2023      appears in the attribute value twice.</d:message>
2024    </d:item>
2025    
2026    <d:item name="empty attribute value"
2027        modules="ContentChecker::HTML">
2028      <d:message xml:lang="en">The attribute value must not be empty.</d:message>
2029    </d:item>
2030    
2031    <d:item name="float:out of range"
2032        modules="ContentChecker::HTML">
2033      <d:message xml:lang="en">The specified value is out of range.</d:message>
2034    </d:item>
2035    
2036    <d:item name="float:syntax error"
2037        modules="ContentChecker::HTML">
2038      <d:message xml:lang="en">The attribute value is not a real
2039      number.</d:message>
2040    </d:item>
2041    
2042    <d:item name="fragment points itself"
2043        modules="ContentChecker">
2044      <d:message xml:lang="en">A fragment identifier references the element
2045      itself.</d:message>
2046    </d:item>
2047    
2048    <d:item name="fragment points nothing"
2049        modules="ContentChecker">
2050      <d:message xml:lang="en">A fragment identifier references no
2051      node.</d:message>
2052    </d:item>
2053    
2054    <d:item name="hashref:syntax error"
2055        modules="ContentChecker::HTML">
2056      <d:message xml:lang="en">A hash−name reference must start with a
2057      <code>#</code> character.</d:message>
2058    </d:item>
2059    
2060    <d:item name="id ne name"
2061        modules="ContentChecker::HTML">
2062      <d:message xml:lang="en">The <code>id</code> attribute value is
2063      different from the <code>name</code> attribute value.</d:message>
2064    </d:item>
2065    
2066    <d:item name="integer:syntax error"
2067        modules="ContentChecker::HTML">
2068      <d:message xml:lang="en">The attribute value is not an integer.</d:message>
2069    </d:item>
2070    
2071    <d:item name="link type:bad context"
2072        modules="ContentChecker::HTML">
2073      <d:message xml:lang="en">The link type <code><var>{value}</var></code>
2074      cannot be specified for this element.</d:message>
2075      <d:desc xml:lang="en">
2076        <p>The specified link type cannot be used for the element.
2077        The document is non-conforming.</p>
2078    
2079        <p>Link types are associated with limited set of elements.
2080        They cannot be used with other elements.</p>
2081    
2082        <p>For example, link type <code>bookmark</code>
2083        can be used with <code>a</code> or <code>area</code> element,
2084        while it cannot be used with <code>link</code> element.</p>
2085      </d:desc>
2086    </d:item>
2087    
2088    <d:item name="invalid attribute value"
2089        class="attribute-value-error"
2090        modules="ContentChecker::XML ContentChecker::HTML ContentChecker::Atom">
2091      <d:message xml:lang="en">Attribute value <code><var>{@}</var></code>
2092      is not an allowed value.</d:message>
2093    </d:item>
2094    
2095    <d:item name="length:syntax error"
2096        modules="ContentChecker::HTML">
2097      <d:message xml:lang="en">The attribute value is not a length
2098      value.</d:message>
2099    </d:item>
2100    
2101    <d:item name="link type:non-conforming"
2102        modules="ContentChecker::HTML">
2103      <d:message xml:lang="en">The link type <code><var>{value}</var></code>
2104      is non-conforming.</d:message>
2105      <d:desc xml:lang="en">
2106        <p>The specified link type is non-conforming, and therefore
2107        the document is non-conforming.</p>
2108    
2109        <dl class="switch">
2110        <dt>Link type <code>contents</code></dt>
2111          <dd>Use link type <code>index</code>.</dd>
2112        <dt>Link type <code>copyright</code></dt>
2113          <dd>Use link type <code>license</code>.</dd>
2114        <dt>Link type <code>home</code></dt>
2115          <dd>Use link type <code>index</code>.</dd>
2116        <dt>Link type <code>previous</code></dt>
2117          <dd>Use link type <code>prev</code>.</dd>
2118        <dt>Link type <code>start</code></dt>
2119          <dd>Use link type <code>first</code>.</dd>
2120        <dt>Link type <code>toc</code> or <code>top</code></dt>
2121          <dd>Use link type <code>index</code>.</dd>
2122        </dl>
2123      </d:desc>
2124    </d:item>
2125    
2126    <d:item name="meta content-type syntax error"
2127        modules="ContentChecker::HTML">
2128      <d:message xml:lang="en">The specified value is not a valid as a long
2129      character encoding declaration.</d:message>
2130    </d:item>
2131    
2132    <d:item name="mismatched charset name"
2133        modules="ContentChecker::HTML">
2134      <d:message xml:lang="en">The specified character encoding name
2135      <code><var>{value}</var></code> is different from the actual document
2136      character encoding <code><var>{text}</var></code>.</d:message>
2137      <d:desc xml:lang="en">
2138        <p>The specified character encoding name is different from
2139        the character encoding of the document.  The document
2140        is non‐conforming.</p>
2141      </d:desc>
2142    </d:item>
2143    
2144    <d:item name="mismatched charset name not checked"
2145        mopdules="ContentChecker::HTML">
2146      <d:message xml:lang="en">Whether the specified character encoding name
2147      <code><var>{value}</var></code> matches to the actual character encoding
2148      name cannot be checked since the input is not a byte stream.</d:message>
2149    </d:item>
2150    
2151    <d:item name="mode:syntax error"
2152        modules="ContentChecker::HTML">
2153      <d:message xml:lang="en">The attribute value is not a valid mode
2154      name.</d:message>
2155    </d:item>
2156    
2157    <d:item name="nninteger:out of range"
2158        modules="ContentChecker::HTML">
2159      <d:message xml:lang="en">The specified value is out of range.</d:message>
2160    </d:item>
2161    
2162    <d:item name="nninteger:syntax error"
2163        modules="ContentChecker::HTML">
2164      <d:message xml:lang="en">The attribute value is not a non‐negative
2165      integer.</d:message>
2166    </d:item>
2167    
2168    <d:item name="no referenced map"
2169        modules="ContentChecker">
2170      <d:message xml:lang="en">The <code>usemap</code> attribute references
2171      no image map.</d:message>
2172    </d:item>
2173    
2174    <d:item name="no referenced menu"
2175        modules="ContentChecker">
2176      <d:message xml:lang="en">The <code>contextmenu</code> attribute references
2177      no menu.</d:message>
2178    </d:item>
2179    
2180    <d:item name="no referenced header cell"
2181        modules="ContentChecker">
2182      <d:message xml:lang="en">There is no table header cell whose <code>id</code>
2183      is <code><var>{value}</var></code> in the same table.</d:message>
2184    </d:item>
2185    
2186    <d:item name="refresh:syntax error"
2187        modules="ContentChecker::HTML">
2188      <d:message xml:lang="en">the specified value is not a valid as part
2189      of a <code>Refresh</code> pragma.</d:message>
2190    </d:item>
2191    
2192    <d:item name="repeat:syntax error"
2193        modules="ContentChecker::HTML">
2194      <d:message xml:lang="en">The attribute value is not an integer or
2195      a string <code>template</code>.</d:message>
2196    </d:item>
2197    
2198    <d:item name="reserved browsing context name"
2199        class="attribute-value-error">
2200      <d:message xml:lang="en">Browsing context name
2201      <code><var>{@}</var></code> is reserved.</d:message>
2202      <d:desc xml:lang="en">
2203        <p>The specified browsing context name is reserved.
2204        The document is non-conforming.</p>
2205    
2206        <p>Names of browsing contexts starting with <code>_</code>
2207        (<code>U+005F</code> <code class="charname">LOW LINE</code>)
2208        are reserved so that it must not be used.</p>
2209    
2210        <p>Old version of HTML, non-HTML markup languages, and
2211        Web browsers define or implements special reserved
2212        browsing context names <code>_blank</code>,
2213        <code>_main</code>, and <code>_replace</code>.
2214        However, they are <em>not</em> conforming attribute values.</p>
2215      </d:desc>
2216    </d:item>
2217    
2218    <d:item name="Reserved Prefixes and Namespace Names:Name"
2219        modules="ContentChecker::XML">
2220      <d:message xml:lang="en">Namespace name <code><var>{text}</var></code>
2221      is reserved and cannot be used for an arbitrary prefix.</d:message>
2222    </d:item>
2223    
2224    <d:item name="Reserved Prefixes and Namespace Names:Prefix"
2225        modules="ContentChecker::XML">
2226      <d:message xml:lang="en">Namespace prefix <code><var>{text}</var></code>
2227      is reserved and cannot be used for an arbitrary namespace name.</d:message>
2228    </d:item>
2229    
2230    <d:item name="link type:proposed"
2231        modules="ContentChecker::HTML">
2232      <d:message xml:lang="en">Link type <code><var>{value}</var></code>
2233      is proposed but not accepted yet; it <em>should not</em> be
2234      used until it has been accepted.</d:message>
2235      <d:desc>
2236        <p>The link type is in the <i>proposed</i> status; it
2237        <em>should not</em> be used until it has been
2238        accepted.</p>
2239    
2240        <p><strong>Warning</strong>: The data served to the
2241        conforming checker might be out of date; it might have already
2242        been accepted or rejected.  The document might or might not be
2243        conforming depending on the status.  See WHATWG Wiki
2244        for the latest information.</p>
2245      </d:desc>
2246    </d:item>
2247    
2248    <d:item name="sizes:syntax error"
2249        modules="ContentChecker::HTML">
2250      <d:message xml:lang="en">The specified value <code><var>{value}</var></code>
2251      is not a valid value.</d:message>
2252    </d:item>
2253    
2254    <d:item name="space in ID"
2255        modules="ContentChecker::HTML">
2256      <d:message xml:lang="en">White space characters are not allowed
2257      in the <code>id</code> attribute.</d:message>
2258    </d:item>
2259    
2260    <d:item name="template:not template"
2261        modules="ContentChecker ContentChecker::HTML">
2262      <d:message xml:lang="en">The node referenced by the <code>template</code>
2263      attribute is not a template.</d:message>
2264    </d:item>
2265    
2266    <d:item name="window name:empty"
2267        modules="ContentChecker::HTML">
2268      <d:message xml:lang="en">Browsing context name must not be empty.</d:message>
2269    </d:item>
2270    
2271    <d:item name="window name:reserved"
2272        modules="ContentChecker::HTML">
2273      <d:message xml:lang="en">Browsing context name
2274      <code><var>{value}</var></code> is reserved.</d:message>
2275    </d:item>
2276    
2277    <d:item name="word not allowed"
2278        modules="ContentChecker::HTML">
2279      <d:message xml:lang="en">The word <code><var>{value}</var></code> is not
2280      allowed in this attribute.</d:message>
2281    </d:item>
2282    
2283    <d:item name="XML 1.0 NCName:syntax error"
2284        modules="RDFXML">
2285      <d:message xml:lang="en">The specified value is not a legal XML Namespaces
2286      1.0 <code>NCName</code>.</d:message>
2287    </d:item>
2288    
2289    </section>
2290    
2291    <section id="table-model-errors">
2292    <h2>Table Model Errors</h2>
2293    
2294    <d:item name="cell overlapping"
2295        modules="HTML::Table">
2296      <d:message xml:lang="en">Cell slot (<var>{text}</var>) is filled by
2297      multiple cells.</d:message>
2298    </d:item>
2299    
2300    <d:item name="colspan creates column with no anchored cell"
2301        modules="HTML::Table">
2302      <d:message xml:lang="en">This <code>colspan</code> attribute
2303      results in creating a table column that does not contain
2304      any cell anchored to it.</d:message>
2305    </d:item>
2306    
2307    <d:item name="column with no anchored cell"
2308        modules="HTML::Table">
2309      <d:message xml:lang="en">This column has no anchored cell.</d:message>
2310    </d:item>
2311    
2312    <d:item name="table:no cell in last row"
2313        class="table-model-error">
2314      <d:message xml:lang="en">The table has no cell (<code>td</code> or
2315      <code>th</code>) in the last row.</d:message>
2316    </d:item>
2317    
2318    <d:item name="table:rowspan extends table"
2319        class="table-model-error">
2320      <d:message xml:lang="en">This <code>rowspan</code> attribute
2321      results in creating a table row that does not contain
2322      any cell anchored to it.</d:message>
2323      <d:desc xml:lang="en">
2324        <p>The <code>rowspan</code> attribute value of the cell
2325        is so specified that it extends a table in the row axis.
2326        However, the extended row does not contain any cell by itself.
2327        The document is non-conforming.</p>
2328    
2329        <p>For example, the table below is non-conforming:
2330          <pre class="html bad example"><code>&lt;table>
2331    &lt;tbody>
2332    &lt;tr>&lt;td rowspan=2>&lt;/td>&lt;/tr>
2333    &lt;/tbody>
2334    &lt;/table></code></pre>
2335        ... since the second row contains only
2336        a cell that spans between first and second rows.</p>
2337      </d:desc>
2338    </d:item>
2339    
2340    <d:item name="row with no anchored cell"
2341        modules="HTML::Table">
2342      <d:message xml:lang="en">This row has no anchored cell.</d:message>
2343    </d:item>
2344    
2345    <d:item name="rowspan creates row with no anchored cell"
2346        modules="HTML::Table">
2347      <d:message xml:lang="en">This <code>rowspan</code> attribute
2348      results in creating a table row that does not contain
2349      any cell anchored to it.</d:message>
2350    </d:item>
2351    
2352    
2353    </section>
2354    
2355    <section id="imt-warnings">
2356    <h2>Internet Media Type Errors</h2>
2357    
2358    <d:item name="IMT:composite"
2359        modules="ContentChecker::Atom">
2360      <d:message xml:lang="en">The specified media type is a composite
2361      type, which is not allowed in this context.</d:message>
2362    </d:item>
2363    
2364    <d:item name="IMT:syntax error"
2365        modules="ContentChecker::HTML ContentChecker::Atom">
2366      <d:message xml:lang="en">The specified value is not an Internet Media
2367      Type.</d:message>
2368    </d:item>
2369    
2370    <d:item name="IMT:obsolete subtype"
2371        class="should" level="s">
2372      <d:message xml:lang="en"><code><var>{@}</var></code>: An <em>obsolete</em>
2373      subtype is used.</d:message>
2374      <d:item xml:lang="en">
2375        <p>The specified Internet Media Type is registered with status
2376        of <i>OBSOLETE</i>.</p><!-- @@ SHOULD NOT? -->
2377        
2378        <dl class="swtich">
2379        <dt>Media type <code>text/ecmascript</code></dt>
2380          <dd>Media type <code>text/ecmascript</code> is obsoleted in
2381          favor of <code>application/ecmascript</code>.  Note that
2382          <code>text/javascript</code> would be better alternative
2383          for many cases.</dd>
2384        <dt>Media type <code>text/javascript</code></dt>
2385          <dd>Media type <code>text/javascript</code> is obsoleted by
2386          <abbr>IETF</abbr> with backward incompatible alternate
2387          <code>application/javascript</code> for architectural
2388          purity.<!-- @@ ref? -->  Realist may ignore this warning.</dd>
2389        </dl>
2390      </d:item>
2391    </d:item>
2392    
2393    <d:item name="IMT:private subtype"
2394        class="should" level="s">
2395      <d:message xml:lang="en"><code><var>{@}</var></code>: A private
2396      (<code>x-</code> or <code>x.</code>) subtype is used.</d:message>
2397    </d:item>
2398    
2399    <d:item name="IMT:unregistered subtype"
2400        class="should" level="s">
2401      <d:message xml:lang="en"><code><var>{@}</var></code>: The subtype is
2402      not registered to IANA.</d:message>
2403    <!-- TODO: Unknown message?? -->
2404    </d:item>
2405    
2406    <d:item name="not IMT"
2407        modules="ContentChecker::Atom">
2408      <d:message xml:lang="en">A value that is not an Internet Media Type
2409      is not allowed here.</d:message>
2410    </d:item>
2411    
2412    </section>
2413    
2414    <section id="uri-errors">
2415    <h2>URI (or IRI) Errors</h2>
2416    
2417    <d:item name="URI::syntax error"
2418        class="must" level="m">
2419      <d:message xml:lang="en">The specified value is syntactically not an IRI
2420      reference.</d:message>
2421      <d:desc xml:lang="en">
2422        <p>The specified value does not satisfy the syntactical requirements
2423        for IRI references.  The document is non-conforming.</p>
2424    
2425        <p>Possible causes:
2426          <ul>
2427          <li>The string might contain one or more white space characters.
2428          Especially, the <code> </code> (<code>U+0020</code>
2429          <code class="charname">SPACE</code>) character cannot be
2430          used in IRI references.</li>
2431          </ul>
2432        </p>
2433      </d:desc>
2434    </d:item>
2435    
2436    </section>
2437    
2438    <section id="uri-shoulds">
2439    <h2>URI (or IRI) Should-level Errors</h2>
2440    
2441    <d:item name="URI::dot-segment"
2442        class="should" level="s">
2443      <d:message xml:lang="en">A dot-segment (<code>.</code> or
2444      <code>..</code>) occurs in an absolute reference.</d:message>
2445      <d:desc>
2446        <p>Dot-segment (<code>.</code> or <code>..</code>) should
2447        not occur in an absolute reference.</p>
2448    
2449        <p>In relative references, dot-segments are used to represent
2450        the current (<code>.</code>) or the parent (<code>..</code>)
2451        hierarchy of the path.  Though they are also allowed
2452        in absolute references, it should be resolved to the
2453        canonical form before it has been published.</p>
2454      </d:desc>
2455    </d:item>
2456    
2457    <d:item name="URI::empty path"
2458        class="should" level="s">
2459      <d:message xml:lang="en">This IRI does not end with
2460      a <code>/</code>.</d:message>
2461      <d:item xml:lang="en">
2462        <p>The IRI does not end with a <code>/</code>.  If there is an
2463        authority component in an IRI, a <code>/</code> should be present
2464        instead of empty path component.</p>
2465    
2466        <p>For example, <code>http://www.example.com<strong>/</strong></code>
2467        is preferred to <code>http://www.example.com</code>.</p>
2468      </d:item>
2469    </d:item>
2470    
2471    <d:item name="URI::lowercase hexadecimal digit"
2472        class="should" level="s">
2473      <d:message xml:lang="en">A lowercase hexadecimal digit is used
2474      in percent-encoding.</d:message>
2475      <d:desc xml:lang="en">
2476        <p>The hexadecimal digit in percent-encoding string in the IRI
2477        is in lowercase.  Though the IRI <em>is</em> conforming,
2478        it should be in uppercase.</p>
2479      </d:desc>
2480    </d:item>
2481    
2482    <d:item name="URI::percent-encoded unreserved"
2483        class="should" level="s">
2484      <d:message xml:lang="en">An unreserved character is
2485      percent-encoded.</d:message>
2486      <d:desc xml:lang="en">
2487        <p>An unreserved character is percent-encoded in the IRI.
2488        Though it <em>is</em> conforming, it should be in the
2489        decoded (or bare) form.</p>
2490      </d:desc>
2491    </d:item>
2492    
2493    <d:item name="URI::uppercase scheme name"
2494        class="should" level="s">
2495      <d:message xml:lang="en">URI scheme name is in uppercase.</d:message>
2496      <d:desc xml:lang="en">
2497        <p>The scheme part of the IRI is written in uppercase letter.</p>
2498    
2499        <p>Uppercase scheme names are not required to be processed
2500        correctly.</p>
2501    <!-- @@
2502     RFC 3986 3.1.
2503     > Although schemes are case-
2504       insensitive, the canonical form is lowercase and documents that
2505       specify schemes must do so with lowercase letters.
2506    
2507     > An implementation ... should only produce lowercase scheme names for
2508       consistency.
2509    -->
2510      </d:desc>
2511    </d:item>
2512    
2513    </section>
2514    
2515    <section id="cache-manifest-errors">
2516    <h2>Cache Manifest Errors</h2>
2517    
2518    <d:item name="not manifest" class="must" level="m">
2519      <d:message xml:lang="en">This document is not a cache manifest.</d:message>
2520      <d:desc xml:lang="en">
2521        <p>The specified document is <em>not</em> a cache manifest.
2522        The document is non-conforming.</p>
2523    
2524        <p>An entity labeled as Internet media type
2525        <code>text/cache-manifest</code> must contain a cache manifest.</p>
2526    
2527        <p>A cache manifest must start with a line whose content is
2528        <code class="manifest example">CACHE MANIFEST</code>
2529        (exactly one space character between
2530        <code>CACHE</code> and <code>MANIFEST</code>).</p>
2531      </d:desc>
2532    </d:item>
2533    </section>
2534    
2535    <section id="information">
2536    <h2>Stability Information</h2>
2537    
2538    <d:item name="deprecated:attr"
2539        modules="ContentChecker">
2540      <d:message xml:lang="en">This attribute is deprecated.</d:message>
2541    </d:item>
2542    
2543    <d:item name="deprecated:element"
2544        modules="ContentChecker">
2545      <d:message xml:lang="en">This element is deprecated.</d:message>
2546    </d:item>
2547    
2548    <d:item name="status:cr:element"
2549        modules="ContentChecker">
2550      <d:message xml:lang="en">This element is in the
2551      <strong>call for implementation</strong> stage.</d:message>
2552      <d:desc xml:lang="en">
2553        <p>The element is in the call for implementation stage.</p>
2554        
2555        <p>Usually, using the element is safe.  However, it is a new feature
2556        so that it might not be implemented correctly.  If it is found that
2557        the feature is hard or impossible to implement, the feature
2558        might be revised, or in some case it might be dropped.</p>
2559    
2560        <p>Elements defined by Atom 1.0 (IETF Proposed Standard), and XBL 2.0
2561        (W3C Candidate Recommendation) belong to this class.</p>
2562      </d:desc>
2563    </d:item>
2564    
2565    <d:item name="status:lc:element"
2566        modules="ContentChecker">
2567      <d:message xml:lang="en">This element is in the <strong>last
2568      call for comments</strong> stage.</d:message>
2569      <d:desc xml:lang="en">
2570        <p>The element is in the last call for comments stage.</p>
2571        
2572        <p>The element is relatively mature, though the standardization
2573        is not done yet.  It may be used for experiments.  Since it is a new
2574        feature, it might not be implemented correctly or at all.  If it is
2575        found that the feature is hard or impossible to implement, the feature
2576        might be revised or might be dropped.</p>
2577    
2578        <p>Elements defined by Web Forms 2.0 as well as some elements
2579        defined by HTML5 belong to this class.</p>
2580      </d:desc>
2581    </d:item>
2582    
2583    <d:item name="status:wd:element"
2584        modules="ContentChecker">
2585      <d:message xml:lang="en">This element is documented in a <strong>working
2586      draft</strong>.</d:message>
2587      <d:desc xml:lang="en">
2588        <p>The element is documented in a working or editor's draft
2589        and not yet completed.</p>
2590        
2591        <p>The element should not be used for any practical purpose.
2592        The feature might be drastically changed later or might be
2593        entirely removed.</p>
2594    
2595        <p>Most of new elements defined by HTML5 belong to this class.</p>
2596      </d:desc>
2597    </d:item>
2598    
2599    <d:item name="status:non-standard:element"
2600        modules="ContentChecker">
2601      <d:message xml:lang="en">This element is <strong>not part of any
2602      standard</strong> the conformance checker knows.</d:message>
2603      <d:desc xml:lang="en">
2604        <p>The element is not part of any standard or draft the conformance
2605        checker is aware of.</p>
2606        
2607        <p>The element should not be used for any practical purpose unless
2608        there is really a standard that defines the element.</p>
2609      </d:desc>
2610    </d:item>
2611    
2612    <d:item name="status:cr:attr"
2613        modules="ContentChecker">
2614      <d:message xml:lang="en">This attribute is in the
2615      <strong>call for implementation</strong> stage.</d:message>
2616      <d:desc xml:lang="en">
2617        <p>The attribute is in the call for implementation stage.</p>
2618        
2619        <p>Usually, using the attribute is safe.  However, it is a new feature
2620        so that it might not be implemented correctly.  If it is found that
2621        the feature is hard or impossible to implement, the feature
2622        might be revised, or in some case it might be dropped.</p>
2623      </d:desc>
2624    </d:item>
2625    
2626    <d:item name="status:lc:attr"
2627        modules="ContentChecker">
2628      <d:message xml:lang="en">This attribute is in the <strong>last
2629      call for comments</strong> stage.</d:message>
2630      <d:desc xml:lang="en">
2631        <p>The attribute is in the last call for comments stage.</p>
2632        
2633        <p>The attribute is relatively mature, though the standardization
2634        is not done yet.  It may be used for experiments.  Since it is a new
2635        feature, it might not be implemented correctly or at all.  If it is
2636        found that the feature is hard or impossible to implement, the feature
2637        might be revised or might be dropped.</p>
2638      </d:desc>
2639    </d:item>
2640    
2641    <d:item name="status:wd:attr"
2642        modules="ContentChecker">
2643      <d:message xml:lang="en">This attribute is documented in a <strong>working
2644      draft</strong>.</d:message>
2645      <d:desc xml:lang="en">
2646        <p>The attribute is documented in a working or editor's draft
2647        and not yet completed.</p>
2648        
2649        <p>The attribute should not be used for any practical purpose.
2650        The feature might be drastically changed later or might be
2651        entirely removed.</p>
2652      </d:desc>
2653    </d:item>
2654    
2655    <d:item name="status:non-standard:attr"
2656        modules="ContentChecker">
2657      <d:message xml:lang="en">This attribute is <strong>not part of any
2658      standard</strong> the conformance checker knows.</d:message>
2659      <d:desc xml:lang="en">
2660        <p>The attribute is not part of any standard or draft the conformance
2661        checker is aware of.</p>
2662        
2663        <p>The attribute should not be used for any practical purpose unless
2664        there is really a standard that defines the attribute.</p>
2665      </d:desc>
2666    </d:item>
2667    </section>
2668    
2669    <section id="rdfxml-errors">
2670    <h2>RDF/XML Errors</h2>
2671    
2672    <d:item name="bad rdf namespace"
2673        modules="RDFXML">
2674      <d:message xml:lang="en">The namespace URI of an element that
2675      represents an RDF concept must be
2676      <code>http://www.w3.org/1999/02/22-rdf-syntax-ns#</code>.</d:message>
2677    </d:item>
2678    
2679    <d:item name="duplicate rdf id"
2680        modules="RDFXML">
2681      <d:message xml:lang="en">The specified value is already used as an
2682      ID.</d:message>
2683    </d:item>
2684    
2685    <d:item name="duplicate unqualified attr"
2686        modules="RDFXML">
2687      <d:message xml:lang="en">Both unqualified attribute and namespace‐qualified
2688      RDF attribute are specified, which is not allowed.</d:message>
2689    </d:item>
2690    
2691    <d:item name="parse type other"
2692        modules="RDFXML">
2693      <d:message xml:lang="en">An invalid value is specified to
2694      the <code>parseType</code> attribute.</d:message>
2695    </d:item>
2696    
2697    <d:item name="second node element"
2698        modules="RDFXML">
2699      <d:message xml:lang="en">There is another element, such that
2700      this element is not allowed.</d:message>
2701    </d:item>
2702    
2703    <d:item name="unqualified attr"
2704        modules="RDFXML">
2705      <d:message xml:lang="en">Unqualified attribute is not allowed.</d:message>
2706    </d:item>
2707    
2708    <d:item name="unqualified rdf attr"
2709        modules="RDFXML">
2710      <d:message xml:lang="en">RDF attribute should be
2711      namespace‐qualified.</d:message>
2712    </d:item>
2713    
2714  </section>  </section>
2715    
2716  <section id="unsupported-messages">  <section id="unsupported-messages">
2717  <h2><i>Unsupported</i> Messages</h2>  <h2><i>Unsupported</i> Messages</h2>
2718    
2719  <d:item name="unsupported:attribute"  <d:item name="unknown element"
2720      class="unsupported">      modules="ContentChecker">
2721    <d:message xml:lang="en">This attribute is not supported by the    <d:message xml:lang="en">Conformance checking for element
2722    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
2723      might not be conforming</em>.</d:message>
2724    <d:desc xml:lang="en">    <d:desc xml:lang="en">
2725      <p>The conformant checker does not support the attribute.      <p>The conformant checker does not support the element.
2726      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
2727    </d:desc>    </d:desc>
2728  </d:item>  </d:item>
2729    
2730  <d:item name="unsupported:element"  <d:item name="unknown attribute"
2731      class="unsupported">      modules="ContentChecker ContentChecker::HTML ContentChecker::Atom">
2732    <d:message xml:lang="en">This element is not supported by the    <d:message xml:lang="en">Conformance checking for attribute
2733    conformance checker; <em>it might or might not be conforming</em>.</d:message>    <code><var>{local-name}</var></code> of element
2734      <code><var>{element-local-name}</var></code> is not supported;
2735      <em>it might or might not be conforming</em>.</d:message>
2736    <d:desc xml:lang="en">    <d:desc xml:lang="en">
2737      <p>The conformant checker does not support the element.      <p>The conformant checker does not support the attribute.
2738      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
2739    </d:desc>    </d:desc>
2740  </d:item>  </d:item>
2741    
2742  <d:item name="unsupported:link type"  <d:item name="unknown link type"
2743      class="unsupported">      modules="ContentChecker::HTML">
2744    <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
2745    or registered at the time of the release of the conformance checker;    standardized or registered at the time of the release of the conformance
2746    <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
2747      registered</em>.</d:message>
2748    <d:desc xml:lang="en">    <d:desc xml:lang="en">
2749      <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.
2750      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 2756  m:URI::syntax error;must;This IRI is not
2756      The link type might have been added to the registry since then.      The link type might have been added to the registry since then.
2757      In such case it might be conforming.  Otherwise, the      In such case it might be conforming.  Otherwise, the
2758      document is non-conforming.</p>      document is non-conforming.</p>
2759    
2760        <dl>
2761        <dt>Link types <code>shortcut icon</code></dt>
2762            <dd>Link type <code>shortcut</code> is not registered.
2763            Use only <code>icon</code> for linking to so-called favicon.</dd>
2764        </dl>
2765    </d:desc>    </d:desc>
2766  </d:item>  </d:item>
2767    
2768    <d:item name="event handler"
2769        modules="ContentChecker::HTML">
2770      <d:message xml:lang="en">Conformance checking for event handler attribute
2771      is not supported; <em>it might or might not be conforming.</em></d:message>
2772    </d:item>
2773    
2774    <d:item name="media query"
2775        modules="ContentChecker::HTML">
2776      <d:message xml:lang="en">Conformance checking for media query
2777      is not supported; <em>it might or might not be conforming.</em></d:message>
2778    </d:item>
2779    
2780    <d:item name="addr-spec not supported"
2781        modules="ContentChecker::Atom">
2782      <d:message xml:lang="en">Conformance checking for an <code>addr-spec</code>
2783      is not supported; <em>it might or might not be conforming.</em></d:message>
2784    </d:item>
2785    
2786    <d:item name="XML script lang"
2787        modules="ContentChecker::HTML">
2788      <d:message xml:lang="en">Conformance checking for script
2789      language <code><var>{text}</var></code> is not supported;
2790      <em>it might or might not be conforming.</em></d:message>
2791    </d:item>
2792    
2793    <d:item name="XML style lang"
2794        modules="ContentChecker::HTML">
2795      <d:message xml:lang="en">Conformance checking for style
2796      language <code><var>{text}</var></code> is not supported;
2797      <em>it might or might not be conforming.</em></d:message>
2798    </d:item>
2799    
2800    <d:item name="atom|content not supported"
2801        modules="ContentChecker::Atom">
2802      <d:message xml:lang="en">Conformance checking for an Atom
2803      <code>content</code> element with <code>type</code>
2804      <code><var>{text}</var></code> is not supported.</d:message>
2805    </d:item>
2806    
2807    </section>
2808    
2809    <d:cat name="WebHACC:Title">
2810      <d:text xml:lang="en">WebHACC (β)</d:text>
2811    </d:cat>
2812    
2813    <d:cat name="WebHACC:Heading">
2814      <d:text xml:lang="en">
2815        <a href="../cc-about"><abbr title="Web Hypertext Application Conformance Checker (β)"><img src="../icons/title" alt="WebHACC"/></abbr></a>
2816      </d:text>
2817      <d:text xml:lang="ja">
2818        <a href="../cc-about"><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>
2819      </d:text>
2820    </d:cat>
2821    
2822    <d:cat name="Input">
2823      <d:text xml:lang="en">Input</d:text>
2824      <d:text xml:lang="ja">入力</d:text>
2825    </d:cat>
2826    
2827    <d:cat name="By URL">
2828      <d:text xml:lang="en">By URL</d:text>
2829      <d:text xml:lang="ja">URL で指定</d:text>
2830    </d:cat>
2831    
2832    <d:cat name="By direct input">
2833      <d:text xml:lang="en">By direct input</d:text>
2834      <d:text xml:lang="ja">直接入力</d:text>
2835    </d:cat>
2836    
2837    <d:cat name="Options">
2838      <d:text xml:lang="en">More options</d:text>
2839      <d:text xml:lang="ja">検査オプション</d:text>
2840    </d:cat>
2841    
2842    <d:cat name="Check error page">
2843      <d:text xml:lang="en">Check an error page</d:text>
2844      <d:text xml:lang="ja">誤り頁を検査する</d:text>
2845    </d:cat>
2846    
2847    <d:cat name="Content type">
2848      <d:text xml:lang="en">Content type</d:text>
2849      <d:text xml:lang="ja">内容型</d:text>
2850    </d:cat>
2851    
2852    <d:cat name="Charset">
2853      <d:text xml:lang="en">Character encoding</d:text>
2854      <d:text xml:lang="ja">文字符号化</d:text>
2855    </d:cat>
2856    
2857    <d:cat name="As specified">
2858      <d:text xml:lang="en">As specified</d:text>
2859      <d:text xml:lang="ja">指定通り</d:text>
2860    </d:cat>
2861    
2862    <d:cat name="Japanese charsets">
2863      <d:text xml:lang="en">Japanese character encodings</d:text>
2864      <d:text xml:lang="ja">日本語用文字符号化</d:text>
2865    </d:cat>
2866    
2867    <d:cat name="European charsets">
2868      <d:text xml:lang="en">European character encodings</d:text>
2869      <d:text xml:lang="ja">欧米言語用文字符号化</d:text>
2870    </d:cat>
2871    
2872    <d:cat name="Asian charsets">
2873      <d:text xml:lang="en">Asian character encodings</d:text>
2874      <d:text xml:lang="ja">アジア諸語用文字符号化</d:text>
2875    </d:cat>
2876    
2877    <d:cat name="Unicode charsets">
2878      <d:text xml:lang="en">Unicode character encodings</d:text>
2879      <d:text xml:lang="ja">Unicode 系文字符号化</d:text>
2880    </d:cat>
2881    
2882    <d:cat name="Document source to check">
2883      <d:text xml:lang="en">Document source to check</d:text>
2884      <d:text xml:lang="ja">検査する文書のソース</d:text>
2885    </d:cat>
2886    
2887    <d:cat name="Check">
2888      <d:text xml:lang="en">Check</d:text>
2889      <d:text xml:lang="ja">検査</d:text>
2890    </d:cat>
2891    
2892    <d:cat name="Setting innerHTML">
2893      <d:text xml:lang="en">Setting <code>innerHTML</code> of HTML element</d:text>
2894      <d:text xml:lang="ja"><code>innerHTML</code> に値を設定する HTML 要素</d:text>
2895    </d:cat>
2896    
2897    <d:cat name="Information">
2898      <d:text xml:lang="en">Information</d:text>
2899      <d:text xml:lang="ja">情報</d:text>
2900    </d:cat>
2901    
2902    <d:cat name="HTTP Header">
2903      <d:text xml:lang="en"><abbr title="Hypertext Transfer Protocol">HTTP</abbr>
2904          Header</d:text>
2905      <d:text xml:lang="ja"><abbr lang="en" title="Hypertext Transfer Protocol">HTTP</abbr>
2906          頭部</d:text>
2907    </d:cat>
2908    
2909    <d:cat name="Parse Errors Section">
2910      <d:text xml:lang="en">Parse Errors</d:text>
2911      <d:text xml:lang="ja">構文誤り</d:text>
2912    </d:cat>
2913    
2914    <d:cat name="Parse Errors">
2915      <d:text xml:lang="en">Parse Errors</d:text>
2916      <d:text xml:lang="ja">構文誤り</d:text>
2917    </d:cat>
2918    
2919    <d:cat name="Document Source">
2920      <d:text xml:lang="en">Document Source</d:text>
2921      <d:text xml:lang="ja">文書のソース</d:text>
2922    </d:cat>
2923    
2924    <d:cat name="Source">
2925      <d:text xml:lang="en">Source</d:text>
2926      <d:text xml:lang="ja">ソース</d:text>
2927    </d:cat>
2928    
2929    <d:cat name="Tables Section">
2930      <d:text xml:lang="en">Structure of Tables</d:text>
2931      <d:text xml:lang="ja">表の構造</d:text>
2932    </d:cat>
2933    
2934    <d:cat name="Tables">
2935      <d:text xml:lang="en">Tables</d:text>
2936      <d:text xml:lang="ja">表</d:text>
2937    </d:cat>
2938    
2939    <d:cat name="Document Tree">
2940      <d:text xml:lang="en">Document Tree</d:text>
2941      <d:text xml:lang="ja">文書木</d:text>
2942    </d:cat>
2943    
2944    <d:cat name="Tree">
2945      <d:text xml:lang="en">Tree</d:text>
2946      <d:text xml:lang="ja">木</d:text>
2947    </d:cat>
2948    
2949    <d:cat name="Document">
2950      <d:text xml:lang="en">Document</d:text>
2951      <d:text xml:lang="ja">文書</d:text>
2952    </d:cat>
2953    
2954    <d:cat name="Document Structure">
2955      <d:text xml:lang="en">Document Structure</d:text>
2956      <d:text xml:lang="ja">文書構造</d:text>
2957    </d:cat>
2958    
2959    <d:cat name="Structure">
2960      <d:text xml:lang="en">Structure</d:text>
2961      <d:text xml:lang="ja">構造</d:text>
2962    </d:cat>
2963    
2964    <d:cat name="Reformatted Document Source">
2965      <d:text xml:lang="en">Reformatted Document Source</d:text>
2966      <d:text xml:lang="ja">再整形した文書のソース</d:text>
2967    </d:cat>
2968    
2969    <d:cat name="Reformatted">
2970      <d:text xml:lang="en">Reformatted</d:text>
2971      <d:text xml:lang="ja">再整形</d:text>
2972    </d:cat>
2973    
2974    <d:cat name="RDF Triples">
2975      <d:text xml:lang="en"><abbr>RDF</abbr> Triples</d:text>
2976      <d:text xml:lang="ja"><abbr lang="en">RDF</abbr> 三項組</d:text>
2977    </d:cat>
2978    
2979    <d:cat name="RDF">
2980      <d:text xml:lang="en"><abbr>RDF</abbr></d:text>
2981      <d:text xml:lang="ja"><abbr lang="en">RDF</abbr></d:text>
2982    </d:cat>
2983    
2984    <d:cat name="Structural Errors">
2985      <d:text xml:lang="en">Structural Errors</d:text>
2986      <d:text xml:lang="ja">構造的誤り</d:text>
2987    </d:cat>
2988    
2989    <d:cat name="Struct. Errors">
2990      <d:text xml:lang="en">Struct. Errors</d:text>
2991      <d:text xml:lang="ja">構造誤り</d:text>
2992    </d:cat>
2993    
2994    <d:cat name="Transfer Errors">
2995      <d:text xml:lang="en">Transfer Errors</d:text>
2996      <d:text xml:lang="ja">転送誤り</d:text>
2997    </d:cat>
2998    
2999    <d:cat name="Trans. Errors">
3000      <d:text xml:lang="en">Trans. Errors</d:text>
3001      <d:text xml:lang="ja">転送誤り</d:text>
3002    </d:cat>
3003    
3004    <d:cat name="Result">
3005      <d:text xml:lang="en">Result</d:text>
3006      <d:text xml:lang="ja">結果</d:text>
3007    </d:cat>
3008    
3009    <d:cat name="manakaiCompatMode:quirks">
3010      <d:text xml:lang="en">Quirks Mode</d:text>
3011      <d:text xml:lang="ja">奇癖モード</d:text>
3012    </d:cat>
3013    
3014    <d:cat name="manakaiCompatMode:limited quirks">
3015      <d:text xml:lang="en">Limited Quirks Mode</d:text>
3016      <d:text xml:lang="ja">限定奇癖モード</d:text>
3017    </d:cat>
3018    
3019    <d:cat name="manakaiCompatMode:no quirks">
3020      <d:text xml:lang="en">No Quirks Mode</d:text>
3021      <d:text xml:lang="ja">無奇癖モード</d:text>
3022    </d:cat>
3023    
3024    <d:cat name="manakaiIsHTML:1">
3025      <d:text xml:lang="en">HTML Document</d:text>
3026      <d:text xml:lang="ja">HTML 文書</d:text>
3027    </d:cat>
3028    
3029    <d:cat name="manakaiIsHTML:0">
3030      <d:text xml:lang="en">XML Document</d:text>
3031      <d:text xml:lang="ja">XML 文書</d:text>
3032    </d:cat>
3033    
3034    <d:cat name="manakaiCharset">
3035      <d:text xml:lang="en"><code>charset</code> parameter</d:text>
3036      <d:text xml:lang="ja"><code lang="en">charset</code> 引数</d:text>
3037    </d:cat>
3038    
3039    <d:cat name="inputEncoding">
3040      <d:text xml:lang="en">Input character encoding</d:text>
3041      <d:text xml:lang="ja">入力に用いた文字符号化</d:text>
3042    </d:cat>
3043    
3044    <d:cat name="xmlVersion">
3045      <d:text xml:lang="en">XML <code>version</code></d:text>
3046      <d:text xml:lang="ja">XML <code lang="en">version</code></d:text>
3047    </d:cat>
3048    
3049    <d:cat name="xmlEncoding">
3050      <d:text xml:lang="en">XML <code>encoding</code></d:text>
3051      <d:text xml:lang="ja">XML <code lang="en">encoding</code></d:text>
3052    </d:cat>
3053    
3054    <d:cat name="xmlStandalone">
3055      <d:text xml:lang="en">XML <code>standalone</code></d:text>
3056      <d:text xml:lang="ja">XML <code lang="en">standalone</code></d:text>
3057    </d:cat>
3058    
3059    <d:cat name="... with BOM">
3060      <d:text xml:lang="en"> (with <code class="charname"><abbr title="BYTE ORDER MARK">BOM</abbr></code>)</d:text>
3061      <d:text xml:lang="ja"> (<code class="charname" lang="en"><abbr title="BYTE ORDER MARK">BOM</abbr></code> つき)</d:text>
3062    </d:cat>
3063    
3064    <d:cat name="URL">
3065      <d:text xml:lang="en"><abbr title="Uniform Resource Locator">URL</abbr></d:text>
3066      <d:text xml:lang="ja"><abbr title="統一資源所在子">URL</abbr></d:text>
3067    </d:cat>
3068    
3069    <d:cat name="URLs">
3070      <d:text xml:lang="en"><abbr title="Uniform Resource Locators">URLs</abbr></d:text>
3071      <d:text xml:lang="ja"><abbr title="統一資源所在子">URL</abbr></d:text>
3072    </d:cat>
3073    
3074    <d:cat name="Container Node">
3075      <d:text xml:lang="en">Container Node</d:text>
3076      <d:text xml:lang="ja">この文書を含む節点</d:text>
3077    </d:cat>
3078    
3079    <d:cat name="Table Element">
3080      <d:text xml:lang="en">Table Element</d:text>
3081      <d:text xml:lang="ja">表要素</d:text>
3082    </d:cat>
3083    
3084    <d:cat name="Base URL">
3085      <d:text xml:lang="en">Base URL</d:text>
3086      <d:text xml:lang="ja">基底 URL</d:text>
3087    </d:cat>
3088    
3089    <d:cat name="Internet Media Type">
3090      <d:text xml:lang="en">Internet Media Type</d:text>
3091      <d:text xml:lang="ja">インターネット媒体型</d:text>
3092    </d:cat>
3093    
3094    <d:cat name="Character Encoding">
3095      <d:text xml:lang="en">Character Encoding</d:text>
3096      <d:text xml:lang="ja">文字符号化</d:text>
3097    </d:cat>
3098    
3099    <d:cat name="Byte Length">
3100      <d:text xml:lang="en">Byte Length</d:text>
3101      <d:text xml:lang="ja">バイト長</d:text>
3102    </d:cat>
3103    
3104    <d:cat name="Character Length">
3105      <d:text xml:lang="en">Character Length</d:text>
3106      <d:text xml:lang="ja">文字長</d:text>
3107    </d:cat>
3108    
3109    <d:cat name="... overridden">
3110      <d:text xml:lang="en"> (<i>overridden</i>)</d:text>
3111      <d:text xml:lang="ja"> (<i>上書き</i>)</d:text>
3112    </d:cat>
3113    
3114    <d:cat name="... overridden, official type is #">
3115      <d:text xml:lang="en"> (<i>overridden</i>; official type is
3116          <code lang="en" class="MIME"><var>{text}</var></code>)</d:text>
3117      <d:text xml:lang="ja"> (<i>上書き</i>, 公式型は
3118          <code lang="en" class="MIME"><var>{text}</var></code>)</d:text>
3119    </d:cat>
3120    
3121    <d:cat name="... sniffed">
3122      <d:text xml:lang="en"> (<i>sniffed</i>)</d:text>
3123      <d:text xml:lang="ja"> (<i>探知結果</i>)</d:text>
3124    </d:cat>
3125    
3126    <d:cat name="byte">
3127      <d:text xml:lang="en">byte</d:text>
3128      <d:text xml:lang="ja">バイト</d:text>
3129    </d:cat>
3130    
3131    <d:cat name="bytes">
3132      <d:text xml:lang="en">bytes</d:text>
3133      <d:text xml:lang="ja">バイト</d:text>
3134    </d:cat>
3135    
3136    <d:cat name="Subject">
3137      <d:text xml:lang="en">Subject</d:text>
3138      <d:text xml:lang="ja">主語</d:text>
3139    </d:cat>
3140    
3141    <d:cat name="Predicate">
3142      <d:text xml:lang="en">Predicate</d:text>
3143      <d:text xml:lang="ja">述語</d:text>
3144    </d:cat>
3145    
3146    <d:cat name="Object">
3147      <d:text xml:lang="en">Object</d:text>
3148      <d:text xml:lang="ja">目的語</d:text>
3149    </d:cat>
3150    
3151    <d:cat name="character">
3152      <d:text xml:lang="en">character</d:text>
3153      <d:text xml:lang="ja">文字</d:text>
3154    </d:cat>
3155    
3156    <d:cat name="characters">
3157      <d:text xml:lang="en">characters</d:text>
3158      <d:text xml:lang="ja">文字</d:text>
3159    </d:cat>
3160    
3161    <d:cat name="Line #">
3162      <d:text xml:lang="en">Line <var>{text}</var></d:text>
3163      <d:text xml:lang="ja"><var>{text}</var> 行</d:text>
3164    </d:cat>
3165    
3166    <d:cat name="column #">
3167      <d:text xml:lang="en">column <var>{text}</var></d:text>
3168      <d:text xml:lang="ja"><var>{text}</var> 列</d:text>
3169    </d:cat>
3170    
3171    <d:cat name="Index #">
3172      <d:text xml:lang="en">Index <var>{text}</var></d:text>
3173      <d:text xml:lang="ja">索引 #<var>{text}</var></d:text>
3174    </d:cat>
3175    
3176    <d:cat name="Unknown location">
3177      <d:text xml:lang="en">Unknown location</d:text>
3178      <d:text xml:lang="ja">位置不明</d:text>
3179    </d:cat>
3180    
3181    <d:cat name="Table #">
3182      <d:text xml:lang="en">Structure of Table #<var>{text}</var></d:text>
3183      <d:text xml:lang="ja">表 #<var>{text}</var> の構造</d:text>
3184    </d:cat>
3185    
3186    <d:cat name="Subdocument #">
3187      <d:text xml:lang="en">Subdocument #<var>{text}</var></d:text>
3188      <d:text xml:lang="ja">部分文書 #<var>{text}</var></d:text>
3189    </d:cat>
3190    
3191    <d:cat name="Sub #">
3192      <d:text xml:lang="en">Sub #<var>{text}</var></d:text>
3193      <d:text xml:lang="ja">部分 #<var>{text}</var></d:text>
3194    </d:cat>
3195    
3196    <d:cat name="...">
3197      <d:text xml:lang="en">..</d:text><!-- TODO: figure hyphen? -->
3198      <d:text xml:lang="ja">〜</d:text>
3199    </d:cat>
3200    
3201    <d:cat name="Score">
3202      <d:text xml:lang="en">Score</d:text>
3203      <d:text xml:lang="ja">得点</d:text>
3204    </d:cat>
3205    
3206    <d:cat name="Subtotal">
3207      <d:text xml:lang="en">Subtotal</d:text>
3208      <d:text xml:lang="ja">小計</d:text>
3209    </d:cat>
3210    
3211    <d:cat name="Total">
3212      <d:text xml:lang="en">Total</d:text>
3213      <d:text xml:lang="ja">合計</d:text>
3214    </d:cat>
3215    
3216    <d:cat name="Main document">
3217      <d:text xml:lang="en">Main document</d:text>
3218      <d:text xml:lang="ja">主文書</d:text>
3219    </d:cat>
3220    
3221    <d:cat name="Subdocuments">
3222      <d:text xml:lang="en">Subdocuments</d:text>
3223      <d:text xml:lang="ja">部分文書</d:text>
3224    </d:cat>
3225    
3226    <d:cat name="Transfer L.">
3227      <d:text xml:lang="en"><abbr title="Transfer protocol">Transfer</abbr></d:text>
3228      <d:text xml:lang="ja"><abbr title="転送プロトコル">転送</abbr></d:text>
3229    </d:cat>
3230    
3231    <d:cat name="Encode L.">
3232      <d:text xml:lang="en"><abbr title="Character encoding">Encoding</abbr></d:text>
3233      <d:text xml:lang="ja"><abbr title="文字符号化">符号</abbr></d:text>
3234    </d:cat>
3235    
3236    <d:cat name="Char L.">
3237      <d:text xml:lang="en"><abbr title="Coded characters">Character</abbr></d:text>
3238      <d:text xml:lang="ja"><abbr title="符号化文字">文字</abbr></d:text>
3239    </d:cat>
3240    
3241    <d:cat name="Syntax L.">
3242      <d:text xml:lang="en">Syntax</d:text>
3243      <d:text xml:lang="ja">構文</d:text>
3244    </d:cat>
3245    
3246    <d:cat name="Structure L.">
3247      <d:text xml:lang="en">Structure</d:text>
3248      <d:text xml:lang="ja">構造</d:text>
3249    </d:cat>
3250    
3251    <d:cat name="Semantics L.">
3252      <d:text xml:lang="en">Semantics</d:text>
3253      <d:text xml:lang="ja">意味</d:text>
3254    </d:cat>
3255    
3256    <d:cat name="N/A">
3257      <d:text xml:lang="en">N/A</d:text>
3258      <d:text xml:lang="ja">−</d:text>
3259    </d:cat>
3260    
3261    <d:cat name="No error found.">
3262      <d:text xml:lang="en">No error found.</d:text>
3263      <d:text xml:lang="ja">誤りは見つかりませんでした。</d:text>
3264    </d:cat>
3265    
3266    <d:cat name="No transfer error found.">
3267      <d:text xml:lang="en">This document has no transfer protocol header error.</d:text>
3268      <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>
3269    </d:cat>
3270    
3271    <d:cat name="No parse error found.">
3272      <d:text xml:lang="en">This document has no parse error.</d:text>
3273      <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>
3274    </d:cat>
3275    
3276    <d:cat name="No structural error found.">
3277      <d:text xml:lang="en">This document has no structral error.</d:text>
3278      <d:text xml:lang="ja">構造上の誤りは見つかりませんでした。</d:text>
3279    </d:cat>
3280    
3281    <d:cat name="This checker is work in progress.">
3282      <d:text xml:lang="en">
3283        <p><strong>Important</strong>: This conformance checking service
3284        is <em>under development</em>.  The result above might be <em>wrong</em>.</p>
3285      </d:text>
3286      <d:text xml:lang="ja">
3287        <p><strong>重要</strong>: この適合性検査サービスは<em>開発中</em>です。
3288        この結果は<em>間違い</em>かもしれません。</p>
3289      </d:text>
3290    </d:cat>
3291    
3292    <d:cat name="Conformance is conforming">
3293      <d:text xml:lang="en">No conformance‐error is
3294          found in this document.</d:text>
3295      <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>
3296    </d:cat>
3297    
3298    <d:cat name="Conformance is should-error">
3299      <d:text xml:lang="en">This document
3300            is <strong>likely <em>non</em>-conforming</strong>, but in rare case
3301            it might be conforming.  The checker cannot determine whether
3302            this document is in the rare case or not.</d:text>
3303      <d:text xml:lang="ja">この文書は<strong>おそらく<em>不</em>適合</strong>ですが、
3304          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>
3305    </d:cat>
3306    
3307    <d:cat name="Conformance is non-conforming">
3308      <d:text xml:lang="en">This document is
3309            <strong><em>non</em>-conforming</strong>.</d:text>
3310      <d:text xml:lang="ja">この文書は<strong><em>不</em>適合</strong>です。</d:text>
3311    </d:cat>
3312    
3313    <d:cat name="Conformance is uncertain">
3314      <d:text xml:lang="en">The conformance
3315            checker cannot decide whether the document is conforming or
3316            not, since the document contains one or more unsupported
3317            features.  The document might or might not be conforming.</d:text>
3318      <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。
3319          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。
3320          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>
3321    </d:cat>
3322    
3323    <d:cat name="Error level m">
3324      <d:text xml:lang="en"><a href="../error-description#level-m"><em class="rfc2119">MUST</em>‐level
3325            error</a></d:text>
3326      <d:text xml:lang="ja"><a href="../error-description#level-m"><em class="rfc2119" title="REQUIRED">必須</em>級の誤り</a></d:text>
3327    </d:cat>
3328    
3329    <d:cat name="Error level s">
3330      <d:text xml:lang="en"><a href="../error-description#level-s"><em class="rfc2119">SHOULD</em>‐level
3331            error</a></d:text>
3332      <d:text xml:lang="ja"><a href="../error-description#level-s"><em class="rfc2119" title="RECOMMENDED">推奨</em>級の誤り</a></d:text>
3333    </d:cat>
3334    
3335    <d:cat name="Error level w">
3336      <d:text xml:lang="en"><a href="../error-description#level-w">Warning</a></d:text>
3337      <d:text xml:lang="ja"><a href="../error-description#level-w">警告</a></d:text>
3338    </d:cat>
3339    
3340    <d:cat name="Error level i">
3341      <d:text xml:lang="en"><a href="../error-description#level-i">Information</a></d:text>
3342      <d:text xml:lang="ja"><a href="../error-description#level-i">情報</a></d:text>
3343    </d:cat>
3344    
3345    <d:cat name="Error level u">
3346      <d:text xml:lang="en"><a href="../error-description#level-u">Not
3347          supported</a></d:text>
3348      <d:text xml:lang="ja"><a href="../error-description#level-u">未対応</a></d:text>
3349    </d:cat>
3350    
3351    <section id="levels">
3352    <h2>Error Levels</h2>
3353    
3354    <table id="levels-table">
3355    <thead>
3356    <tr><th scope="col">Level</th>
3357    <th scope="col">Conforming?</th>
3358    <th scope="col">Description</th>
3359    </tr>
3360    </thead>
3361    <tbody>
3362    <tr id="level-m" class="level-m">
3363    <th scope="row"><em class="rfc2119">MUST</em>‐level error</th>
3364    <td>Non‐conforming.</td>
3365    <td>A violation to a hard requirement of the specification.
3366    The document is non‐conforming.</td>
3367    </tr>
3368    <tr id="level-s" class="level-s">
3369    <th scope="row"><em class="rfc2119">SHOULD</em>‐level error</th>
3370    <td>Non‐conforming, but <em>in some case</em>
3371    conforming.</td>
3372    <td>A violation to a requirement of the specification.
3373    The violation might be legitimize in some case.  Otherwise,
3374    the document is non‐conforming.</td>
3375    </tr>
3376    <tr id="level-w" class="level-w">
3377    <th scope="row">Warning</th>
3378    <td>Conforming.</td>
3379    <td>A warning is an advice from the conformance checker to avoid
3380    to solve a problem in a confusing or possibly wrong way.
3381    It does not affect to the conformance of the document, and
3382    may sometimes be inappropriate.</td>
3383    </tr>
3384    <tr id="level-i" class="level-i">
3385    <th scope="row">Information</th>
3386    <td>Conforming.</td>
3387    <td>An informational message just provides an additional information
3388    on the feature used in the document or the status of the retrieval
3389    or so on.
3390    It does not affect to the conformance of the document.</td>
3391    </tr>
3392    <tr id="level-u" class="level-u">
3393    <th scope="row">Not supported</th>
3394    <td><em>Unknown</em>.</td>
3395    <td>Some feature that is not supported by the conformance checker
3396    is used in the document.</td>
3397    </tr>
3398    </tbody>
3399    </table>
3400  </section>  </section>
3401    
3402  <section id="license">  <section id="license">
3403  <h2>License of This Document</h2>  <h2>License of This Document</h2>
3404    
3405  <p>Copyright 2007 <a href="http://suika.fam.cx/~wakaba/who?">Wakaba</a></p>  <p>Copyright <time>2007</time>‐<time>2008</time>
3406  <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>
3407    <code class="mail">&lt;<a href="mailto:w@suika.fam.cx">w@suika.fam.cx</a>></code>.</p>
3408    
3409    <p>This document is free software; you can redistribute it
3410  and/or modify it under the same terms as Perl itself.</p>  and/or modify it under the same terms as Perl itself.</p>
3411  </section>  </section>
3412    
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