/[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 1.9 by wakaba, Mon Sep 3 14:30:46 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 42  Web Document Conformance Checker (BETA)< Line 264  Web Document Conformance Checker (BETA)<
264    <d:message xml:lang="en">Void element syntax (<code>/></code>) cannot be    <d:message xml:lang="en">Void element syntax (<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>Void element syntax (<code>/></code>) must not be used
268        for the element.  The document is non-conforming.</p>
269    
270        <p>The void element syntax 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 void element syntax 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            void element syntax 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 void element syntax 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            void element syntax is not allowed.</dd>
298        </dl>
299    
300        <p>Note that, unlike in XML, the void element syntax 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      </d:desc>
486    </d:item>
487    
488    <d:item name="not first start tag"
489        class="parse-error">
490      <d:message xml:lang="en">This <code>&lt;html></code> tag is not
491      the first start tag.</d:message>
492      <d:desc>
493        <p>There is a start tag of the <code>html</code> element
494        that it not the first start tag in the input stream.
495        The document is non-conforming.</p>
496    
497        <p>In an HTML document, there cannot be more than one
498        <code>html</code> element and therefore there cannot be
499        more than one <code>&lt;html></code> tag.  In addition,
500        nothing can be placed before the <code>&lt;html></code> tag
501        except a <code>DOCTYPE</code>, white space characters,
502        and comments.</p>
503      </d:desc>
504    </d:item>
505    
506    <d:item name="not HTML5"
507        class="parse-error">
508      <d:message xml:lang="en">This document is written in an old version of
509      HTML.</d:message>
510      <d:desc xml:lang="en">
511        <p>The document contains a <code>DOCTYPE</code> declaration
512        that is different from HTML5 <code>DOCTYPE</code> (i.e.
513        <code>&lt;!DOCTYPE HTML&gt;</code>).  The document is non-conforming.</p>
514    
515        <p>The document might or might not be conformant to
516        some version of HTML.  However, conformance to any HTML
517        specification other than HTML5 provides for no practical
518        convenience, since Web borwsers will parse any
519        HTML document (roughly) as defined in HTML5.</p>
520      </d:desc>
521    </d:item>
522    
523    <d:item name="unmatched end tag"
524        class="parse-error">
525      <d:message xml:lang="en">Element <code><var>$0</var></code> is not
526      opened.</d:message>
527      <d:desc>
528        <p>An end tag appears though no element with the same name
529        has been opened.  The document is non-conforming.</p>
530    
531        <p>For any end tag in HTML document, there must be a
532        corresponding start tag.</p>
533      </d:desc>
534    </d:item>
535    
536  </section>  </section>
537    
538  <section id="element-content-model-errors">  <section id="element-content-model-errors">
# Line 64  Web Document Conformance Checker (BETA)< Line 543  Web Document Conformance Checker (BETA)<
543    <d:message xml:lang="en">Data character is not allowed in this    <d:message xml:lang="en">Data character is not allowed in this
544    context.</d:message>    context.</d:message>
545    <d:desc xml:lang="en">    <d:desc xml:lang="en">
546      <p>A data character occurs where it is not allowed in this      <p>A data character appears where it is not allowed in this
547      context.  The document is non-conforming.</p>      context.  The document is non-conforming.</p>
548    
549      <p>Possible causes:      <p>Possible causes:
550        <dl>        <ul>
551        <dt>If the erred element is an inline-level element (such        <li><p>A data character cannot be a child
552        as <code>a</code> or <code>span</code>)</dt>        of certain sectioning elements such as <code>body</code>,
553            <dd><p>A data character cannot be a child        <code>section</code>, and <code>blockquote</code>.</p>
554            of certain sectioning elements such as <code>body</code>,  
555            <code>section</code>, and <code>blockquote</code>.</p>        <p>Any inline-level content must be put
556          in e.g. paragraph element such as <code>p</code>.</p></li>
557            <p>Any inline-level content must be put        <li><p>Though some elements such as <code>div</code>,
558            in e.g. paragraph element such as <code>p</code>.</p></dd>        <code>li</code>, and <code>td</code> allow
559        <dt>If the erred element is a block-level element (such as        <em>either one</em> of block-level or inline-level content
560        <code>div</code> or <code>h<var>n</var></code>)</dt>        is allowed.  If there is a block-level content,
561            <dd><p>Though some elements such as <code>div</code>,        any inline-level content must be put
562            <code>li</code>, and <code>td</code> allow        in e.g. paragraph element such as <code>p</code>.</p></li>
563            <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>  
564      </p>      </p>
565    </d:desc>    </d:desc>
566  </d:item>  </d:item>
# Line 97  Web Document Conformance Checker (BETA)< Line 572  Web Document Conformance Checker (BETA)<
572    <d:desc xml:lang="en">    <d:desc xml:lang="en">
573      <p>The content model of the element is so defined that it      <p>The content model of the element is so defined that it
574      must contain a <code><var>$0</var></code> child element.      must contain a <code><var>$0</var></code> child element.
575      Without such an element, the document is non-conforming.</p>      The document is non-conforming.</p>
576    
577      <p>For example:      <p>For example:
578        <ul>        <ul>
# Line 117  Web Document Conformance Checker (BETA)< Line 592  Web Document Conformance Checker (BETA)<
592    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>
593    <d:desc xml:lang="en">    <d:desc xml:lang="en">
594      <p>The <code>tr</code> element must contain at least one      <p>The <code>tr</code> element must contain at least one
595      <code>td</code> or <code>th</code> child element.  Without      <code>td</code> or <code>th</code> child element.  The document
596      such an element, the document is non-conforming.</p>      is non-conforming.</p>
597    </d:desc>    </d:desc>
598  </d:item>  </d:item>
599    
# Line 127  Web Document Conformance Checker (BETA)< Line 602  Web Document Conformance Checker (BETA)<
602    <d:message xml:lang="en">This element is not allowed in this    <d:message xml:lang="en">This element is not allowed in this
603    context.</d:message>    context.</d:message>
604    <d:desc xml:lang="en">    <d:desc xml:lang="en">
605      <p>An element occurs where it is not allowed.  The document      <p>An element appears where it is not allowed.  The document
606      is non-conforming.</p>      is non-conforming.</p>
607    
608      <p>Possible causes:      <p>Possible causes:
609        <dl>        <dl class="switch">
610        <dt>If the erred element is an inline-level element (such        <dt>If the element with the error is an inline-level element,
611        as <code>a</code> or <code>span</code>)</dt>        such as <code>a</code>, <code>progress</code>, or <code>img</code></dt>
612            <dd><p>An inline-level element cannot be a child            <dd><p>An inline-level element cannot be a child
613            of certain sectioning elements such as <code>body</code>,            of certain sectioning elements such as <code>body</code>,
614            <code>section</code>, and <code>blockquote</code>.</p>            <code>section</code>, and <code>blockquote</code>.</p>
615    
616            <p>Any inline-level content must be put            <p>Any inline-level content must be put
617            in e.g. paragraph element such as <code>p</code>.</p></dd>            in e.g. paragraph element such as <code>p</code>.</p></dd>
618        <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>,
619        <code>div</code> or <code>h<var>n</var></code>)</dt>        <code>div</code>, <code>h<var>n</var></code>,
620            <dd><p>Though some elements such as <code>div</code>,        <code>p</code>, or <code>section</code></dt>
621            <code>li</code>, and <code>td</code> allow            <dd><dl class="switch">
622            <em>either one</em> of block-level or inline-level content                <dt>If the parent element is <code>div</code>,
623            is allowed.  If there is a block-level content,                <code>li</code>, <code>td</code>, or <code>th</code></dt>
624            any inline-level content must be put                <!-- @@ TODO: more... -->
625            in e.g. paragraph element such as <code>p</code>.</p></dd>                    <!-- @@ TODO: <p><ul><li><p> -->
626        <dt>If the erred element is the root <code>html</code> element</dt>                    <dd><p>The parent element allows <em>either</em>
627                      block-level or inline-level content.  If there is a
628                      block-level content, any inline-level content must be
629                      put in e.g. paragraph element such as <code>p</code>.</p>
630                      <p>For example, an HTML document fragment
631                      <code class="bad example">&lt;div>&lt;p>Hello!&lt;/p> World!&lt;/div></code>
632                      is non-conforming, since a word <q>World!</q> does not belong
633                      to any paragraph.  (If not part of any paragraph, what is
634                      it!?)  A conforming example would be:
635                        <pre class="example"><code>&lt;div>&lt;p>Hello!&lt;/p> &lt;p>World!&lt;/p>&lt;/div></code></pre>
636                      </p></dd>
637                  <dt>If the parent element does <em>not</em> allow
638                  block-level elements as content</dt>
639                      <dd>The element is not allowed to be inserted here.
640                      For example, a <code>div</code> element cannot be
641                      a child of an <code>h1</code> element.</dd>
642              </dl></dd>
643          <dt>If the element with the error is a <code>noscript</code> element</dt>
644              <dd>The <code>noscript</code> element is allowed only in the context
645              where a block-level or inline-level content is expected
646              and in the <code>head</code> element.
647              It cannot be used in e.g. <code>ul</code>, <code>table</code>,
648              or <code>select</code>.</dd>
649          <dt>If the element with the error is the <code>html</code> element
650          that is the root element of an XHTML document</dt>
651            <dd><p>In an XHTML document, the root <code>html</code>            <dd><p>In an XHTML document, the root <code>html</code>
652            element must have an <code>xmlns</code> attribute            element must have an <code>xmlns</code> attribute
653            whose value is set to            whose value is set to
654            <code>http://www.w3.org/1999/xhtml</code>.</p></dd>            <code>http://www.w3.org/1999/xhtml</code>.</p></dd>
655          <dt>If the element with the error is <code>blink</code>,
656          <code>center</code>, or <code>marquee</code> element</dt>
657              <dd>These elements are not part of the HTML standard.
658              Use CSS for styling control.</dd>
659    
660          <dt><code>button</code>, <code>datalist</code>, <code>form</code>,
661          <code>input</code>, <code>label</code>,
662          <code>optgroup</code>, <code>option</code>, <code>output</code>,
663          <code>rb</code>, <code>rp</code>, <code>rt</code>, <code>ruby</code>,
664          <code>textarea</code>, or <code>textarea</code> element</dt>
665          <!-- rbc, rtc ? -->
666              <dd>These elements are intentionally not supported by the conformance
667              checker <em>yet</em>.</dd>
668        </dl>        </dl>
669      </p>      </p>
670    </d:desc>    </d:desc>
671  </d:item>  </d:item>
672    
673  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"
674  no DOCTYPE;parse-error;This document does not start with the <code>DOCTYPE</code> declaration.      class="content-model-error">
675  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>
676  not closed;parse-error;Element <code>$0</code> is not closed.    element before this element.</d:message>
677  unmatched end tag;parse-error;Element <code>$0</code> is not opened.    <d:desc xml:lang="en">
678        <p>There must be an element before another element, but there
679  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>
680    
681  s:IMT:obsolete subtype;should;An <em>obsolete</em> subtype is used.      <p>For example, there must be a <code>dt</code> element
682  s:IMT:private subtype;should;A private (<code>x-</code> or <code>x.</code>) subtype is used.      before any <code>dd</code> element.</p>
683  s:IMT:unregistered subtype;should;The subtype is not registered to IANA.    </d:desc>
684    </d:item>
685    
686    </section>
687    
688    <section id="attribute-errors">
689    <h2>Attribute Errors</h2>
690    
691    <d:item name="attribute missing"
692        class="attribute-error">
693      <d:message xml:lang="en">Required attribute <code><var>$0</var></code>
694      is not specified.</d:message>
695      <d:desc>
696        <p>A required attribute is not specified.  The document
697        is non-conforming.</p>
698    
699        <p>Some attribute is defined as <i>required</i>.
700        Without required attributes specified, user agents
701        cannot provide full functionality of the element to the user.</p>
702    
703        <dl class="switch">
704        <dt>HTML <code>img</code> element</dt>
705            <dd>The <code>src</code> attribute must be specified.
706            Additionally, the <code>alt</code> attribute must be specified
707            in many cases.</dd>
708        <dt>HTML <code>link</code> element</dt>
709            <dd>The <code>rel</code> attribute must be specified.
710            Note that the <code>rev</code> attribute is obsolete.</dd>
711        </dl>
712      </d:desc>
713    </d:item>
714    
715    <d:item name="attribute not allowed" class="attribute-error">
716      <d:message xml:lang="en">Attribute
717      <code><var>{local-name}</var></code> is not allowed for
718      <code><var>{element-local-name}</var></code> element.</d:message>
719      <d:desc xml:lang="en">
720        <p>An attribute is specified where it is not allowed.
721        The document is non-conforming.</p>
722    
723        <dl>
724        <dt>HTML <code>meta</code> element</dt>
725            <dd>For HTML <code>meta</code> element, <em>only one</em> of
726            <code>name</code>, <code>http-equiv</code>, or <code>charset</code>
727            attribute is allowed.</dd>
728        </dl>
729      </d:desc>
730    </d:item>
731    
732    <d:item name="in HTML:xml:lang"
733        class="attribute-error">
734      <d:message xml:lang="en">The <code>xml:lang</code> attribute is not
735      allowed in HTML document.</d:message>
736      <d:desc xml:lang="en">
737        <p>The <code>xml:lang</code> attribute is not allowed in
738        HTML document.  The document is non-conforming.</p>
739    
740        <p>Use of the <code>xml:lang</code> attribute is conforming
741        <em>only</em> in XML documents.</p>
742    
743        <p>To specify natural language information in HTML document,
744        use <code>lang</code> attribute instead.</p>
745    
746        <p>XHTML 1.0 Appendix C was encouraged to specify both
747        <code>lang</code> and <code>xml:lang</code> attributes with
748        the same value.  Such a duplication has <em>no effect</em> in practice.
749        Use only one of <code>lang</code> (in HTML) or <code>xml:lang</code> (in
750        XML).</p>
751    
752        <!-- @@ ISSUE: xml:lang in non-HTML element in DOM5 HTML created
753             from an HTML document? -->
754      </d:desc>
755    </d:item>
756    
757    <d:item name="in XML:charset"
758        class="attribute-error">
759      <d:message xml:lang="en">The <code>charset</code> attribute is not
760      allowed in XML document.</d:message>
761      <d:desc>
762        <p>The <code>charset</code> attribute of a
763        <code>meta</code> element is not allowed in XML document.
764        The document is non-conforming.</p>
765    
766        <p>To specify the character encoding used for serialization,
767        if necessary, use XML declaration instead:
768          <pre class="xml example"><code>&lt;?xml version="1.0" encoding="<var>encoding-name</var>"?></code></pre>
769        </p>
770      </d:desc>
771    </d:item>
772    
773    <d:item name="in XML:lang"
774        class="attribute-error">
775      <d:message xml:lang="en">The <code>lang</code> attribute is not
776      allowed in XML document.</d:message>
777      <d:desc>
778        <p>The HTML <code>lang</code> attribute is not allowed in
779        XML document.  The document is non-conforming.</p>
780    
781        <p>The <code>lang</code> attribute in <code>null</code>
782        namespace for HTML elements is conforming <em>only</em> in
783        HTML documents.</p>
784    
785  s:URI::empty path;should;This IRI should explicitly end with <code>/</code>.      <p>To specify natural language information in XML document,
786  m:URI::syntax error;must;This IRI is not syntactically valid.      use <code>xml:lang</code> attribute instead.</p>
787      </d:desc>
788    </d:item>
789    
790    <d:item name="in XML:xmlns"
791        class="attribute-error">
792      <d:message xml:lang="en">The <code>xmlns</code> attribute
793      in the <code>null</code> namespace is not allowed in
794      XHTML document.  The document is non-conforming.</d:message>
795      <d:desc>
796        <p>The <code>xmlns</code> attribute in the <code>null</code>
797        namespace is not allowed in XHTML document.</p>
798    
799        <p>This error should not occur in conformance-checking of
800        static documents.</p>
801      </d:desc>
802    </d:item>
803    
804    </section>
805    
806    <section id="attribute-value-errors">
807    <h2>Attribute Value Errors</h2>
808    
809    <d:item name="enumerated:invalid"
810        class="attribute-value-error">
811      <d:message xml:lang="en">This attribute only allow a limited set of
812      values and the specified value <code><var>{@}</var></code> is not one
813      of them.</d:message>
814      <d:desc xml:lang="en">
815        <p>For this attribute only several values are allowed and the
816        value of the attribute is not one of them.  The document
817        is non-conforming.</p>
818    
819        <dl>
820        <dt>HTML <code>meta</code> element, <code>http-equiv</code> attribute</dt>
821            <dd><p>Only <code>Default-Style</code> and <code>Refresh</code>
822            is allowed.</p>
823            <p>Value <code>Content-Type</code> is obsolete; for charset
824            declaration, the <code>charset</code> attribute can be used as:
825            <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
826            ... where <var>charset-name</var> is a name of the character encoding
827            of the document, such as <code>utf-8</code>.</p>
828            <p>Values <code>Content-Style-Type</code> and
829            <code>Content-Script-Type</code> are currently not allowed.</p>
830            <p>Value <code>Keywords</code> is not allowed.  Use
831            <code>name</code> attribute instead of <code>http-equiv</code>
832            attribute.</p>
833            <p>Values <code>Expires</code>, <code>Pragma</code>,
834            and <code>Cache-Control</code> are not allowed;
835            use <em>real</em> HTTP header fields for cache control.</p></dd>
836        </dl>
837      </d:desc>
838    </d:item>
839    
840    <d:item name="duplicate ID"
841        class="attribute-value-error">
842      <d:message xml:lang="en">This identifier has already been
843      assigned to another element.</d:message>
844      <!-- @@ <id=a xml:id=a>? -->
845    </d:item>
846    
847    <d:item name="link type:bad context"
848        class="attribute-value-error">
849      <d:message xml:lang="en">The link type <code><var>$0</var></code>
850      cannot be specified for this element.</d:message>
851      <d:desc xml:lang="en">
852        <p>The specified link type cannot be used for the element.
853        The document is non-conforming.</p>
854    
855        <p>Link types are associated with limited set of elements.
856        They cannot be used with other elements.</p>
857    
858        <p>For example, link type <code>bookmark</code>
859        can be used with <code>a</code> or <code>area</code> element,
860        while it cannot be used with <code>link</code> element.</p>
861      </d:desc>
862    </d:item>
863    
864    <d:item name="link type:non-conforming"
865        class="attribute-value-error">
866      <d:message xml:lang="en">The link type <code><var>$0</var></code>
867      is non-conforming.</d:message>
868      <d:desc xml:lang="en">
869        <p>The specified link type is non-conforming, and therefore
870        the document is non-conforming.</p>
871    
872        <dl>
873        <dt>Link type <code>contents</code></dt>
874          <dd>Use link type <code>index</code>.</dd>
875        <dt>Link type <code>copyright</code></dt>
876          <dd>Use link type <code>license</code>.</dd>
877        <dt>Link type <code>home</code></dt>
878          <dd>Use link type <code>index</code>.</dd>
879        <dt>Link type <code>start</code></dt>
880          <dd>Use link type <code>first</code>.</dd>
881        <dt>Link type <code>toc</code></dt>
882          <dd>Use link type <code>index</code>.</dd>
883        </dl>
884      </d:desc>
885    </d:item>
886    
887    <d:item name="reserved browsing context name"
888        class="attribute-value-error">
889      <d:message xml:lang="en">Browsing context name
890      <code><var>{@}</var></code> is reserved.</d:message>
891      <d:desc xml:lang="en">
892        <p>The specified browsing context name is reserved.
893        The document is non-conforming.</p>
894    
895        <p>Names of browsing contexts starting with <code>_</code>
896        (<code>U+005F</code> <code class="charname">LOW LINE</code>)
897        are reserved so that it must not be used.</p>
898    
899        <p>Old version of HTML, non-HTML markup languages, and
900        Web browsers define or implements special reserved
901        browsing context names <code>_blank</code>,
902        <code>_main</code>, and <code>_replace</code>.
903        However, they are <em>not</em> conforming attribute values.</p>
904      </d:desc>
905    </d:item>
906    
907    </section>
908    
909    <section id="attribute-value-warnings">
910    <h2>Attribute Value Warnings</h2>
911    
912    <d:item name="link type:proposed" level="s"
913        class="attribute-value-warning should">
914      <d:message xml:lang="en">Link type <code><var>$0</var></code>
915      is proposed but not accepted yet; it <em>should not</em> be
916      used until it has been accepted.</d:message>
917      <d:desc>
918        <p>The link type is in the <i>proposed</i> status; it
919        <em>should not</em> be used until it has been
920        accepted.</p>
921    
922        <p><strong>Warning</strong>: The data served to the
923        conforming checker might be out of date; it might have already
924        been accepted or rejected, depending on which the document
925        might be conforming or non-conforming.  See WHATWG Wiki
926        for the latest information.</p>
927      </d:desc>
928    </d:item>
929    
930    </section>
931    
932    <section id="table-model-errors">
933    <h2>Table Model Errors</h2>
934    
935    <d:item name="table:colspan creates column with no anchored cell"
936        class="table-model-error">
937      <d:message xml:lang="en">This <code>colspan</code> attribute
938      results in creating a table column that does not contain
939      any cell anchored to it.</d:message>
940    </d:item>
941    
942    <d:item name="table:no cell in last row"
943        class="table-model-error">
944      <d:message xml:lang="en">The table has no cell (<code>td</code> or
945      <code>th</code>) in the last row.</d:message>
946    </d:item>
947    
948    <d:item name="table:rowspan extends table"
949        class="table-model-error">
950      <d:message xml:lang="en">This <code>rowspan</code> attribute
951      results in creating a table row that does not contain
952      any cell anchored to it.</d:message>
953      <d:desc xml:lang="en">
954        <p>The <code>rowspan</code> attribute value of the cell
955        is so specified that it extends a table in the row axis.
956        However, the extended row does not contain any cell by itself.
957        The document is non-conforming.</p>
958    
959        <p>For example, the table below is non-conforming:
960          <pre class="html non-conforming example"><code>&lt;table>
961    &lt;tbody>
962    &lt;tr>&lt;td rowspan=2>&lt;/td>&lt;/tr>
963    &lt;/tbody>
964    &lt;/table></code></pre>
965        ... since the second row contains only
966        a cell that spans between first and second rows.</p>
967      </d:desc>
968    </d:item>
969    
970    </section>
971    
972    <section id="imt-warnings">
973    <h2>Internet Media Type Warnings</h2>
974    
975    <d:item name="IMT:obsolete subtype"
976        class="should" level="s">
977      <d:message xml:lang="en"><code><var>{@}</var></code>: An <em>obsolete</em>
978      subtype is used.</d:message>
979    </d:item>
980    
981    <d:item name="IMT:private subtype"
982        class="should" level="s">
983      <d:message xml:lang="en"><code><var>{@}</var></code>: A private
984      (<code>x-</code> or <code>x.</code>) subtype is used.</d:message>
985    </d:item>
986    
987    <d:item name="IMT:unregistered subtype"
988        class="should" level="s">
989      <d:message xml:lang="en"><code><var>{@}</var></code>: The subtype is
990      not registered to IANA.</d:message>
991    <!-- TODO: Unknown message?? -->
992    </d:item>
993    
994    </section>
995    
996    <section id="uri-errors">
997    <h2>URI (or IRI) Errors</h2>
998    
999    <d:item name="URI::syntax error"
1000        class="must" level="m">
1001      <d:message xml:lang="en">The specified value is syntactically not an IRI
1002      reference.</d:message>
1003      <d:desc xml:lang="en">
1004        <p>The specified value does not satisfy the syntactical requirements
1005        for IRI references.  The document is non-conforming.</p>
1006    
1007        <p>Possible causes:
1008          <ul>
1009          <li>The string might contain one or more white space characters.
1010          Especially, the <code> </code> (<code>U+0020</code>
1011          <code class="charname">SPACE</code>) character cannot be
1012          used in IRI references.</li>
1013          </ul>
1014        </p>
1015      </d:desc>
1016    </d:item>
1017    
1018    </section>
1019    
1020    <section id="uri-shoulds">
1021    <h2>URI (or IRI) Should-level Errors</h2>
1022    
1023    <d:item name="URI::dot-segment"
1024        class="should" level="s">
1025      <d:message xml:lang="en">A dot-segment (<code>.</code> or
1026      <code>..</code>) occurs in an absolute reference.</d:message>
1027      <d:desc>
1028        <p>Dot-segment (<code>.</code> or <code>..</code>) should
1029        not occur in an absolute reference.</p>
1030    
1031        <p>In relative references, dot-segments are used to represent
1032        the current (<code>.</code>) or the parent (<code>..</code>)
1033        hierarchy of the path.  Though they are also allowed
1034        in absolute references, it should be resolved to the
1035        canonical form before it has been published.</p>
1036      </d:desc>
1037    </d:item>
1038    
1039    <d:item name="URI::empty path"
1040        class="should" level="s">
1041      <d:message xml:lang="en">This IRI does not end with
1042      a <code>/</code>.</d:message>
1043    </d:item>
1044    
1045    <d:item name="URI::lowercase hexadecimal digit"
1046        class="should" level="s">
1047      <d:message xml:lang="en">A lowercase hexadecimal digit is used
1048      in percent-encoding.</d:message>
1049      <d:desc xml:lang="en">
1050        <p>The hexadecimal digit in percent-encoding string in the IRI
1051        is in lowercase.  Though the IRI <em>is</em> conforming,
1052        it should be in uppercase.</p>
1053      </d:desc>
1054    </d:item>
1055    
1056    <d:item name="URI::percent-encoded unreserved"
1057        class="should" level="s">
1058      <d:message xml:lang="en">An unreserved character is
1059      percent-encoded.</d:message>
1060      <d:desc xml:lang="en">
1061        <p>An unreserved character is percent-encoded in the IRI.
1062        Though it <em>is</em> conforming, it should be in the
1063        decoded (or bare) form.</p>
1064      </d:desc>
1065    </d:item>
1066    
1067    <d:item name="URI::uppercase scheme name"
1068        class="should" level="s">
1069      <d:message xml:lang="en">URI scheme name is in uppercase.</d:message>
1070      <d:desc xml:lang="en">
1071        <p>The scheme part of the IRI is written in uppercase letter.</p>
1072    
1073        <p>Uppercase scheme names are not required to be processed
1074        correctly.</p>
1075    <!-- @@
1076     RFC 3986 3.1.
1077     > Although schemes are case-
1078       insensitive, the canonical form is lowercase and documents that
1079       specify schemes must do so with lowercase letters.
1080    
1081     > An implementation ... should only produce lowercase scheme names for
1082       consistency.
1083    -->
1084      </d:desc>
1085    </d:item>
1086    
1087  </section>  </section>
1088    
1089  <section id="unsupported-messages">  <section id="unsupported-messages">
1090  <h2><i>Unsupported</i> Messages</h2>  <h2><i>Unsupported</i> Messages</h2>
1091    
1092  <d:item name="unsupported:attribute"  <d:item name="element"
1093      class="unsupported">      class="unsupported" level="unsupported">
1094    <d:message xml:lang="en">This attribute is not supported by the    <d:message xml:lang="en">Conformance checking for element
1095    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
1096      might not be conforming</em>.</d:message>
1097    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1098      <p>The conformant checker does not support the attribute.      <p>The conformant checker does not support the element.
1099      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
1100    </d:desc>    </d:desc>
1101  </d:item>  </d:item>
1102    
1103  <d:item name="unsupported:element"  <d:item name="attribute"
1104      class="unsupported">      class="unsupported" level="unsupported">
1105    <d:message xml:lang="en">This element is not supported by the    <d:message xml:lang="en">Conformance checking for attribute
1106    conformance checker; <em>it might or might not be conforming</em>.</d:message>    <code><var>{local-name}</var></code> of element
1107      <code><var>{element-local-name}</var></code> is not supported;
1108      <em>it might or 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 element.      <p>The conformant checker does not support the attribute.
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:link type"  <d:item name="link type"
1116      class="unsupported">      class="unsupported" level="unsupported">
1117    <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
1118    or registered at the time of the release of the conformance checker;    standardized or registered at the time of the release of the conformance
1119    <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
1120      registered</em>.</d:message>
1121    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1122      <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.
1123      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 1129  m:URI::syntax error;must;This IRI is not
1129      The link type might have been added to the registry since then.      The link type might have been added to the registry since then.
1130      In such case it might be conforming.  Otherwise, the      In such case it might be conforming.  Otherwise, the
1131      document is non-conforming.</p>      document is non-conforming.</p>
1132    
1133        <dl>
1134        <dt>Link types <code>shortcut icon</code></dt>
1135            <dd>Link type <code>shortcut</code> is not registered.
1136            Use only <code>icon</code> for linking to so-called favicon.</dd>
1137        </dl>
1138    </d:desc>    </d:desc>
1139  </d:item>  </d:item>
1140    
1141    <d:item name="event handler"
1142        class="unsupported" level="unsupported">
1143      <d:message xml:lang="en">Conformance checking for event handler attribute
1144      is not supported; <em>it might or might not be conforming.</em></d:message>
1145    </d:item>
1146    
1147    <d:item name="language tag"
1148        class="unsupported" level="unsupported">
1149      <d:message xml:lang="en">Conformance checking for language tag
1150      is not supported; <em>it might or might not be conforming.</em></d:message>
1151    </d:item>
1152    
1153    <d:item name="media query"
1154        class="unsupported" level="unsupported">
1155      <d:message xml:lang="en">Conformance checking for media query
1156      is not supported; <em>it might or might not be conforming.</em></d:message>
1157    </d:item>
1158    
1159    <d:item name="script"
1160        class="unsupported" level="unsupported">
1161      <d:message xml:lang="en">Conformance checking for script
1162      language <code><var>$0</var></code> is not supported;
1163      <em>it might or might not be conforming.</em></d:message>
1164    </d:item>
1165    
1166    <d:item name="style"
1167        class="unsupported" level="unsupported">
1168      <d:message xml:lang="en">Conformance checking for style
1169      language <code><var>$0</var></code> is not supported;
1170      <em>it might or might not be conforming.</em></d:message>
1171    </d:item>
1172    
1173  </section>  </section>
1174    
1175    <d:catalog>
1176    manakaiCompatMode:quirks;;Quirks Mode
1177    manakaiCompatMode:limited quirks;;Limited Quirks Mode
1178    manakaiCompatMode:no quirks;;No Quirks Mode
1179    
1180    manakaiIsHTML:1;;HTML Document
1181    manakaiIsHTML:0;;XML Document
1182    </d:catalog>
1183    
1184  <section id="license">  <section id="license">
1185  <h2>License of This Document</h2>  <h2>License of This Document</h2>
1186    
1187  <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>
1188  <p>This library is free software; you can redistribute it  <p>This document is free software; you can redistribute it
1189  and/or modify it under the same terms as Perl itself.</p>  and/or modify it under the same terms as Perl itself.</p>
1190  </section>  </section>
1191    
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