/[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 1.10 by wakaba, Tue Sep 4 11:40:02 2007 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="html5-tokenize-error">
15  <h2>HTML5 Parse Errors</h2>  <h2>HTML5 Parse Errors in Tokenization Stage</h2>
16    
17  <d:item name="after head"  <d:item name="after html"
18      class="parse-error">      class="parse-error">
19    <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>
20    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>
21    <d:desc xml:lang="en">    <d:desc xml:lang="en">
22      <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
23      but before the <code>body</code> element is opened.      <code>html</code> element has been closed.  The document is
24        non-conforming.</p>
25    
26        <p>Any content of the document other than comments
27        must be put into the <code>html</code> element.</p>
28      </d:desc>
29    </d:item>
30    
31    <d:item name="after body"
32        class="parse-error">
33      <d:message xml:lang="en">Tag <code>&lt;<var>$0</var>&gt;</code>
34      is not allowed after the end tag <code>&lt;/body></code>.</d:message>
35      <d:desc xml:lang="en">
36        <p>The start or end tag of an element appears after the
37        <code>body</code> element has been closed.  The document is
38        non-conforming.</p>
39    
40        <p>Any content of the document other than <code>head</code>
41        contents and comments must be put into the <code>body</code>
42        element.</p>
43      </d:desc>
44    </d:item>
45    
46    <d:item name="bare ero"
47        class="tokenize-error">
48      <d:message xml:lang="en">The <code>&amp;</code> character must
49      introduce a reference.</d:message>
50      <d:desc xml:lang="en">
51        <p>An <code>&amp;</code> (<code>U+0026</code>
52        <code class="charname">AMPERSAND</code>) character which
53        is not part of any reference appears in the input stream.
54        The document is non-conforming.</p>
55    
56        <p><strong>Any <code>&amp;</code> character in URI (or IRI)
57        must be escaped as <code>&amp;amp;</code>.</strong></p>
58    
59        <p>The <code>&amp;</code> character must
60        be the first character of a reference:
61          <dl>
62          <dt>Named entity reference</dt>
63              <dd><pre class="html example"><code>&amp;<var>entity-name</var>;</code></pre>
64              where <var>entity-name</var> is the name of the
65              character entity to be referenced.</dd>
66          <dt>Numeric character reference</dt>
67              <dd><pre class="html example"><code>&amp;#<var>d</var>;</code></pre>
68              where <var>d</var> is the decimal representation of
69              the code position of the character to be referenced.</dd>
70          <dt>Hexadecimal character reference</dt>
71              <dd><pre class="html example"><code>&amp;#x<var>h</var>;</code></pre>
72              where <var>h</var> is the hexadecimal representation
73              of the code position of the character to be referenced.</dd>
74          </dl>
75        </p>
76    
77        <p>To represent <code>&amp;</code> as a data character, use
78        named entity reference:
79          <pre class="html example"><code>&amp;amp;</code></pre>
80        </p>
81      </d:desc>
82    </d:item>
83    
84    <d:item name="bare etago"
85        class="tokenize-error">
86      <d:message xml:lang="en">A <code>&lt;/</code> string is not followed
87      by a tag name.</d:message><!-- </ EOF -->
88      <d:desc xml:lang="en">
89        <p>There is a <code>&lt;</code> (<code>U+003C</code>
90        <code class="charname">LESS-THAN SIGN</code>) character
91        immediately followed by a <code>/</code> (<code>U+005F</code>
92        <code>SOLIDUS</code>) character, which is not part
93        of any end tag, in the input stream.  The document
94        is non-conforming.</p>
95    
96        <p>The <code>&lt;/</code> sequence immediately followed
97        by an <abbr title="End of file pseudo-character">EOF</abbr> is
98        interpreted as a string data of <code>&lt;/</code>.</p>
99    
100        <p>The <code>&lt;/</code> sequence as string data must
101        be escaped as:
102        <pre class="html example"><code>&amp;lt;/</code></pre>
103        </p>
104      </d:desc>
105    </d:item>
106    
107    <d:item name="bare stago"
108        class="tokenize-error">
109      <d:message xml:lang="en">A <code>&lt;</code> character is not followed
110      by tag name or by a <code>!</code> character.</d:message>
111      <d:desc xml:lang="en">
112        <p>A <code>&lt;</code> (<code>U+003C</code>
113        <code class="charname">LESS-THAN SIGN</code>) character which is not part
114        of any markup appears in the input stream.</p>
115    
116        <p>The <code>&lt;</code> character as a data character must
117        be escaped as:
118        <pre class="html example"><code>&amp;lt;</code></pre>
119        </p>
120      </d:desc>
121    </d:item>
122    
123    <d:item name="bare nero"
124        class="tokenize-error">
125      <d:message xml:lang="en">The decimal representation of the code position
126      of a character must be specified after <code>&amp;#</code>.</d:message>
127      <d:desc xml:lang="en">
128        <p>An <code>&amp;</code> (<code>U+0026</code>
129        <code class="charname">AMPERSAND</code>) character immediately
130        followed by a <code>#</code> (<code>U+0023</code>
131        <code>NUMBER SIGN</code>) character which
132        is not part of any reference appears in the input stream.
133      The document is non-conforming.</p>      The document is non-conforming.</p>
134    
135        <p>The string <code>&amp;#</code> must be the first two characters
136        of a reference:
137          <dl>
138          <dt>Numeric character reference</dt>
139              <dd><pre class="html example"><code>&amp;#<var>d</var>;</code></pre>
140              where <var>d</var> is the decimal representation of
141              the code point of the character to be referenced.</dd>
142          <dt>Hexadecimal character reference</dt>
143              <dd><pre class="html example"><code>&amp;#x<var>h</var>;</code></pre>
144              where <var>h</var> is the hexadecimal representation
145              of the code point of the character to be referenced.</dd>
146          </dl>
147        </p>
148    
149        <p>To represent <code>&amp;#</code> as data characters, use
150        a named entity reference for the <code>&amp;</code> character:
151          <pre class="html example"><code>&amp;amp;#</code></pre>
152        </p>
153      </d:desc>
154    </d:item>
155    
156    <d:item name="bare hcro"
157        class="tokenize-error">
158      <d:message xml:lang="en">The hexadecimal representation of the code position
159      of a character must be specified after <code>&amp;#x</code>.</d:message>
160      <d:desc xml:lang="en">
161       <p>The string <code>&amp;#x</code> or <code>&amp;#X</code> which
162       is not part of any reference appears in the input stream.
163        The document is non-conforming.</p>
164    
165        <p>The string <code>&amp;#x</code> or <code>&amp;#X</code> must
166        be the first three characters of a hexadecimal reference:
167          <pre class="html example"><code>&amp;#x<var>h</var>;</code></pre>
168        where <var>h</var> is the hexadecimal representation
169        of the code point of the character to be referenced.</p>
170    
171        <p>To represent <code>&amp;#x</code> as data characters, use
172        a named entity reference for the <code>&amp;</code> character:
173          <pre class="html example"><code>&amp;amp;#x</code></pre>
174        </p>
175      </d:desc>
176    </d:item>
177    
178    <d:item name="bogus comment"
179        class="tokenize-error">
180      <d:message xml:lang="en">String <code>&lt;!</code> is not followed
181      by <code>--</code>.</d:message>
182      <d:desc xml:lang="en">
183        <p>There is a <code>&lt;</code> (<code>U+003C</code>
184        <code class="charname">LESS-THAN SIGN</code>) character
185        followed by a <code>!</code> (<code>U+0021</code>
186        <code class="charname">EXCLAMATION MARK</code>) character,
187        which is not followed by a <code>--</code> or
188        <code>!DOCTYPE</code>.  The document is non-conforming.</p>
189    
190        <dl class="switch">
191        <dt>Comments</dt>
192          <dd>In HTML documents, comments must be introduced by
193          <code>&lt;!--</code> (<code>&lt;!</code> <em>immediately</em> followed
194          by <em>two</em> <code>-</code>s) and must be terminated by
195          <code>--></code>.  Strings <code>&lt;!</code> not followed
196          by <code>--</code> and <code>&lt;!-</code> not followed by
197          <code>-</code> are not valid open delimiters for comments.</dd>
198        <dt>Marked sections, including <code>CDATA</code> sections</dt>
199          <dd>Marked sections are not allowed in HTML documents.</dd>
200        <dt>Markup declarations</dt>
201          <dd>Markup declarations, except <code>DOCTYPE</code>
202          and comment declarations, are not allowed in HTML documents.</dd>
203        <dt>String <code>&lt;!</code></dt>
204          <dd>String <code>&lt;!</code> must be escaped as
205          <code>&amp;lt;!</code>.</dd>
206        </dl>
207      </d:desc>
208    </d:item>
209    
210    <d:item name="bogus end tag"
211        class="tokenize-error">
212      <d:message xml:lang="en">String <code>&lt;/</code> is not followed
213      by tag name.</d:message><!-- </ non-name-start-char-non-EOF -->
214      <d:desc xml:lang="en">
215        <p>There is a <code>&lt;</code> (<code>U+003C</code>
216        <code class="charname">LESS-THAN SIGN</code>) character
217        immediately followed by a <code>/</code> (<code>U+005F</code>
218        <code>SOLIDUS</code>) character, which is not part
219        of any end tag, in the input stream.  The document
220        is non-conforming.</p>
221    
222        <p>The <code>&lt;/</code> sequence not followed by a
223        tag name is parsed as an opening of bogus comment.</p>
224    
225        <p>The <code>&lt;/</code> sequence as string data must
226        be escaped as:
227        <pre class="html example"><code>&amp;lt;/</code></pre>
228        </p>
229      </d:desc>
230    </d:item>
231    
232    <d:item name="dash in comment"
233        class="tokenize-error">
234      <d:message xml:lang="en">There is a <code>--</code> sequence
235      in a comment.</d:message>
236      <d:desc xml:lang="en">
237        <p>There is a <code>-</code> (<code>U+002D</code>
238        <code class="charname">HYPHEN-MINUS</code>) character
239        at the end of the comment or a <code>--</code> sequence
240        in the comment.  The document is non-conforming.</p>
241    
242        <p>Comments cannot contain a string <code>--</code>, as in XML.
243        Unlike SGML, there cannot be more than one comments
244        (where <i>comment</i> is an SGML term) in the comment
245        declaration.</p>
246    </d:desc>    </d:desc>
247  </d:item>  </d:item>
248    
249  <d:item name="duplicate attribute"  <d:item name="duplicate attribute"
250      class="tokenize-error">      class="tokenize-error">
251    <d:message xml:lang="en">There are two attributes with same name.</d:message>    <d:message xml:lang="en">There are two attributes with name
252          <code><var>$0</var></code>.</d:message>
253    <d:desc xml:lang="en">    <d:desc xml:lang="en">
254      <p>Attributes must be unique in an element.  Specifying      <p>There are more than one attributes with the same
255      attributes with same name more than once is non-conforming.</p>      name in a tag.  The document is non-conforming.</p>
256    
257      <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.
258      Use <code>img</code> element with animation GIF instead.</p>      Use <code>img</code> element with animation GIF instead.</p>
# Line 39  Web Document Conformance Checker (BETA)< Line 261  Web Document Conformance Checker (BETA)<
261    
262  <d:item name="nestc"  <d:item name="nestc"
263      class="tokenize-error">      class="tokenize-error">
264    <d:message xml:lang="en">Void element syntax (<code>/></code>) cannot be    <d:message xml:lang="en">Polytheistic slash (<code>/></code>) cannot be
265    used for this element.</d:message>    used for this element.</d:message>
266    <d:desc xml:lang="en">    <d:desc xml:lang="en">
267      <p>The void element syntax <code>/></code> syntax can only be      <p>Polytheistic slash (<code>/></code>) must not be used
268        for the element.  The document is non-conforming.</p>
269    
270        <p>The polytheistic slash can only be
271      used for <code>base</code>, <code>link</code>, <code>meta</code>,      used for <code>base</code>, <code>link</code>, <code>meta</code>,
272      <code>hr</code>, <code>br</code>, <code>img</code>,      <code>hr</code>, <code>br</code>, <code>img</code>,
273      <code>embed</code>, <code>param</code>, <code>area</code>,      <code>embed</code>, <code>param</code>, <code>area</code>,
274      <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>  
275    
276      <p>Unlike XML, the void element syntax (<code>/></code>) has      <dl>
277        <dt><code>&lt;script/></code></dt>
278            <dd><p>The polytheistic slash cannot be used for <code>script</code>
279            element.  Even for an empty <code>script</code> element,
280            there must be an explicit end tag <code>&lt;/script></code>.</p>
281    
282            <p><strong>NOTE</strong>: Though some user agents interpret
283            polytheistic slash for <code>script</code> element as the
284            closing of the element, such usage is not allowed under
285            the current standard.</p></dd>
286        <dt><code>&lt;basefont/></code>, <code>&lt;bgsound/></code>,
287        <code>&lt;frame/></code>, <code>&lt;keygen/></code>,
288        <code>&lt;spacer/></code>, <code>&lt;wbr/></code></dt>
289            <dd>These elements are themselves non-conforming.</dd>
290        <!-- isindex, image -->
291        <dt><code>&lt;command/></code>, <code>&lt;event-source/></code>,
292        <code>&lt;source/></code></dt>
293            <dd>Future revision of HTML5 parsing algorithm is expected
294            to allow polytheistic slash for these elements.</dd>
295        <dt><code>&lt;a/></code>, <code>&lt;p/></code></dt>
296            <dd>These elements are not always empty and therefore
297            polytheistic slash is not allowed.</dd>
298        </dl>
299    
300        <p>Note that, unlike in XML, the polytheistic slash has
301      no effect in HTML.</p>      no effect in HTML.</p>
302    </d:desc>    </d:desc>
303  </d:item>  </d:item>
304    
305    
306    <d:item name="pio"
307        class="tokenize-error">
308      <d:message xml:lang="en">Processing instruction
309      (<code>&lt;?<var>...</var>></code>) cannot be used.</d:message>
310      <d:desc xml:lang="en">
311        <p>Processing instructions (<code>&lt;?<var>...</var>?></code>),
312        including XML declaration (<code>&lt;?xml <var>...</var>?></code>)
313        and XML style sheet <abbr title="processing instruction">PI</abbr>
314        (<code>&lt;?xml-stylesheet <var>...</var>?></code>), are not allowed
315        in the HTML syntax.  The document is non-conforming.</p>
316    
317        <dl>
318        <dt><code>&lt;?xml?&gt;</code> (XML declaration)</dt>
319            <dd>XML declaration is unnecessary for HTML documents.</dd>
320        <dt><code>&lt;?xml-stylesheet?></code> (XML style sheet
321        <abbr title="processing instruction">PI</abbr></dt>
322            <dd>Use HTML <code>link</code> element with <code>rel</code>
323            attribute set to <code>stylesheet</code> (or,
324            <code>alternate stylesheet</code> for an alternate style
325            sheet).</dd>
326        <dt><code>&lt;?php?&gt;</code> (PHP code)</dt>
327            <dd>The conformance checker does <em>not</em> support
328            checking for PHP source documents.</dd>
329        <dt>Other processing instructions</dt>
330            <dd>Processing instructions cannot be inserted in an HTML
331            document.  Use XML document or insert
332            <code>ProcessingInstruction</code> node by scripting.</dd>
333        </dl>
334    
335        <p>Web browsers will parse processing instructions as bogus
336        comments.  Some legacy Web browsers, such as IE:mac and
337        some mobile Web browsers, will display processing instructions
338        as string.</p>
339      </d:desc>
340    </d:item>
341    
342    </section>
343    
344    <section id="html5-parse-errors">
345    <h2>HTML5 Parse Errors in Tree Construction Stage</h2>
346    
347    <d:item name="after head"
348        class="parse-error">
349      <d:message xml:lang="en">The <code><var>$0</var></code> element cannot be
350      inserted between <code>head</code> and <code>body</code> elements.</d:message>
351      <d:desc xml:lang="en">
352        <p>A start tag appears after the <code>head</code> element is closed
353        but before the <code>body</code> element is opened.
354        The document is non-conforming.</p>
355      </d:desc>
356    </d:item>
357    
358    <d:item name="DOCTYPE in the middle"
359        class="parse-error">
360      <d:message xml:lang="en">A <code>DOCTYPE</code> appears after any
361      element or data character has been seen.</d:message>
362      <d:desc xml:lang="en">
363        <p>A <code>DOCTYPE</code> appears after any element or data character
364        has been seen.  The document is non-conforming.</p>
365        
366        <p>The <code>DOCTYPE</code> must be placed before any
367        tag, reference, or data character.  Only white space characters
368        and comments can be inserted before the <code>DOCTYPE</code>.</p>
369      </d:desc>
370    </d:item>
371    
372    <d:item name="in a:a"
373        class="parse-error">
374      <d:message xml:lang="en">Anchor cannot be nested.</d:message>
375      <d:desc xml:lang="en">
376        <p>HTML <code>a</code> elements cannot be nested.
377        The document is non-conforming.</p>
378    
379        <p>In the HTML syntax, a start tag of the <code>a</code>
380        implies the end tag of any opening <code>a</code> element.</p>
381      </d:desc>
382    </d:item>
383    
384    <d:item name="in body"
385        class="parse-error">
386      <d:message xml:lang="en">Tag <code>&lt;<var>$0</var>&gt;</code>
387      is not allowed in the <code>body</code> element.</d:message>
388      <d:desc xml:lang="en">
389        <p>The start or end tag of an element, which
390        cannot be a descendant of <code>body</code> element, appears
391        in the input stream while the <code>body</code> element has been opened.
392        The document is non-conforming.</p>
393      </d:desc>
394    </d:item>
395    
396    <d:item name="in head:head"
397        class="parse-error">
398      <d:message xml:lang="en">Start tag <code>&lt;head&gt;</code>
399      is not allowed in the <code>head</code> element.</d:message>
400      <d:desc xml:lang="en">
401        <p>There is a start tag <code>&lt;head></code> in the
402        <code>&lt;head></code> element.  The document is non-conforming.</p>
403    
404        <p>In an HTML document there must not be more than
405        one <code>head</code> element, therefore no more than one
406        start tag <code>&lt;head></code> can appear in the input stream.</p>
407      </d:desc>
408    </d:item>
409    
410    <d:item name="in table"
411        class="parse-error">
412      <d:message xml:lang="en">Tag <code>&lt;<var>$0</var>&gt;</code>
413      is not allowed in a <code>table</code> element.</d:message>
414      <d:desc xml:lang="en">
415        <p>The start or end tag of an element, which
416        cannot be a child of <code>table</code> element, appears
417        in the input stream while the <code>table</code> element has been opened
418        but no other element has been opened.  The document is non-conforming.</p>
419    
420        <p>In <code>table</code>, only table related elements
421        are allowed; any other element must be contained in
422        <code>td</code> or <code>th</code> element to form
423        a part of the table, or <code>caption</code> element to create
424        a table caption.</p>
425      </d:desc>
426    </d:item>
427    
428    <d:item name="in table:#character"
429        class="parse-error">
430      <d:message xml:lang="en">Data character is not allowed in
431      <code>table</code>.</d:message>
432      <d:desc xml:lang="en">
433        <p>A data character appears in <code>table</code>.  The document
434        is non-conforming.</p>
435    
436        <p>In <code>table</code>, only table related elements
437        are allowed; any other element and data character must be contained in
438        <code>td</code> or <code>th</code> element to form
439        a part of the table, or <code>caption</code> element to create
440        a table caption.</p>
441      </d:desc>
442    </d:item>
443    
444    <d:item name="missing start tag:tr"
445        class="parse-error">
446      <d:message xml:lang="en">Start tag of <code>tr</code>
447      element is missing.</d:message>
448      <d:desc>
449        <p>Start tag of a <code>tr</code> element, which is <em>not</em>
450        optional, is missing.  The document is non-conforming.</p>
451    
452        <p>In a table section, a <code>&lt;tr></code> start tag
453        must occur before any <code>&lt;td></code> or
454        <code>&lt;th></code> start tag.  Though the HTML5 parser
455        implies the <code>&lt;tr></code> start tag before
456        these start tags, it must be explicitly specified.</p>
457      </d:desc>
458    </d:item>
459    
460    <d:item name="no DOCTYPE"
461        class="parse-error">
462      <d:message xml:lang="en">This document does not start with a
463      <code>DOCTYPE</code>.</d:message>
464      <d:desc>
465        <p>The document does not start with a <code>DOCTYPE</code>.
466        The document is non-conforming.</p>
467    
468        <p>An HTML document must start by a <code>DOCTYPE</code>:
469          <pre class="html example"><code>&lt;!DOCTYPE HTML></code></pre>
470        </p>
471    
472        <p>Only white space characters and comments are allowed
473        before the <code>DOCTYPE</code>.</p>
474      </d:desc>
475    </d:item>
476    
477    <d:item name="not closed"
478        class="parse-error">
479      <d:message xml:lang="en">Element <code><var>$0</var></code> is not
480      closed.</d:message>
481      <d:desc>
482        <p>End tag of an element is not found before, for example,
483        an end tag of another element appears or
484        the end of the document.  The document is non-conforming.</p>
485    
486        <p>Only <code>body</code>, <code>dd</code>, <code>dt</code>,
487        <code>head</code>, <code>html</code>, <code>li</code>,
488        <code>ol</code>, <code>option</code>, <code>optgroup</code>,
489        <code>p</code>, <code>rb</code>, <code>rp</code>, <code>rt</code>, or
490        <code>ul</code> end tag can be implied in HTML documents.
491        For any element except for void element, there must be an explicit
492        end tag.</p>
493    
494        <p>Note that misnesting tags, such as
495        <code class="bad example">&lt;a>&lt;b>&lt;/a>&lt;/b></code>, are not
496        allowed and they also cause this error.</p>
497      </d:desc>
498    </d:item>
499    
500    <d:item name="not first start tag"
501        class="parse-error">
502      <d:message xml:lang="en">This <code>&lt;html></code> tag is not
503      the first start tag.</d:message>
504      <d:desc>
505        <p>There is a start tag of the <code>html</code> element
506        that it not the first start tag in the input stream.
507        The document is non-conforming.</p>
508    
509        <p>In an HTML document, there cannot be more than one
510        <code>html</code> element and therefore there cannot be
511        more than one <code>&lt;html></code> tag.  In addition,
512        nothing can be placed before the <code>&lt;html></code> tag
513        except a <code>DOCTYPE</code>, white space characters,
514        and comments.</p>
515      </d:desc>
516    </d:item>
517    
518    <d:item name="not HTML5"
519        class="parse-error">
520      <d:message xml:lang="en">This document is written in an old version of
521      HTML.</d:message>
522      <d:desc xml:lang="en">
523        <p>The document contains a <code>DOCTYPE</code> declaration
524        that is different from HTML5 <code>DOCTYPE</code> (i.e.
525        <code>&lt;!DOCTYPE HTML&gt;</code>).  The document is non-conforming.</p>
526    
527        <p>The document might or might not be conformant to
528        some version of HTML.  However, conformance to any HTML
529        specification other than HTML5 provides for no practical
530        convenience, since Web borwsers will parse any
531        HTML document (roughly) as defined in HTML5.</p>
532      </d:desc>
533    </d:item>
534    
535    <d:item name="unmatched end tag"
536        class="parse-error">
537      <d:message xml:lang="en">Element <code><var>$0</var></code> is not
538      opened.</d:message>
539      <d:desc>
540        <p>An end tag appears though no element with the same name
541        has been opened.  The document is non-conforming.</p>
542    
543        <p>For any end tag in HTML document, there must be a
544        corresponding start tag.</p>
545      </d:desc>
546    </d:item>
547    
548  </section>  </section>
549    
550  <section id="element-content-model-errors">  <section id="element-content-model-errors">
# Line 64  Web Document Conformance Checker (BETA)< Line 555  Web Document Conformance Checker (BETA)<
555    <d:message xml:lang="en">Data character is not allowed in this    <d:message xml:lang="en">Data character is not allowed in this
556    context.</d:message>    context.</d:message>
557    <d:desc xml:lang="en">    <d:desc xml:lang="en">
558      <p>A data character occurs where it is not allowed in this      <p>A data character appears where it is not allowed in this
559      context.  The document is non-conforming.</p>      context.  The document is non-conforming.</p>
560    
561      <p>Possible causes:      <p>Possible causes:
562        <dl>        <ul>
563        <dt>If the erred element is an inline-level element (such        <li><p>A data character cannot be a child
564        as <code>a</code> or <code>span</code>)</dt>        of certain sectioning elements such as <code>body</code>,
565            <dd><p>A data character cannot be a child        <code>section</code>, and <code>blockquote</code>.</p>
566            of certain sectioning elements such as <code>body</code>,  
567            <code>section</code>, and <code>blockquote</code>.</p>        <p>Any inline-level content must be put
568          in e.g. paragraph element such as <code>p</code>.</p></li>
569            <p>Any inline-level content must be put        <li><p>Though some elements such as <code>div</code>,
570            in e.g. paragraph element such as <code>p</code>.</p></dd>        <code>li</code>, and <code>td</code> allow
571        <dt>If the erred element is a block-level element (such as        <em>either one</em> of block-level or inline-level content
572        <code>div</code> or <code>h<var>n</var></code>)</dt>        is allowed.  If there is a block-level content,
573            <dd><p>Though some elements such as <code>div</code>,        any inline-level content must be put
574            <code>li</code>, and <code>td</code> allow        in e.g. paragraph element such as <code>p</code>.</p></li>
575            <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>  
576      </p>      </p>
577    </d:desc>    </d:desc>
578  </d:item>  </d:item>
# Line 97  Web Document Conformance Checker (BETA)< Line 584  Web Document Conformance Checker (BETA)<
584    <d:desc xml:lang="en">    <d:desc xml:lang="en">
585      <p>The content model of the element is so defined that it      <p>The content model of the element is so defined that it
586      must contain a <code><var>$0</var></code> child element.      must contain a <code><var>$0</var></code> child element.
587      Without such an element, the document is non-conforming.</p>      The document is non-conforming.</p>
588    
589      <p>For example:      <p>For example:
590        <ul>        <ul>
# Line 117  Web Document Conformance Checker (BETA)< Line 604  Web Document Conformance Checker (BETA)<
604    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>
605    <d:desc xml:lang="en">    <d:desc xml:lang="en">
606      <p>The <code>tr</code> element must contain at least one      <p>The <code>tr</code> element must contain at least one
607      <code>td</code> or <code>th</code> child element.  Without      <code>td</code> or <code>th</code> child element.  The document
608      such an element, the document is non-conforming.</p>      is non-conforming.</p>
609    </d:desc>    </d:desc>
610  </d:item>  </d:item>
611    
# Line 127  Web Document Conformance Checker (BETA)< Line 614  Web Document Conformance Checker (BETA)<
614    <d:message xml:lang="en">This element is not allowed in this    <d:message xml:lang="en">This element is not allowed in this
615    context.</d:message>    context.</d:message>
616    <d:desc xml:lang="en">    <d:desc xml:lang="en">
617      <p>An element occurs where it is not allowed.  The document      <p>An element appears where it is not allowed.  The document
618      is non-conforming.</p>      is non-conforming.</p>
619    
620      <p>Possible causes:      <p>Possible causes:
621        <dl>        <dl class="switch">
622        <dt>If the erred element is an inline-level element (such        <dt>If the element with the error is an inline-level element,
623        as <code>a</code> or <code>span</code>)</dt>        such as <code>a</code>, <code>progress</code>, or <code>img</code></dt>
624            <dd><p>An inline-level element cannot be a child            <dd><p>An inline-level element cannot be a child
625            of certain sectioning elements such as <code>body</code>,            of certain sectioning elements such as <code>body</code>,
626            <code>section</code>, and <code>blockquote</code>.</p>            <code>section</code>, and <code>blockquote</code>.</p>
627    
628            <p>Any inline-level content must be put            <p>Any inline-level content must be put
629            in e.g. paragraph element such as <code>p</code>.</p></dd>            in e.g. paragraph element such as <code>p</code>.</p></dd>
630        <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>,
631        <code>div</code> or <code>h<var>n</var></code>)</dt>        <code>div</code>, <code>h<var>n</var></code>,
632            <dd><p>Though some elements such as <code>div</code>,        <code>p</code>, or <code>section</code></dt>
633            <code>li</code>, and <code>td</code> allow            <dd><dl class="switch">
634            <em>either one</em> of block-level or inline-level content                <dt>If the parent element is <code>div</code>,
635            is allowed.  If there is a block-level content,                <code>li</code>, <code>td</code>, or <code>th</code></dt>
636            any inline-level content must be put                <!-- @@ TODO: more... -->
637            in e.g. paragraph element such as <code>p</code>.</p></dd>                    <!-- @@ TODO: <p><ul><li><p> -->
638        <dt>If the erred element is the root <code>html</code> element</dt>                    <dd><p>The parent element allows <em>either</em>
639                      block-level or inline-level content.  If there is a
640                      block-level content, any inline-level content must be
641                      put in e.g. paragraph element such as <code>p</code>.</p>
642                      <p>For example, an HTML document fragment
643                      <code class="bad example">&lt;div>&lt;p>Hello!&lt;/p> World!&lt;/div></code>
644                      is non-conforming, since a word <q>World!</q> does not belong
645                      to any paragraph.  (If not part of any paragraph, what is
646                      it!?)  A conforming example would be:
647                        <pre class="example"><code>&lt;div>&lt;p>Hello!&lt;/p> &lt;p>World!&lt;/p>&lt;/div></code></pre>
648                      </p></dd>
649                  <dt>If the parent element does <em>not</em> allow
650                  block-level elements as content</dt>
651                      <dd>The element is not allowed to be inserted here.
652                      For example, a <code>div</code> element cannot be
653                      a child of an <code>h1</code> element.</dd>
654              </dl></dd>
655          <dt>If the element with the error is a <code>noscript</code> element</dt>
656              <dd>The <code>noscript</code> element is allowed only in the context
657              where a block-level or inline-level content is expected
658              and in the <code>head</code> element.
659              It cannot be used in e.g. <code>ul</code>, <code>table</code>,
660              or <code>select</code>.</dd>
661          <dt>If the element with the error is the <code>html</code> element
662          that is the root element of an XHTML document</dt>
663            <dd><p>In an XHTML document, the root <code>html</code>            <dd><p>In an XHTML document, the root <code>html</code>
664            element must have an <code>xmlns</code> attribute            element must have an <code>xmlns</code> attribute
665            whose value is set to            whose value is set to
666            <code>http://www.w3.org/1999/xhtml</code>.</p></dd>            <code>http://www.w3.org/1999/xhtml</code>.</p></dd>
667          <dt>If the element with the error is <code>blink</code>,
668          <code>center</code>, or <code>marquee</code> element</dt>
669              <dd>These elements are not part of the HTML standard.
670              Use CSS for styling control.</dd>
671    
672          <dt><code>button</code>, <code>datalist</code>, <code>form</code>,
673          <code>input</code>, <code>label</code>,
674          <code>optgroup</code>, <code>option</code>, <code>output</code>,
675          <code>rb</code>, <code>rp</code>, <code>rt</code>, <code>ruby</code>,
676          <code>textarea</code>, or <code>textarea</code> element</dt>
677          <!-- rbc, rtc ? -->
678              <dd>These elements are intentionally not supported by the conformance
679              checker <em>yet</em>.</dd>
680        </dl>        </dl>
681      </p>      </p>
682    </d:desc>    </d:desc>
683  </d:item>  </d:item>
684    
685  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="ps element missing"
686  no DOCTYPE;parse-error;This document does not start with the <code>DOCTYPE</code> declaration.      class="content-model-error">
687  not HTML5;parse-error;This document is written in an old version of HTML.    <d:message xml:lang="en">There is no <code><var>$0</var></code>
688  not closed;parse-error;Element <code>$0</code> is not closed.    element before this element.</d:message>
689  unmatched end tag;parse-error;Element <code>$0</code> is not opened.    <d:desc xml:lang="en">
690        <p>There must be an element before another element, but there
691  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.      is not.  The document is non-conforming.</p>
692    
693  s:IMT:obsolete subtype;should;An <em>obsolete</em> subtype is used.      <p>For example, there must be a <code>dt</code> element
694  s:IMT:private subtype;should;A private (<code>x-</code> or <code>x.</code>) subtype is used.      before any <code>dd</code> element.</p>
695  s:IMT:unregistered subtype;should;The subtype is not registered to IANA.    </d:desc>
696    </d:item>
697    
698    </section>
699    
700    <section id="attribute-errors">
701    <h2>Attribute Errors</h2>
702    
703    <d:item name="attribute missing"
704        class="attribute-error">
705      <d:message xml:lang="en">Required attribute <code><var>$0</var></code>
706      is not specified.</d:message>
707      <d:desc>
708        <p>A required attribute is not specified.  The document
709        is non-conforming.</p>
710    
711        <p>Some attribute is defined as <i>required</i>.
712        Without required attributes specified, user agents
713        cannot provide full functionality of the element to the user.</p>
714    
715        <dl class="switch">
716        <dt>HTML <code>img</code> element</dt>
717            <dd>The <code>src</code> attribute must be specified.
718            Additionally, the <code>alt</code> attribute must be specified
719            in many cases.</dd>
720        <dt>HTML <code>link</code> element</dt>
721            <dd>The <code>rel</code> attribute must be specified.
722            Note that the <code>rev</code> attribute is obsolete.</dd>
723        </dl>
724      </d:desc>
725    </d:item>
726    
727    <d:item name="attribute not allowed" class="attribute-error">
728      <d:message xml:lang="en">Attribute
729      <code><var>{local-name}</var></code> is not allowed for
730      <code><var>{element-local-name}</var></code> element.</d:message>
731      <d:desc xml:lang="en">
732        <p>An attribute is specified where it is not allowed.
733        The document is non-conforming.</p>
734    
735        <dl>
736        <dt>HTML <code>meta</code> element</dt>
737            <dd>For HTML <code>meta</code> element, <em>only one</em> of
738            <code>name</code>, <code>http-equiv</code>, or <code>charset</code>
739            attribute is allowed.</dd>
740        </dl>
741      </d:desc>
742    </d:item>
743    
744    <d:item name="in HTML:xml:lang"
745        class="attribute-error">
746      <d:message xml:lang="en">The <code>xml:lang</code> attribute is not
747      allowed in HTML document.</d:message>
748      <d:desc xml:lang="en">
749        <p>The <code>xml:lang</code> attribute is not allowed in
750        HTML document.  The document is non-conforming.</p>
751    
752        <p>Use of the <code>xml:lang</code> attribute is conforming
753        <em>only</em> in XML documents.</p>
754    
755        <p>To specify natural language information in HTML document,
756        use <code>lang</code> attribute instead.</p>
757    
758        <p>XHTML 1.0 Appendix C was encouraged to specify both
759        <code>lang</code> and <code>xml:lang</code> attributes with
760        the same value.  Such a duplication has <em>no effect</em> in practice.
761        Use only one of <code>lang</code> (in HTML) or <code>xml:lang</code> (in
762        XML).</p>
763    
764        <!-- @@ ISSUE: xml:lang in non-HTML element in DOM5 HTML created
765             from an HTML document? -->
766      </d:desc>
767    </d:item>
768    
769    <d:item name="in XML:charset"
770        class="attribute-error">
771      <d:message xml:lang="en">The <code>charset</code> attribute is not
772      allowed in XML document.</d:message>
773      <d:desc>
774        <p>The <code>charset</code> attribute of a
775        <code>meta</code> element is not allowed in XML document.
776        The document is non-conforming.</p>
777    
778        <p>To specify the character encoding used for serialization,
779        if necessary, use XML declaration instead:
780          <pre class="xml example"><code>&lt;?xml version="1.0" encoding="<var>encoding-name</var>"?></code></pre>
781        </p>
782      </d:desc>
783    </d:item>
784    
785    <d:item name="in XML:lang"
786        class="attribute-error">
787      <d:message xml:lang="en">The <code>lang</code> attribute is not
788      allowed in XML document.</d:message>
789      <d:desc>
790        <p>The HTML <code>lang</code> attribute is not allowed in
791        XML document.  The document is non-conforming.</p>
792    
793        <p>The <code>lang</code> attribute in <code>null</code>
794        namespace for HTML elements is conforming <em>only</em> in
795        HTML documents.</p>
796    
797  s:URI::empty path;should;This IRI should explicitly end with <code>/</code>.      <p>To specify natural language information in XML document,
798  m:URI::syntax error;must;This IRI is not syntactically valid.      use <code>xml:lang</code> attribute instead.</p>
799      </d:desc>
800    </d:item>
801    
802    <d:item name="in XML:xmlns"
803        class="attribute-error">
804      <d:message xml:lang="en">The <code>xmlns</code> attribute
805      in the <code>null</code> namespace is not allowed in
806      XHTML document.  The document is non-conforming.</d:message>
807      <d:desc>
808        <p>The <code>xmlns</code> attribute in the <code>null</code>
809        namespace is not allowed in XHTML document.</p>
810    
811        <p>This error should not occur in conformance-checking of
812        static documents.</p>
813      </d:desc>
814    </d:item>
815    
816    </section>
817    
818    <section id="attribute-value-errors">
819    <h2>Attribute Value Errors</h2>
820    
821    <d:item name="enumerated:invalid"
822        class="attribute-value-error">
823      <d:message xml:lang="en">This attribute only allow a limited set of
824      values and the specified value <code><var>{@}</var></code> is not one
825      of them.</d:message>
826      <d:desc xml:lang="en">
827        <p>For this attribute only several values are allowed and the
828        value of the attribute is not one of them.  The document
829        is non-conforming.</p>
830    
831        <dl>
832        <dt>HTML <code>meta</code> element, <code>http-equiv</code> attribute</dt>
833            <dd><p>Only <code>Default-Style</code> and <code>Refresh</code>
834            is allowed.</p>
835            <p>Value <code>Content-Type</code> is obsolete; for charset
836            declaration, the <code>charset</code> attribute can be used as:
837            <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
838            ... where <var>charset-name</var> is a name of the character encoding
839            of the document, such as <code>utf-8</code>.</p>
840            <p>Values <code>Content-Style-Type</code> and
841            <code>Content-Script-Type</code> are currently not allowed.</p>
842            <p>Value <code>Keywords</code> is not allowed.  Use
843            <code>name</code> attribute instead of <code>http-equiv</code>
844            attribute.</p>
845            <p>Values <code>Expires</code>, <code>Pragma</code>,
846            and <code>Cache-Control</code> are not allowed;
847            use <em>real</em> HTTP header fields for cache control.</p></dd>
848        </dl>
849      </d:desc>
850    </d:item>
851    
852    <d:item name="duplicate ID"
853        class="attribute-value-error">
854      <d:message xml:lang="en">This identifier has already been
855      assigned to another element.</d:message>
856      <!-- @@ <id=a xml:id=a>? -->
857    </d:item>
858    
859    <d:item name="link type:bad context"
860        class="attribute-value-error">
861      <d:message xml:lang="en">The link type <code><var>$0</var></code>
862      cannot be specified for this element.</d:message>
863      <d:desc xml:lang="en">
864        <p>The specified link type cannot be used for the element.
865        The document is non-conforming.</p>
866    
867        <p>Link types are associated with limited set of elements.
868        They cannot be used with other elements.</p>
869    
870        <p>For example, link type <code>bookmark</code>
871        can be used with <code>a</code> or <code>area</code> element,
872        while it cannot be used with <code>link</code> element.</p>
873      </d:desc>
874    </d:item>
875    
876    <d:item name="link type:non-conforming"
877        class="attribute-value-error">
878      <d:message xml:lang="en">The link type <code><var>$0</var></code>
879      is non-conforming.</d:message>
880      <d:desc xml:lang="en">
881        <p>The specified link type is non-conforming, and therefore
882        the document is non-conforming.</p>
883    
884        <dl>
885        <dt>Link type <code>contents</code></dt>
886          <dd>Use link type <code>index</code>.</dd>
887        <dt>Link type <code>copyright</code></dt>
888          <dd>Use link type <code>license</code>.</dd>
889        <dt>Link type <code>home</code></dt>
890          <dd>Use link type <code>index</code>.</dd>
891        <dt>Link type <code>start</code></dt>
892          <dd>Use link type <code>first</code>.</dd>
893        <dt>Link type <code>toc</code></dt>
894          <dd>Use link type <code>index</code>.</dd>
895        </dl>
896      </d:desc>
897    </d:item>
898    
899    <d:item name="reserved browsing context name"
900        class="attribute-value-error">
901      <d:message xml:lang="en">Browsing context name
902      <code><var>{@}</var></code> is reserved.</d:message>
903      <d:desc xml:lang="en">
904        <p>The specified browsing context name is reserved.
905        The document is non-conforming.</p>
906    
907        <p>Names of browsing contexts starting with <code>_</code>
908        (<code>U+005F</code> <code class="charname">LOW LINE</code>)
909        are reserved so that it must not be used.</p>
910    
911        <p>Old version of HTML, non-HTML markup languages, and
912        Web browsers define or implements special reserved
913        browsing context names <code>_blank</code>,
914        <code>_main</code>, and <code>_replace</code>.
915        However, they are <em>not</em> conforming attribute values.</p>
916      </d:desc>
917    </d:item>
918    
919    </section>
920    
921    <section id="attribute-value-warnings">
922    <h2>Attribute Value Warnings</h2>
923    
924    <d:item name="link type:proposed" level="s"
925        class="attribute-value-warning should">
926      <d:message xml:lang="en">Link type <code><var>$0</var></code>
927      is proposed but not accepted yet; it <em>should not</em> be
928      used until it has been accepted.</d:message>
929      <d:desc>
930        <p>The link type is in the <i>proposed</i> status; it
931        <em>should not</em> be used until it has been
932        accepted.</p>
933    
934        <p><strong>Warning</strong>: The data served to the
935        conforming checker might be out of date; it might have already
936        been accepted or rejected, depending on which the document
937        might be conforming or non-conforming.  See WHATWG Wiki
938        for the latest information.</p>
939      </d:desc>
940    </d:item>
941    
942    </section>
943    
944    <section id="table-model-errors">
945    <h2>Table Model Errors</h2>
946    
947    <d:item name="table:colspan creates column with no anchored cell"
948        class="table-model-error">
949      <d:message xml:lang="en">This <code>colspan</code> attribute
950      results in creating a table column that does not contain
951      any cell anchored to it.</d:message>
952    </d:item>
953    
954    <d:item name="table:no cell in last row"
955        class="table-model-error">
956      <d:message xml:lang="en">The table has no cell (<code>td</code> or
957      <code>th</code>) in the last row.</d:message>
958    </d:item>
959    
960    <d:item name="table:rowspan extends table"
961        class="table-model-error">
962      <d:message xml:lang="en">This <code>rowspan</code> attribute
963      results in creating a table row that does not contain
964      any cell anchored to it.</d:message>
965      <d:desc xml:lang="en">
966        <p>The <code>rowspan</code> attribute value of the cell
967        is so specified that it extends a table in the row axis.
968        However, the extended row does not contain any cell by itself.
969        The document is non-conforming.</p>
970    
971        <p>For example, the table below is non-conforming:
972          <pre class="html non-conforming example"><code>&lt;table>
973    &lt;tbody>
974    &lt;tr>&lt;td rowspan=2>&lt;/td>&lt;/tr>
975    &lt;/tbody>
976    &lt;/table></code></pre>
977        ... since the second row contains only
978        a cell that spans between first and second rows.</p>
979      </d:desc>
980    </d:item>
981    
982    </section>
983    
984    <section id="imt-warnings">
985    <h2>Internet Media Type Warnings</h2>
986    
987    <d:item name="IMT:obsolete subtype"
988        class="should" level="s">
989      <d:message xml:lang="en"><code><var>{@}</var></code>: An <em>obsolete</em>
990      subtype is used.</d:message>
991    </d:item>
992    
993    <d:item name="IMT:private subtype"
994        class="should" level="s">
995      <d:message xml:lang="en"><code><var>{@}</var></code>: A private
996      (<code>x-</code> or <code>x.</code>) subtype is used.</d:message>
997    </d:item>
998    
999    <d:item name="IMT:unregistered subtype"
1000        class="should" level="s">
1001      <d:message xml:lang="en"><code><var>{@}</var></code>: The subtype is
1002      not registered to IANA.</d:message>
1003    <!-- TODO: Unknown message?? -->
1004    </d:item>
1005    
1006    </section>
1007    
1008    <section id="uri-errors">
1009    <h2>URI (or IRI) Errors</h2>
1010    
1011    <d:item name="URI::syntax error"
1012        class="must" level="m">
1013      <d:message xml:lang="en">The specified value is syntactically not an IRI
1014      reference.</d:message>
1015      <d:desc xml:lang="en">
1016        <p>The specified value does not satisfy the syntactical requirements
1017        for IRI references.  The document is non-conforming.</p>
1018    
1019        <p>Possible causes:
1020          <ul>
1021          <li>The string might contain one or more white space characters.
1022          Especially, the <code> </code> (<code>U+0020</code>
1023          <code class="charname">SPACE</code>) character cannot be
1024          used in IRI references.</li>
1025          </ul>
1026        </p>
1027      </d:desc>
1028    </d:item>
1029    
1030    </section>
1031    
1032    <section id="uri-shoulds">
1033    <h2>URI (or IRI) Should-level Errors</h2>
1034    
1035    <d:item name="URI::dot-segment"
1036        class="should" level="s">
1037      <d:message xml:lang="en">A dot-segment (<code>.</code> or
1038      <code>..</code>) occurs in an absolute reference.</d:message>
1039      <d:desc>
1040        <p>Dot-segment (<code>.</code> or <code>..</code>) should
1041        not occur in an absolute reference.</p>
1042    
1043        <p>In relative references, dot-segments are used to represent
1044        the current (<code>.</code>) or the parent (<code>..</code>)
1045        hierarchy of the path.  Though they are also allowed
1046        in absolute references, it should be resolved to the
1047        canonical form before it has been published.</p>
1048      </d:desc>
1049    </d:item>
1050    
1051    <d:item name="URI::empty path"
1052        class="should" level="s">
1053      <d:message xml:lang="en">This IRI does not end with
1054      a <code>/</code>.</d:message>
1055    </d:item>
1056    
1057    <d:item name="URI::lowercase hexadecimal digit"
1058        class="should" level="s">
1059      <d:message xml:lang="en">A lowercase hexadecimal digit is used
1060      in percent-encoding.</d:message>
1061      <d:desc xml:lang="en">
1062        <p>The hexadecimal digit in percent-encoding string in the IRI
1063        is in lowercase.  Though the IRI <em>is</em> conforming,
1064        it should be in uppercase.</p>
1065      </d:desc>
1066    </d:item>
1067    
1068    <d:item name="URI::percent-encoded unreserved"
1069        class="should" level="s">
1070      <d:message xml:lang="en">An unreserved character is
1071      percent-encoded.</d:message>
1072      <d:desc xml:lang="en">
1073        <p>An unreserved character is percent-encoded in the IRI.
1074        Though it <em>is</em> conforming, it should be in the
1075        decoded (or bare) form.</p>
1076      </d:desc>
1077    </d:item>
1078    
1079    <d:item name="URI::uppercase scheme name"
1080        class="should" level="s">
1081      <d:message xml:lang="en">URI scheme name is in uppercase.</d:message>
1082      <d:desc xml:lang="en">
1083        <p>The scheme part of the IRI is written in uppercase letter.</p>
1084    
1085        <p>Uppercase scheme names are not required to be processed
1086        correctly.</p>
1087    <!-- @@
1088     RFC 3986 3.1.
1089     > Although schemes are case-
1090       insensitive, the canonical form is lowercase and documents that
1091       specify schemes must do so with lowercase letters.
1092    
1093     > An implementation ... should only produce lowercase scheme names for
1094       consistency.
1095    -->
1096      </d:desc>
1097    </d:item>
1098    
1099  </section>  </section>
1100    
1101  <section id="unsupported-messages">  <section id="unsupported-messages">
1102  <h2><i>Unsupported</i> Messages</h2>  <h2><i>Unsupported</i> Messages</h2>
1103    
1104  <d:item name="unsupported:attribute"  <d:item name="element"
1105      class="unsupported">      class="unsupported" level="unsupported">
1106    <d:message xml:lang="en">This attribute is not supported by the    <d:message xml:lang="en">Conformance checking for element
1107    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
1108      might not be conforming</em>.</d:message>
1109    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1110      <p>The conformant checker does not support the attribute.      <p>The conformant checker does not support the element.
1111      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
1112    </d:desc>    </d:desc>
1113  </d:item>  </d:item>
1114    
1115  <d:item name="unsupported:element"  <d:item name="attribute"
1116      class="unsupported">      class="unsupported" level="unsupported">
1117    <d:message xml:lang="en">This element is not supported by the    <d:message xml:lang="en">Conformance checking for attribute
1118    conformance checker; <em>it might or might not be conforming</em>.</d:message>    <code><var>{local-name}</var></code> of element
1119      <code><var>{element-local-name}</var></code> is not supported;
1120      <em>it might or might not be conforming</em>.</d:message>
1121    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1122      <p>The conformant checker does not support the element.      <p>The conformant checker does not support the attribute.
1123      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
1124    </d:desc>    </d:desc>
1125  </d:item>  </d:item>
1126    
1127  <d:item name="unsupported:link type"  <d:item name="link type"
1128      class="unsupported">      class="unsupported" level="unsupported">
1129    <d:message xml:lang="en">The link type <code>$0</code> is not standardized    <d:message xml:lang="en">Link type <code><var>$0</var></code> is not
1130    or registered at the time of the release of the conformance checker;    standardized or registered at the time of the release of the conformance
1131    <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
1132      registered</em>.</d:message>
1133    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1134      <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.
1135      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 1141  m:URI::syntax error;must;This IRI is not
1141      The link type might have been added to the registry since then.      The link type might have been added to the registry since then.
1142      In such case it might be conforming.  Otherwise, the      In such case it might be conforming.  Otherwise, the
1143      document is non-conforming.</p>      document is non-conforming.</p>
1144    
1145        <dl>
1146        <dt>Link types <code>shortcut icon</code></dt>
1147            <dd>Link type <code>shortcut</code> is not registered.
1148            Use only <code>icon</code> for linking to so-called favicon.</dd>
1149        </dl>
1150    </d:desc>    </d:desc>
1151  </d:item>  </d:item>
1152    
1153    <d:item name="event handler"
1154        class="unsupported" level="unsupported">
1155      <d:message xml:lang="en">Conformance checking for event handler attribute
1156      is not supported; <em>it might or might not be conforming.</em></d:message>
1157    </d:item>
1158    
1159    <d:item name="language tag"
1160        class="unsupported" level="unsupported">
1161      <d:message xml:lang="en">Conformance checking for language tag
1162      is not supported; <em>it might or might not be conforming.</em></d:message>
1163    </d:item>
1164    
1165    <d:item name="media query"
1166        class="unsupported" level="unsupported">
1167      <d:message xml:lang="en">Conformance checking for media query
1168      is not supported; <em>it might or might not be conforming.</em></d:message>
1169    </d:item>
1170    
1171    <d:item name="script"
1172        class="unsupported" level="unsupported">
1173      <d:message xml:lang="en">Conformance checking for script
1174      language <code><var>$0</var></code> is not supported;
1175      <em>it might or might not be conforming.</em></d:message>
1176    </d:item>
1177    
1178    <d:item name="style"
1179        class="unsupported" level="unsupported">
1180      <d:message xml:lang="en">Conformance checking for style
1181      language <code><var>$0</var></code> is not supported;
1182      <em>it might or might not be conforming.</em></d:message>
1183    </d:item>
1184    
1185  </section>  </section>
1186    
1187    <d:catalog>
1188    manakaiCompatMode:quirks;;Quirks Mode
1189    manakaiCompatMode:limited quirks;;Limited Quirks Mode
1190    manakaiCompatMode:no quirks;;No Quirks Mode
1191    
1192    manakaiIsHTML:1;;HTML Document
1193    manakaiIsHTML:0;;XML Document
1194    </d:catalog>
1195    
1196  <section id="license">  <section id="license">
1197  <h2>License of This Document</h2>  <h2>License of This Document</h2>
1198    
1199  <p>Copyright 2007 <a href="http://suika.fam.cx/~wakaba/who?">Wakaba</a></p>  <p>Copyright 2007 <a href="http://suika.fam.cx/~wakaba/who?" rel="author" xml:lang="ja">Wakaba</a></p>
1200  <p>This library is free software; you can redistribute it  <p>This document is free software; you can redistribute it
1201  and/or modify it under the same terms as Perl itself.</p>  and/or modify it under the same terms as Perl itself.</p>
1202  </section>  </section>
1203    
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