/[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 1.11 by wakaba, Mon Sep 10 11:51:09 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>colgroup</code>, <code>dd</code>,
487        <code>dt</code>, <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>,
490        <code>tbody</code>, <code>td</code>, <code>tfoot</code>,
491        <code>th</code>, <code>thead</code>, <code>tr</code>,
492        <code>ul</code> end tag can be omitted in HTML documents.
493        For any element except for void element, there must be an explicit
494        end tag.</p>
495    
496        <p>Note that misnesting tags, such as
497        <code class="bad example">&lt;a>&lt;b>&lt;/a>&lt;/b></code>, are not
498        allowed and they also cause this error.</p>
499      </d:desc>
500    </d:item>
501    
502    <d:item name="not first start tag"
503        class="parse-error">
504      <d:message xml:lang="en">This <code>&lt;html></code> tag is not
505      the first start tag.</d:message>
506      <d:desc>
507        <p>There is a start tag of the <code>html</code> element
508        that it not the first start tag in the input stream.
509        The document is non-conforming.</p>
510    
511        <p>In an HTML document, there cannot be more than one
512        <code>html</code> element and therefore there cannot be
513        more than one <code>&lt;html></code> tag.  In addition,
514        nothing can be placed before the <code>&lt;html></code> tag
515        except a <code>DOCTYPE</code>, white space characters,
516        and comments.</p>
517      </d:desc>
518    </d:item>
519    
520    <d:item name="not HTML5"
521        class="parse-error">
522      <d:message xml:lang="en">This document is written in an old version of
523      HTML.</d:message>
524      <d:desc xml:lang="en">
525        <p>The document contains a <code>DOCTYPE</code> declaration
526        that is different from HTML5 <code>DOCTYPE</code> (i.e.
527        <code>&lt;!DOCTYPE HTML&gt;</code>).  The document is non-conforming.</p>
528    
529        <p>The document might or might not be conformant to
530        some version of HTML.  However, conformance to any HTML
531        specification other than HTML5 provides for no practical
532        convenience, since Web borwsers will parse any
533        HTML document (roughly) as defined in HTML5.</p>
534      </d:desc>
535    </d:item>
536    
537    <d:item name="unmatched end tag"
538        class="parse-error">
539      <d:message xml:lang="en">Element <code><var>$0</var></code> is not
540      opened.</d:message>
541      <d:desc>
542        <p>An end tag appears though no element with the same name
543        has been opened.  The document is non-conforming.</p>
544    
545        <p>For any end tag in HTML document, there must be a
546        corresponding start tag.</p>
547      </d:desc>
548    </d:item>
549    
550  </section>  </section>
551    
552  <section id="element-content-model-errors">  <section id="element-content-model-errors">
# Line 64  Web Document Conformance Checker (BETA)< Line 557  Web Document Conformance Checker (BETA)<
557    <d:message xml:lang="en">Data character is not allowed in this    <d:message xml:lang="en">Data character is not allowed in this
558    context.</d:message>    context.</d:message>
559    <d:desc xml:lang="en">    <d:desc xml:lang="en">
560      <p>A data character occurs where it is not allowed in this      <p>A data character appears where it is not allowed in this
561      context.  The document is non-conforming.</p>      context.  The document is non-conforming.</p>
562    
563      <p>Possible causes:      <p>Possible causes:
564        <dl>        <ul>
565        <dt>If the erred element is an inline-level element (such        <li><p>A data character cannot be a child
566        as <code>a</code> or <code>span</code>)</dt>        of certain sectioning elements such as <code>body</code>,
567            <dd><p>A data character cannot be a child        <code>section</code>, and <code>blockquote</code>.</p>
568            of certain sectioning elements such as <code>body</code>,  
569            <code>section</code>, and <code>blockquote</code>.</p>        <p>Any inline-level content must be put
570          in e.g. paragraph element such as <code>p</code>.</p></li>
571            <p>Any inline-level content must be put        <li><p>Though some elements such as <code>div</code>,
572            in e.g. paragraph element such as <code>p</code>.</p></dd>        <code>li</code>, and <code>td</code> allow
573        <dt>If the erred element is a block-level element (such as        <em>either one</em> of block-level or inline-level content
574        <code>div</code> or <code>h<var>n</var></code>)</dt>        is allowed.  If there is a block-level content,
575            <dd><p>Though some elements such as <code>div</code>,        any inline-level content must be put
576            <code>li</code>, and <code>td</code> allow        in e.g. paragraph element such as <code>p</code>.</p></li>
577            <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>  
578      </p>      </p>
579    </d:desc>    </d:desc>
580  </d:item>  </d:item>
# Line 97  Web Document Conformance Checker (BETA)< Line 586  Web Document Conformance Checker (BETA)<
586    <d:desc xml:lang="en">    <d:desc xml:lang="en">
587      <p>The content model of the element is so defined that it      <p>The content model of the element is so defined that it
588      must contain a <code><var>$0</var></code> child element.      must contain a <code><var>$0</var></code> child element.
589      Without such an element, the document is non-conforming.</p>      The document is non-conforming.</p>
590    
591      <p>For example:      <p>For example:
592        <ul>        <ul>
# Line 117  Web Document Conformance Checker (BETA)< Line 606  Web Document Conformance Checker (BETA)<
606    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>
607    <d:desc xml:lang="en">    <d:desc xml:lang="en">
608      <p>The <code>tr</code> element must contain at least one      <p>The <code>tr</code> element must contain at least one
609      <code>td</code> or <code>th</code> child element.  Without      <code>td</code> or <code>th</code> child element.  The document
610      such an element, the document is non-conforming.</p>      is non-conforming.</p>
611    </d:desc>    </d:desc>
612  </d:item>  </d:item>
613    
# Line 127  Web Document Conformance Checker (BETA)< Line 616  Web Document Conformance Checker (BETA)<
616    <d:message xml:lang="en">This element is not allowed in this    <d:message xml:lang="en">This element is not allowed in this
617    context.</d:message>    context.</d:message>
618    <d:desc xml:lang="en">    <d:desc xml:lang="en">
619      <p>An element occurs where it is not allowed.  The document      <p>An element appears where it is not allowed.  The document
620      is non-conforming.</p>      is non-conforming.</p>
621    
622      <p>Possible causes:      <p>Possible causes:
623        <dl>        <dl class="switch">
624        <dt>If the erred element is an inline-level element (such        <dt>If the element with the error is an inline-level element,
625        as <code>a</code> or <code>span</code>)</dt>        such as <code>a</code>, <code>progress</code>, or <code>img</code></dt>
626            <dd><p>An inline-level element cannot be a child            <dd><p>An inline-level element cannot be a child
627            of certain sectioning elements such as <code>body</code>,            of certain sectioning elements such as <code>body</code>,
628            <code>section</code>, and <code>blockquote</code>.</p>            <code>section</code>, and <code>blockquote</code>.</p>
629    
630            <p>Any inline-level content must be put            <p>Any inline-level content must be put
631            in e.g. paragraph element such as <code>p</code>.</p></dd>            in e.g. paragraph element such as <code>p</code>.</p></dd>
632        <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>,
633        <code>div</code> or <code>h<var>n</var></code>)</dt>        <code>div</code>, <code>h<var>n</var></code>,
634            <dd><p>Though some elements such as <code>div</code>,        <code>p</code>, or <code>section</code></dt>
635            <code>li</code>, and <code>td</code> allow            <dd><dl class="switch">
636            <em>either one</em> of block-level or inline-level content                <dt>If the parent element is <code>div</code>,
637            is allowed.  If there is a block-level content,                <code>li</code>, <code>td</code>, or <code>th</code></dt>
638            any inline-level content must be put                <!-- @@ TODO: more... -->
639            in e.g. paragraph element such as <code>p</code>.</p></dd>                    <!-- @@ TODO: <p><ul><li><p> -->
640        <dt>If the erred element is the root <code>html</code> element</dt>                    <dd><p>The parent element allows <em>either</em>
641                      block-level or inline-level content.  If there is a
642                      block-level content, any inline-level content must be
643                      put in e.g. paragraph element such as <code>p</code>.</p>
644                      <p>For example, an HTML document fragment
645                      <code class="bad example">&lt;div>&lt;p>Hello!&lt;/p> World!&lt;/div></code>
646                      is non-conforming, since a word <q>World!</q> does not belong
647                      to any paragraph.  (If not part of any paragraph, what is
648                      it!?)  A conforming example would be:
649                        <pre class="example"><code>&lt;div>&lt;p>Hello!&lt;/p> &lt;p>World!&lt;/p>&lt;/div></code></pre>
650                      </p></dd>
651                  <dt>If the parent element does <em>not</em> allow
652                  block-level elements as content</dt>
653                      <dd>The element is not allowed to be inserted here.
654                      For example, a <code>div</code> element cannot be
655                      a child of an <code>h1</code> element.</dd>
656              </dl></dd>
657          <dt>If the element with the error is a <code>noscript</code> element</dt>
658              <dd>The <code>noscript</code> element is allowed only in the context
659              where a block-level or inline-level content is expected
660              and in the <code>head</code> element.
661              It cannot be used in e.g. <code>ul</code>, <code>table</code>,
662              or <code>select</code>.</dd>
663          <dt>If the element with the error is the <code>html</code> element
664          that is the root element of an XHTML document</dt>
665            <dd><p>In an XHTML document, the root <code>html</code>            <dd><p>In an XHTML document, the root <code>html</code>
666            element must have an <code>xmlns</code> attribute            element must have an <code>xmlns</code> attribute
667            whose value is set to            whose value is set to
668            <code>http://www.w3.org/1999/xhtml</code>.</p></dd>            <code>http://www.w3.org/1999/xhtml</code>.</p></dd>
669          <dt>If the element with the error is <code>blink</code>,
670          <code>center</code>, or <code>marquee</code> element</dt>
671              <dd>These elements are not part of the HTML standard.
672              Use CSS for styling control.</dd>
673    
674          <dt><code>button</code>, <code>datalist</code>,
675          <code>fieldset</code>, <code>form</code>,
676          <code>input</code>, <code>label</code>,
677          <code>optgroup</code>, <code>option</code>, <code>output</code>,
678          <code>rb</code>, <code>rp</code>, <code>rt</code>, <code>ruby</code>,
679          <code>textarea</code>, or <code>textarea</code> element</dt>
680          <!-- rbc, rtc ? -->
681              <dd>These elements are intentionally not supported by the conformance
682              checker <em>yet</em>.</dd>
683        </dl>        </dl>
684      </p>      </p>
685    </d:desc>    </d:desc>
686  </d:item>  </d:item>
687    
688  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"
689  no DOCTYPE;parse-error;This document does not start with the <code>DOCTYPE</code> declaration.      class="content-model-error">
690  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>
691  not closed;parse-error;Element <code>$0</code> is not closed.    element before this element.</d:message>
692  unmatched end tag;parse-error;Element <code>$0</code> is not opened.    <d:desc xml:lang="en">
693        <p>There must be an element before another element, but there
694  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>
695    
696  s:IMT:obsolete subtype;should;An <em>obsolete</em> subtype is used.      <p>For example, there must be a <code>dt</code> element
697  s:IMT:private subtype;should;A private (<code>x-</code> or <code>x.</code>) subtype is used.      before any <code>dd</code> element.</p>
698  s:IMT:unregistered subtype;should;The subtype is not registered to IANA.    </d:desc>
699    </d:item>
700    
701    </section>
702    
703    <section id="attribute-errors">
704    <h2>Attribute Errors</h2>
705    
706    <d:item name="attribute missing"
707        class="attribute-error">
708      <d:message xml:lang="en">Required attribute <code><var>$0</var></code>
709      is not specified.</d:message>
710      <d:desc>
711        <p>A required attribute is not specified.  The document
712        is non-conforming.</p>
713    
714        <p>Some attribute is defined as <i>required</i>.
715        Without required attributes specified, user agents
716        cannot provide full functionality of the element to the user.</p>
717    
718        <dl class="switch">
719        <dt>HTML <code>img</code> element</dt>
720            <dd>The <code>src</code> attribute must be specified.
721            Additionally, the <code>alt</code> attribute must be specified
722            in many cases.</dd>
723        <dt>HTML <code>link</code> element</dt>
724            <dd>The <code>rel</code> attribute must be specified.
725            Note that the <code>rev</code> attribute is obsolete.</dd>
726        </dl>
727      </d:desc>
728    </d:item>
729    
730    <d:item name="attribute not allowed" class="attribute-error">
731      <d:message xml:lang="en">Attribute
732      <code><var>{local-name}</var></code> is not allowed for
733      <code><var>{element-local-name}</var></code> element.</d:message>
734      <d:desc xml:lang="en">
735        <p>An attribute is specified where it is not allowed.
736        The document is non-conforming.</p>
737    
738        <dl>
739        <dt>HTML <code>meta</code> element</dt>
740            <dd>For HTML <code>meta</code> element, <em>only one</em> of
741            <code>name</code>, <code>http-equiv</code>, or <code>charset</code>
742            attribute is allowed.</dd>
743        </dl>
744      </d:desc>
745    </d:item>
746    
747    <d:item name="in HTML:xml:lang"
748        class="attribute-error">
749      <d:message xml:lang="en">The <code>xml:lang</code> attribute is not
750      allowed in HTML document.</d:message>
751      <d:desc xml:lang="en">
752        <p>The <code>xml:lang</code> attribute is not allowed in
753        HTML document.  The document is non-conforming.</p>
754    
755        <p>Use of the <code>xml:lang</code> attribute is conforming
756        <em>only</em> in XML documents.</p>
757    
758        <p>To specify natural language information in HTML document,
759        use <code>lang</code> attribute instead.</p>
760    
761        <p>XHTML 1.0 Appendix C was encouraged to specify both
762        <code>lang</code> and <code>xml:lang</code> attributes with
763        the same value.  Such a duplication has <em>no effect</em> in practice.
764        Use only one of <code>lang</code> (in HTML) or <code>xml:lang</code> (in
765        XML).</p>
766    
767        <!-- @@ ISSUE: xml:lang in non-HTML element in DOM5 HTML created
768             from an HTML document? -->
769      </d:desc>
770    </d:item>
771    
772    <d:item name="in XML:charset"
773        class="attribute-error">
774      <d:message xml:lang="en">The <code>charset</code> attribute is not
775      allowed in XML document.</d:message>
776      <d:desc>
777        <p>The <code>charset</code> attribute of a
778        <code>meta</code> element is not allowed in XML document.
779        The document is non-conforming.</p>
780    
781        <p>To specify the character encoding used for serialization,
782        if necessary, use XML declaration instead:
783          <pre class="xml example"><code>&lt;?xml version="1.0" encoding="<var>encoding-name</var>"?></code></pre>
784        </p>
785      </d:desc>
786    </d:item>
787    
788    <d:item name="in XML:lang"
789        class="attribute-error">
790      <d:message xml:lang="en">The <code>lang</code> attribute is not
791      allowed in XML document.</d:message>
792      <d:desc>
793        <p>The HTML <code>lang</code> attribute is not allowed in
794        XML document.  The document is non-conforming.</p>
795    
796        <p>The <code>lang</code> attribute in <code>null</code>
797        namespace for HTML elements is conforming <em>only</em> in
798        HTML documents.</p>
799    
800  s:URI::empty path;should;This IRI should explicitly end with <code>/</code>.      <p>To specify natural language information in XML document,
801  m:URI::syntax error;must;This IRI is not syntactically valid.      use <code>xml:lang</code> attribute instead.</p>
802      </d:desc>
803    </d:item>
804    
805    <d:item name="in XML:xmlns"
806        class="attribute-error">
807      <d:message xml:lang="en">The <code>xmlns</code> attribute
808      in the <code>null</code> namespace is not allowed in
809      XHTML document.  The document is non-conforming.</d:message>
810      <d:desc>
811        <p>The <code>xmlns</code> attribute in the <code>null</code>
812        namespace is not allowed in XHTML document.</p>
813    
814        <p>This error should not occur in conformance-checking of
815        static documents.</p>
816      </d:desc>
817    </d:item>
818    
819    </section>
820    
821    <section id="attribute-value-errors">
822    <h2>Attribute Value Errors</h2>
823    
824    <d:item name="enumerated:invalid"
825        class="attribute-value-error">
826      <d:message xml:lang="en">This attribute only allow a limited set of
827      values and the specified value <code><var>{@}</var></code> is not one
828      of them.</d:message>
829      <d:desc xml:lang="en">
830        <p>For this attribute only several values are allowed and the
831        value of the attribute is not one of them.  The document
832        is non-conforming.</p>
833    
834        <dl>
835        <dt>HTML <code>meta</code> element, <code>http-equiv</code> attribute</dt>
836            <dd><p>Only <code>Default-Style</code> and <code>Refresh</code>
837            is allowed.</p>
838            <p>Value <code>Content-Type</code> is obsolete; for charset
839            declaration, the <code>charset</code> attribute can be used as:
840            <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
841            ... where <var>charset-name</var> is a name of the character encoding
842            of the document, such as <code>utf-8</code>.</p>
843            <p>Values <code>Content-Style-Type</code> and
844            <code>Content-Script-Type</code> are currently not allowed.</p>
845            <p>Value <code>Keywords</code> is not allowed.  Use
846            <code>name</code> attribute instead of <code>http-equiv</code>
847            attribute.</p>
848            <p>Values <code>Expires</code>, <code>Pragma</code>,
849            and <code>Cache-Control</code> are not allowed;
850            use <em>real</em> HTTP header fields for cache control.</p></dd>
851        </dl>
852      </d:desc>
853    </d:item>
854    
855    <d:item name="duplicate ID"
856        class="attribute-value-error">
857      <d:message xml:lang="en">This identifier has already been
858      assigned to another element.</d:message>
859      <!-- @@ <id=a xml:id=a>? -->
860    </d:item>
861    
862    <d:item name="link type:bad context"
863        class="attribute-value-error">
864      <d:message xml:lang="en">The link type <code><var>$0</var></code>
865      cannot be specified for this element.</d:message>
866      <d:desc xml:lang="en">
867        <p>The specified link type cannot be used for the element.
868        The document is non-conforming.</p>
869    
870        <p>Link types are associated with limited set of elements.
871        They cannot be used with other elements.</p>
872    
873        <p>For example, link type <code>bookmark</code>
874        can be used with <code>a</code> or <code>area</code> element,
875        while it cannot be used with <code>link</code> element.</p>
876      </d:desc>
877    </d:item>
878    
879    <d:item name="link type:non-conforming"
880        class="attribute-value-error">
881      <d:message xml:lang="en">The link type <code><var>$0</var></code>
882      is non-conforming.</d:message>
883      <d:desc xml:lang="en">
884        <p>The specified link type is non-conforming, and therefore
885        the document is non-conforming.</p>
886    
887        <dl>
888        <dt>Link type <code>contents</code></dt>
889          <dd>Use link type <code>index</code>.</dd>
890        <dt>Link type <code>copyright</code></dt>
891          <dd>Use link type <code>license</code>.</dd>
892        <dt>Link type <code>home</code></dt>
893          <dd>Use link type <code>index</code>.</dd>
894        <dt>Link type <code>start</code></dt>
895          <dd>Use link type <code>first</code>.</dd>
896        <dt>Link type <code>toc</code></dt>
897          <dd>Use link type <code>index</code>.</dd>
898        </dl>
899      </d:desc>
900    </d:item>
901    
902    <d:item name="reserved browsing context name"
903        class="attribute-value-error">
904      <d:message xml:lang="en">Browsing context name
905      <code><var>{@}</var></code> is reserved.</d:message>
906      <d:desc xml:lang="en">
907        <p>The specified browsing context name is reserved.
908        The document is non-conforming.</p>
909    
910        <p>Names of browsing contexts starting with <code>_</code>
911        (<code>U+005F</code> <code class="charname">LOW LINE</code>)
912        are reserved so that it must not be used.</p>
913    
914        <p>Old version of HTML, non-HTML markup languages, and
915        Web browsers define or implements special reserved
916        browsing context names <code>_blank</code>,
917        <code>_main</code>, and <code>_replace</code>.
918        However, they are <em>not</em> conforming attribute values.</p>
919      </d:desc>
920    </d:item>
921    
922    </section>
923    
924    <section id="attribute-value-warnings">
925    <h2>Attribute Value Warnings</h2>
926    
927    <d:item name="link type:proposed" level="s"
928        class="attribute-value-warning should">
929      <d:message xml:lang="en">Link type <code><var>$0</var></code>
930      is proposed but not accepted yet; it <em>should not</em> be
931      used until it has been accepted.</d:message>
932      <d:desc>
933        <p>The link type is in the <i>proposed</i> status; it
934        <em>should not</em> be used until it has been
935        accepted.</p>
936    
937        <p><strong>Warning</strong>: The data served to the
938        conforming checker might be out of date; it might have already
939        been accepted or rejected, depending on which the document
940        might be conforming or non-conforming.  See WHATWG Wiki
941        for the latest information.</p>
942      </d:desc>
943    </d:item>
944    
945    </section>
946    
947    <section id="table-model-errors">
948    <h2>Table Model Errors</h2>
949    
950    <d:item name="table:colspan creates column with no anchored cell"
951        class="table-model-error">
952      <d:message xml:lang="en">This <code>colspan</code> attribute
953      results in creating a table column that does not contain
954      any cell anchored to it.</d:message>
955    </d:item>
956    
957    <d:item name="table:no cell in last row"
958        class="table-model-error">
959      <d:message xml:lang="en">The table has no cell (<code>td</code> or
960      <code>th</code>) in the last row.</d:message>
961    </d:item>
962    
963    <d:item name="table:rowspan extends table"
964        class="table-model-error">
965      <d:message xml:lang="en">This <code>rowspan</code> attribute
966      results in creating a table row that does not contain
967      any cell anchored to it.</d:message>
968      <d:desc xml:lang="en">
969        <p>The <code>rowspan</code> attribute value of the cell
970        is so specified that it extends a table in the row axis.
971        However, the extended row does not contain any cell by itself.
972        The document is non-conforming.</p>
973    
974        <p>For example, the table below is non-conforming:
975          <pre class="html non-conforming example"><code>&lt;table>
976    &lt;tbody>
977    &lt;tr>&lt;td rowspan=2>&lt;/td>&lt;/tr>
978    &lt;/tbody>
979    &lt;/table></code></pre>
980        ... since the second row contains only
981        a cell that spans between first and second rows.</p>
982      </d:desc>
983    </d:item>
984    
985    </section>
986    
987    <section id="imt-warnings">
988    <h2>Internet Media Type Warnings</h2>
989    
990    <d:item name="IMT:obsolete subtype"
991        class="should" level="s">
992      <d:message xml:lang="en"><code><var>{@}</var></code>: An <em>obsolete</em>
993      subtype is used.</d:message>
994    </d:item>
995    
996    <d:item name="IMT:private subtype"
997        class="should" level="s">
998      <d:message xml:lang="en"><code><var>{@}</var></code>: A private
999      (<code>x-</code> or <code>x.</code>) subtype is used.</d:message>
1000    </d:item>
1001    
1002    <d:item name="IMT:unregistered subtype"
1003        class="should" level="s">
1004      <d:message xml:lang="en"><code><var>{@}</var></code>: The subtype is
1005      not registered to IANA.</d:message>
1006    <!-- TODO: Unknown message?? -->
1007    </d:item>
1008    
1009    </section>
1010    
1011    <section id="uri-errors">
1012    <h2>URI (or IRI) Errors</h2>
1013    
1014    <d:item name="URI::syntax error"
1015        class="must" level="m">
1016      <d:message xml:lang="en">The specified value is syntactically not an IRI
1017      reference.</d:message>
1018      <d:desc xml:lang="en">
1019        <p>The specified value does not satisfy the syntactical requirements
1020        for IRI references.  The document is non-conforming.</p>
1021    
1022        <p>Possible causes:
1023          <ul>
1024          <li>The string might contain one or more white space characters.
1025          Especially, the <code> </code> (<code>U+0020</code>
1026          <code class="charname">SPACE</code>) character cannot be
1027          used in IRI references.</li>
1028          </ul>
1029        </p>
1030      </d:desc>
1031    </d:item>
1032    
1033    </section>
1034    
1035    <section id="uri-shoulds">
1036    <h2>URI (or IRI) Should-level Errors</h2>
1037    
1038    <d:item name="URI::dot-segment"
1039        class="should" level="s">
1040      <d:message xml:lang="en">A dot-segment (<code>.</code> or
1041      <code>..</code>) occurs in an absolute reference.</d:message>
1042      <d:desc>
1043        <p>Dot-segment (<code>.</code> or <code>..</code>) should
1044        not occur in an absolute reference.</p>
1045    
1046        <p>In relative references, dot-segments are used to represent
1047        the current (<code>.</code>) or the parent (<code>..</code>)
1048        hierarchy of the path.  Though they are also allowed
1049        in absolute references, it should be resolved to the
1050        canonical form before it has been published.</p>
1051      </d:desc>
1052    </d:item>
1053    
1054    <d:item name="URI::empty path"
1055        class="should" level="s">
1056      <d:message xml:lang="en">This IRI does not end with
1057      a <code>/</code>.</d:message>
1058    </d:item>
1059    
1060    <d:item name="URI::lowercase hexadecimal digit"
1061        class="should" level="s">
1062      <d:message xml:lang="en">A lowercase hexadecimal digit is used
1063      in percent-encoding.</d:message>
1064      <d:desc xml:lang="en">
1065        <p>The hexadecimal digit in percent-encoding string in the IRI
1066        is in lowercase.  Though the IRI <em>is</em> conforming,
1067        it should be in uppercase.</p>
1068      </d:desc>
1069    </d:item>
1070    
1071    <d:item name="URI::percent-encoded unreserved"
1072        class="should" level="s">
1073      <d:message xml:lang="en">An unreserved character is
1074      percent-encoded.</d:message>
1075      <d:desc xml:lang="en">
1076        <p>An unreserved character is percent-encoded in the IRI.
1077        Though it <em>is</em> conforming, it should be in the
1078        decoded (or bare) form.</p>
1079      </d:desc>
1080    </d:item>
1081    
1082    <d:item name="URI::uppercase scheme name"
1083        class="should" level="s">
1084      <d:message xml:lang="en">URI scheme name is in uppercase.</d:message>
1085      <d:desc xml:lang="en">
1086        <p>The scheme part of the IRI is written in uppercase letter.</p>
1087    
1088        <p>Uppercase scheme names are not required to be processed
1089        correctly.</p>
1090    <!-- @@
1091     RFC 3986 3.1.
1092     > Although schemes are case-
1093       insensitive, the canonical form is lowercase and documents that
1094       specify schemes must do so with lowercase letters.
1095    
1096     > An implementation ... should only produce lowercase scheme names for
1097       consistency.
1098    -->
1099      </d:desc>
1100    </d:item>
1101    
1102  </section>  </section>
1103    
1104  <section id="unsupported-messages">  <section id="unsupported-messages">
1105  <h2><i>Unsupported</i> Messages</h2>  <h2><i>Unsupported</i> Messages</h2>
1106    
1107  <d:item name="unsupported:attribute"  <d:item name="element"
1108      class="unsupported">      class="unsupported" level="unsupported">
1109    <d:message xml:lang="en">This attribute is not supported by the    <d:message xml:lang="en">Conformance checking for element
1110    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
1111      might not be conforming</em>.</d:message>
1112    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1113      <p>The conformant checker does not support the attribute.      <p>The conformant checker does not support the element.
1114      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
1115    </d:desc>    </d:desc>
1116  </d:item>  </d:item>
1117    
1118  <d:item name="unsupported:element"  <d:item name="attribute"
1119      class="unsupported">      class="unsupported" level="unsupported">
1120    <d:message xml:lang="en">This element is not supported by the    <d:message xml:lang="en">Conformance checking for attribute
1121    conformance checker; <em>it might or might not be conforming</em>.</d:message>    <code><var>{local-name}</var></code> of element
1122      <code><var>{element-local-name}</var></code> is not supported;
1123      <em>it might or might not be conforming</em>.</d:message>
1124    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1125      <p>The conformant checker does not support the element.      <p>The conformant checker does not support the attribute.
1126      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
1127    </d:desc>    </d:desc>
1128  </d:item>  </d:item>
1129    
1130  <d:item name="unsupported:link type"  <d:item name="link type"
1131      class="unsupported">      class="unsupported" level="unsupported">
1132    <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
1133    or registered at the time of the release of the conformance checker;    standardized or registered at the time of the release of the conformance
1134    <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
1135      registered</em>.</d:message>
1136    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1137      <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.
1138      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 1144  m:URI::syntax error;must;This IRI is not
1144      The link type might have been added to the registry since then.      The link type might have been added to the registry since then.
1145      In such case it might be conforming.  Otherwise, the      In such case it might be conforming.  Otherwise, the
1146      document is non-conforming.</p>      document is non-conforming.</p>
1147    
1148        <dl>
1149        <dt>Link types <code>shortcut icon</code></dt>
1150            <dd>Link type <code>shortcut</code> is not registered.
1151            Use only <code>icon</code> for linking to so-called favicon.</dd>
1152        </dl>
1153    </d:desc>    </d:desc>
1154  </d:item>  </d:item>
1155    
1156    <d:item name="event handler"
1157        class="unsupported" level="unsupported">
1158      <d:message xml:lang="en">Conformance checking for event handler attribute
1159      is not supported; <em>it might or might not be conforming.</em></d:message>
1160    </d:item>
1161    
1162    <d:item name="language tag"
1163        class="unsupported" level="unsupported">
1164      <d:message xml:lang="en">Conformance checking for language tag
1165      is not supported; <em>it might or might not be conforming.</em></d:message>
1166    </d:item>
1167    
1168    <d:item name="media query"
1169        class="unsupported" level="unsupported">
1170      <d:message xml:lang="en">Conformance checking for media query
1171      is not supported; <em>it might or might not be conforming.</em></d:message>
1172    </d:item>
1173    
1174    <d:item name="script"
1175        class="unsupported" level="unsupported">
1176      <d:message xml:lang="en">Conformance checking for script
1177      language <code><var>$0</var></code> is not supported;
1178      <em>it might or might not be conforming.</em></d:message>
1179    </d:item>
1180    
1181    <d:item name="style"
1182        class="unsupported" level="unsupported">
1183      <d:message xml:lang="en">Conformance checking for style
1184      language <code><var>$0</var></code> is not supported;
1185      <em>it might or might not be conforming.</em></d:message>
1186    </d:item>
1187    
1188  </section>  </section>
1189    
1190    <d:catalog>
1191    manakaiCompatMode:quirks;;Quirks Mode
1192    manakaiCompatMode:limited quirks;;Limited Quirks Mode
1193    manakaiCompatMode:no quirks;;No Quirks Mode
1194    
1195    manakaiIsHTML:1;;HTML Document
1196    manakaiIsHTML:0;;XML Document
1197    </d:catalog>
1198    
1199  <section id="license">  <section id="license">
1200  <h2>License of This Document</h2>  <h2>License of This Document</h2>
1201    
1202  <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>
1203  <p>This library is free software; you can redistribute it  <p>This document is free software; you can redistribute it
1204  and/or modify it under the same terms as Perl itself.</p>  and/or modify it under the same terms as Perl itself.</p>
1205  </section>  </section>
1206    
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