/[pub]/test/html-webhacc/error-description-source.xml
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Diff of /test/html-webhacc/error-description-source.xml

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revision 1.5 by wakaba, Tue Jul 17 13:52:54 2007 UTC revision 1.14 by wakaba, Wed Nov 7 11:29:46 2007 UTC
# Line 28  Web Document Conformance Checker (BETA)< Line 28  Web Document Conformance Checker (BETA)<
28    </d:desc>    </d:desc>
29  </d:item>  </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"  <d:item name="bare ero"
47      class="tokenize-error">      class="tokenize-error">
48    <d:message xml:lang="en">The <code>&amp;</code> character must    <d:message xml:lang="en">The <code>&amp;</code> character must
# Line 38  Web Document Conformance Checker (BETA)< Line 53  Web Document Conformance Checker (BETA)<
53      is not part of any reference appears in the input stream.      is not part of any reference appears in the input stream.
54      The document is non-conforming.</p>      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      <p>The <code>&amp;</code> character must
60      be the first character of a reference:      be the first character of a reference:
61        <dl>        <dl>
# Line 63  Web Document Conformance Checker (BETA)< Line 81  Web Document Conformance Checker (BETA)<
81    </d:desc>    </d:desc>
82  </d:item>  </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"  <d:item name="bare stago"
108      class="tokenize-error">      class="tokenize-error">
109    <d:message xml:lang="en">A <code>&lt;</code> character is not followed    <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>    by tag name or by a <code>!</code> character.</d:message>
111    <d:desc xml:lang="en">    <d:desc xml:lang="en">
112      <p>A <code>&lt;</code> (<code>U+003C</code> <code class="charname">LESS-THAN      <p>A <code>&lt;</code> (<code>U+003C</code>
113      SIGN</code>) character which is not part of any markup appears      <code class="charname">LESS-THAN SIGN</code>) character which is not part
114      in the input stream.</p>      of any markup appears in the input stream.</p>
115    
116      <p>The <code>&lt;</code> character as a data character must      <p>The <code>&lt;</code> character as a data character must
117      be escaped as:      be escaped as:
118      <pre class="html example"><code>&lt;lt;</code></pre>      <pre class="html example"><code>&amp;lt;</code></pre>
119      </p>      </p>
120    </d:desc>    </d:desc>
121  </d:item>  </d:item>
# Line 92  Web Document Conformance Checker (BETA)< Line 133  Web Document Conformance Checker (BETA)<
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      <p>The string <code>&amp;#</code> must be the first two characters
     <code>NUMBER SIGN</code>) character must be the first two characters  
136      of a reference:      of a reference:
137        <dl>        <dl>
138        <dt>Numeric character reference</dt>        <dt>Numeric character reference</dt>
# Line 107  Web Document Conformance Checker (BETA)< Line 147  Web Document Conformance Checker (BETA)<
147      </p>      </p>
148    
149      <p>To represent <code>&amp;#</code> as data characters, use      <p>To represent <code>&amp;#</code> as data characters, use
150      named entity reference:      a named entity reference for the <code>&amp;</code> character:
151        <pre class="html example"><code>&amp;amp;#</code></pre>        <pre class="html example"><code>&amp;amp;#</code></pre>
152      </p>      </p>
153    </d:desc>    </d:desc>
# Line 129  Web Document Conformance Checker (BETA)< Line 169  Web Document Conformance Checker (BETA)<
169      of the code point of the character to be referenced.</p>      of the code point of the character to be referenced.</p>
170    
171      <p>To represent <code>&amp;#x</code> as data characters, use      <p>To represent <code>&amp;#x</code> as data characters, use
172      named entity reference:      a named entity reference for the <code>&amp;</code> character:
173        <pre class="html example"><code>&amp;amp;#x</code></pre>        <pre class="html example"><code>&amp;amp;#x</code></pre>
174      </p>      </p>
175    </d:desc>    </d:desc>
176  </d:item>  </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"  <d:item name="dash in comment"
233      class="tokenize-error">      class="tokenize-error">
234    <d:message xml:lang="en">There is a <code>--</code> sequence    <d:message xml:lang="en">There is a <code>--</code> sequence
# Line 154  Web Document Conformance Checker (BETA)< Line 248  Web Document Conformance Checker (BETA)<
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>There are more than one attributes with the same      <p>There are more than one attributes with the same
255      name in a tag.  The document is non-conforming.</p>      name in a tag.  The document is non-conforming.</p>
# Line 166  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>Void element syntax (<code>/></code>) must not be used      <p>Polytheistic slash (<code>/></code>) must not be used
268      for the element.  The document is non-conforming.</p>      for the element.  The document is non-conforming.</p>
269    
270      <p>The void element syntax can only be      <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.</p>      <code>col</code>, and <code>input</code> elements.</p>
275    
276      <p>Note that, unlike in XML, the void element syntax has      <dl class="switch">
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;nest/></code>, or <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>
# Line 187  Web Document Conformance Checker (BETA)< Line 306  Web Document Conformance Checker (BETA)<
306  <d:item name="pio"  <d:item name="pio"
307      class="tokenize-error">      class="tokenize-error">
308    <d:message xml:lang="en">Processing instruction    <d:message xml:lang="en">Processing instruction
309    (<code>&lt;?<var>...</var>?></code>) cannot be used.</d:message>    (<code>&lt;?<var>...</var>></code>) cannot be used.</d:message>
310    <d:desc xml:lang="en">    <d:desc xml:lang="en">
311      <p>Processing instructions (<code>&lt;?<var>...</var>?></code>),      <p>Processing instructions (<code>&lt;?<var>...</var>?></code>),
312      including XML declaration (<code>&lt;?xml <var>...</var>?></code>)      including XML declaration (<code>&lt;?xml <var>...</var>?></code>)
313      and XML style sheet <abbr title="processing instruction">PI</abbr>      and XML style sheet <abbr title="processing instruction">PI</abbr>
314      (<code>&lt;xml-stylesheet <var>...</var>?></code>), are not allowed      (<code>&lt;?xml-stylesheet <var>...</var>?></code>), are not allowed
315      in the HTML syntax.  The document is non-conforming.</p>      in the HTML syntax.  The document is non-conforming.</p>
316    
317      <p>If it is necessary to embed a processing instruction      <dl class="switch">
318      in the HTML document, you must use the XML syntax instead.</p>      <dt><code>&lt;?xbl?></code> (<abbr>XBL</abbr> Association)</dt>
319          <dd>An <abbr>XBL</abbr> binding cannot be associated by
320      <p>In the HTML syntax, XML declaration is not necessary.</p>        <abbr title="processing instruction">PI</abbr> in <abbr>HTML</abbr>
321          document.  Use <code>binding</code> property in <abbr>CSS</abbr>
322      <p>Instead of XML style sheet,        style sheet.</dd>
323      <abbr title="processing instruction">PI</abbr>s, you must      <dt><code>&lt;?xml?&gt;</code> (XML declaration)</dt>
324      use the HTML <code>link</code> element whose <code>rel</code>          <dd>XML declaration is unnecessary for HTML documents.</dd>
325      attribute is set to <code>stylesheet</code> (or <code>alternate      <dt><code>&lt;?xml-stylesheet?></code> (XML style sheet
326      stylesheet</code> for an aleternate style sheet).</p>      <abbr title="processing instruction">PI</abbr>)</dt>
327            <dd>Use HTML <code>link</code> element with <code>rel</code>
328            attribute set to <code>stylesheet</code> (or,
329            <code>alternate stylesheet</code> for an alternate style
330            sheet).</dd>
331        <dt><code>&lt;?php?&gt;</code> or
332        <code>&lt;? <var>... <abbr>PHP</abbr> code ...</var> ?&gt;</code>
333        (<abbr>PHP</abbr> code)</dt>
334            <dd>The conformance checker does <em>not</em> support
335            checking for PHP source documents.</dd>
336        <dt>Other processing instructions</dt>
337            <dd>Processing instructions cannot be inserted in an HTML
338            document.  Use XML document or insert
339            <code>ProcessingInstruction</code> node by scripting.</dd>
340        </dl>
341    
342      <p>Web browsers will parse processing instructions as bogus      <p>Web browsers will parse processing instructions as bogus
343      comments.  Some legacy Web browsers, such as IE:mac and      comments.  Some legacy Web browsers, such as IE:mac and
344      some mobile browsers, will display processing instructions      some mobile Web browsers, will display processing instructions
345      as string.</p>      as string.</p>
346    </d:desc>    </d:desc>
347  </d:item>  </d:item>
# Line 258  Web Document Conformance Checker (BETA)< Line 391  Web Document Conformance Checker (BETA)<
391  <d:item name="in body"  <d:item name="in body"
392      class="parse-error">      class="parse-error">
393    <d:message xml:lang="en">Tag <code>&lt;<var>$0</var>&gt;</code>    <d:message xml:lang="en">Tag <code>&lt;<var>$0</var>&gt;</code>
394    is not allowed in a <code>body</code> element.</d:message>    is not allowed in the <code>body</code> element.</d:message>
395    <d:desc xml:lang="en">    <d:desc xml:lang="en">
396      <p>The start or end tag of an element, which      <p>The start or end tag of an element, which
397      cannot be a descendant of <code>body</code> element, appears      cannot be a descendant of <code>body</code> element, appears
# Line 269  Web Document Conformance Checker (BETA)< Line 402  Web Document Conformance Checker (BETA)<
402    
403  <d:item name="in head:head"  <d:item name="in head:head"
404      class="parse-error">      class="parse-error">
405    <d:message xml:lang="en">Start tag <code>&lt;<var>head</var>&gt;</code>    <d:message xml:lang="en">Start tag <code>&lt;head&gt;</code>
406    is not allowed in the <code>head</code> element.</d:message>    is not allowed in the <code>head</code> element.</d:message>
407    <d:desc xml:lang="en">    <d:desc xml:lang="en">
408      <p>There is a start tag <code>&lt;head></code> in the      <p>There is a start tag <code>&lt;head></code> in the
# Line 333  Web Document Conformance Checker (BETA)< Line 466  Web Document Conformance Checker (BETA)<
466    
467  <d:item name="no DOCTYPE"  <d:item name="no DOCTYPE"
468      class="parse-error">      class="parse-error">
469    <d:message xml:lang="en">This document does not start with the    <d:message xml:lang="en">This document does not start with a
470    <code>DOCTYPE</code>.</d:message>    <code>DOCTYPE</code>.</d:message>
471    <d:desc>    <d:desc>
472      <p>The document does not start with a <code>DOCTYPE</code>.      <p>The document does not start with a <code>DOCTYPE</code>.
# Line 344  Web Document Conformance Checker (BETA)< Line 477  Web Document Conformance Checker (BETA)<
477      </p>      </p>
478    
479      <p>Only white space characters and comments are allowed      <p>Only white space characters and comments are allowed
480      before the <code>DOCTYPE</code>.</p>      before the <code>DOCTYPE</code>.  XML declaration is <em>not</em>
481        allowed in HTML document.</p>
482    </d:desc>    </d:desc>
483  </d:item>  </d:item>
484    
# Line 356  Web Document Conformance Checker (BETA)< Line 490  Web Document Conformance Checker (BETA)<
490      <p>End tag of an element is not found before, for example,      <p>End tag of an element is not found before, for example,
491      an end tag of another element appears or      an end tag of another element appears or
492      the end of the document.  The document is non-conforming.</p>      the end of the document.  The document is non-conforming.</p>
493    
494        <p>Only <code>body</code>, <code>colgroup</code>, <code>dd</code>,
495        <code>dt</code>, <code>head</code>, <code>html</code>, <code>li</code>,
496        <code>ol</code>, <code>option</code>, <code>optgroup</code>,
497        <code>p</code>, <code>rb</code>, <code>rp</code>, <code>rt</code>,
498        <code>tbody</code>, <code>td</code>, <code>tfoot</code>,
499        <code>th</code>, <code>thead</code>, <code>tr</code>,
500        <code>ul</code> end tag can be omitted in HTML documents.
501        For any element except for void element, there must be an explicit
502        end tag.</p>
503    
504        <dl class="switch">
505        <dt>HTML <code>canvas</code> element</dt>
506          <dd>Though the element is void in earlier versions of Safari,
507          the <code>canvas</code> element is <em>no</em> longer
508          defined as empty.  There must be an end tag
509          <code>&lt;/canvas></code>.</dd>
510        </dl>
511    
512        <p>Note that misnesting tags, such as
513        <code class="bad example">&lt;a>&lt;b>&lt;/a>&lt;/b></code>, are not
514        allowed and they also cause this error.</p>
515      </d:desc>
516    </d:item>
517    
518    <d:item name="not first start tag"
519        class="parse-error">
520      <d:message xml:lang="en">This <code>&lt;html></code> tag is not
521      the first start tag.</d:message>
522      <d:desc>
523        <p>There is a start tag of the <code>html</code> element
524        that it not the first start tag in the input stream.
525        The document is non-conforming.</p>
526    
527        <p>In an HTML document, there cannot be more than one
528        <code>html</code> element and therefore there cannot be
529        more than one <code>&lt;html></code> tag.  In addition,
530        nothing can be placed before the <code>&lt;html></code> tag
531        except a <code>DOCTYPE</code>, white space characters,
532        and comments.</p>
533    </d:desc>    </d:desc>
534  </d:item>  </d:item>
535    
# Line 365  Web Document Conformance Checker (BETA)< Line 539  Web Document Conformance Checker (BETA)<
539    HTML.</d:message>    HTML.</d:message>
540    <d:desc xml:lang="en">    <d:desc xml:lang="en">
541      <p>The document contains a <code>DOCTYPE</code> declaration      <p>The document contains a <code>DOCTYPE</code> declaration
542      that is different from HTML5 <code>DOCTYPE</code> (i.e. <code>&lt;!DOCTYPE      that is different from HTML5 <code>DOCTYPE</code> (i.e.
543      HTML&gt;</code>).  The document is non-conforming.</p>      <code>&lt;!DOCTYPE HTML&gt;</code>).  The document is non-conforming.</p>
544    
545      <p>The document might or might not be conformant to      <p>The document might or might not be conformant to
546      some version of HTML.  However, conformance to any HTML      some version of HTML.  However, conformance to any HTML
# Line 386  Web Document Conformance Checker (BETA)< Line 560  Web Document Conformance Checker (BETA)<
560    
561      <p>For any end tag in HTML document, there must be a      <p>For any end tag in HTML document, there must be a
562      corresponding start tag.</p>      corresponding start tag.</p>
563    
564        <dl class="switch">
565        <dt>HTML <code>base</code>, <code>basefont</code>,
566        <code>bgsound</code>, <code>br</code>, <code>col</code>,
567        <code>embed</code>, <code>frame</code>, <code>hr</code>,
568        <code>image</code>, <code>img</code>, <code>input</code>,
569        <code>isindex</code>, <code>link</code>, <code>meta</code>,
570        <code>param</code>, <code>spacer</code>, or <code>wbr</code> element</dt>
571          <dd>End tag is not allowed for these elements, since
572          those content must always be empty.  Remove end tag.</dd>
573        <!-- keygen -->
574        <!-- command, event-source, nest, source -->
575        </dl>
576    </d:desc>    </d:desc>
577  </d:item>  </d:item>
578    
# Line 403  Web Document Conformance Checker (BETA)< Line 590  Web Document Conformance Checker (BETA)<
590      context.  The document is non-conforming.</p>      context.  The document is non-conforming.</p>
591    
592      <p>Possible causes:      <p>Possible causes:
593        <dl>        <ul>
594        <dt>If the erred element is an inline-level element (such        <li><p>A data character cannot be a child
595        as <code>a</code> or <code>span</code>)</dt>        of certain sectioning elements such as <code>body</code>,
596            <dd><p>A data character cannot be a child        <code>section</code>, and <code>blockquote</code>.</p>
597            of certain sectioning elements such as <code>body</code>,  
598            <code>section</code>, and <code>blockquote</code>.</p>        <p>Any inline-level content must be put
599          in e.g. paragraph element such as <code>p</code>.</p></li>
600            <p>Any inline-level content must be put        <li><p>Though some elements such as <code>div</code>,
601            in e.g. paragraph element such as <code>p</code>.</p></dd>        <code>li</code>, and <code>td</code> allow
602        <dt>If the erred element is a block-level element (such as        <em>either one</em> of block-level or inline-level content
603        <code>div</code> or <code>h<var>n</var></code>)</dt>        is allowed.  If there is a block-level content,
604            <dd><p>Though some elements such as <code>div</code>,        any inline-level content must be put
605            <code>li</code>, and <code>td</code> allow        in e.g. paragraph element such as <code>p</code>.</p></li>
606            <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>  
607      </p>      </p>
608    </d:desc>    </d:desc>
609  </d:item>  </d:item>
# Line 434  Web Document Conformance Checker (BETA)< Line 617  Web Document Conformance Checker (BETA)<
617      must contain a <code><var>$0</var></code> child element.      must contain a <code><var>$0</var></code> child element.
618      The document is non-conforming.</p>      The document is non-conforming.</p>
619    
620      <p>For example:      <dl class="switch">
621        <ul>      <dt>HTML <code>head</code> element</dt>
622        <li>The <code>head</code> element must contain exactly one        <dd>There must be a <code>title</code> child element.</dd>
623        <code>title</code> child element.</li>      <dt>HTML <code>html</code> element</dt>
624        <li><a href="#child-element-missing:td%7Cth">The <code>tr</code>        <dd>There must be a <code>head</code> child element followed
625        element must contain one or more <code>td</code> or <code>th</code>        by a <code>body</code> element.</dd>
626        child element.</a></li>      <dt>HTML <code>tr</code> element</dt>
627        </ul>        <dd><a href="#child-element-missing:td%7Cth">There must be
628      </p>        one or more <code>td</code> or <code>th</code> child element.</a></dd>
629        </dl>
630    </d:desc>    </d:desc>
631  </d:item>  </d:item>
632    
# Line 465  Web Document Conformance Checker (BETA)< Line 649  Web Document Conformance Checker (BETA)<
649      <p>An element appears where it is not allowed.  The document      <p>An element appears where it is not allowed.  The document
650      is non-conforming.</p>      is non-conforming.</p>
651    
     <p><strong>Note</strong>: The conformance checker does  
     <em>not</em> support form elements yet.</p>  
   
652      <p>Possible causes:      <p>Possible causes:
653        <dl>        <dl class="switch">
654        <dt>If the erred element is an inline-level element (such        <dt>If the element with the error is an inline-level element,
655        as <code>a</code> or <code>span</code>)</dt>        such as <code>a</code>, <code>progress</code>, or <code>img</code></dt>
656            <dd><p>An inline-level element cannot be a child            <dd><p>An inline-level element cannot be a child
657            of certain sectioning elements such as <code>body</code>,            of certain sectioning elements such as <code>body</code>,
658            <code>section</code>, and <code>blockquote</code>.</p>            <code>section</code>, and <code>blockquote</code>.</p>
659    
660            <p>Any inline-level content must be put            <p>Any inline-level content must be put
661            in e.g. paragraph element such as <code>p</code>.</p></dd>            in e.g. paragraph element such as <code>p</code>.</p></dd>
662        <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>,
663        <code>div</code> or <code>h<var>n</var></code>)</dt>        <code>div</code>, <code>h<var>n</var></code>,
664            <dd><p>Though some elements such as <code>div</code>,        <code>p</code>, or <code>section</code></dt>
665            <code>li</code>, and <code>td</code> allow            <dd><dl class="switch">
666            <em>either one</em> of block-level or inline-level content                <dt>If the parent element is <code>div</code>,
667            is allowed.  If there is a block-level content,                <code>li</code>, <code>td</code>, or <code>th</code></dt>
668            any inline-level content must be put                <!-- @@ TODO: more... -->
669            in e.g. paragraph element such as <code>p</code>.</p></dd>                    <!-- @@ TODO: <p><ul><li><p> -->
670        <dt>If the erred element is the root <code>html</code> element</dt>                    <dd><p>The parent element allows <em>either</em>
671            <dd><p>In an XHTML document, the root <code>html</code>                    block-level or inline-level content.  If there is a
672            element must have an <code>xmlns</code> attribute                    block-level content, any inline-level content must be
673            whose value is set to                    put in e.g. paragraph element such as <code>p</code>.</p>
674            <code>http://www.w3.org/1999/xhtml</code>.</p></dd>                    <p>For example, an HTML document fragment
675                      <code class="bad example">&lt;div>&lt;p>Hello!&lt;/p> World!&lt;/div></code>
676                      is non-conforming, since a word <q>World!</q> does not belong
677                      to any paragraph.  (If not part of any paragraph, what is
678                      it!?)  A conforming example would be:
679                        <pre class="example"><code>&lt;div>&lt;p>Hello!&lt;/p> &lt;p>World!&lt;/p>&lt;/div></code></pre>
680                      </p></dd>
681                  <dt>If the parent element does <em>not</em> allow
682                  block-level elements as content</dt>
683                      <dd>The element is not allowed to be inserted here.
684                      For example, a <code>div</code> element cannot be
685                      a child of an <code>h1</code> element.</dd>
686              </dl></dd>
687          <dt>If the element with the error is a <code>noscript</code> element</dt>
688              <dd>The <code>noscript</code> element is allowed only in the context
689              where a block-level or inline-level content is expected
690              and in the <code>head</code> element.
691              It cannot be used in e.g. <code>ul</code>, <code>table</code>,
692              or <code>select</code>.</dd>
693          <dt>If the element with the error is <code>blink</code>,
694          <code>center</code>, or <code>marquee</code> element</dt>
695              <dd>These elements are not part of the HTML standard.
696              Use CSS for styling control.</dd>
697    
698          <dt><code>button</code>, <code>datalist</code>,
699          <code>fieldset</code>, <code>form</code>,
700          <code>input</code>, <code>label</code>,
701          <code>optgroup</code>, <code>option</code>, <code>output</code>,
702          <code>rb</code>, <code>rp</code>, <code>rt</code>, <code>ruby</code>,
703          <code>textarea</code>, or <code>textarea</code> element</dt>
704          <!-- rbc, rtc ? -->
705              <dd>These elements are intentionally not supported by the conformance
706              checker <em>yet</em>.</dd>
707        </dl>        </dl>
708      </p>      </p>
709    </d:desc>    </d:desc>
710  </d:item>  </d:item>
711    
712    <d:item name="element not allowed:root"
713        class="content-model-error">
714      <d:message xml:lang="en">This element is not allowed as a root
715      element.</d:message>
716      <d:desc xml:lang="en">
717        <p>An element that is not allowed as the root element
718        is used as the root element of the document.  The document is
719        non-conforming, as far as the conformance checker can tell.</p>
720    
721        <dl class="switch">
722        <dt><code>html</code> element in an XHTML document</dt>
723            <dd><p>In an XHTML document, the root <code>html</code>
724            element must have an <code>xmlns</code> attribute
725            whose value is set to
726            <code>http://www.w3.org/1999/xhtml</code>.</p></dd>
727        <dt><code>rss</code> element</dt>
728            <dd><p>The document is written in some version of RSS.</p>
729            <p>The conformance checker does not support any version
730            of RSS.  Use Atom 1.0 for feed documents.</p></dd>
731        <dt><code>feed</code> element</dt>
732            <dd><p>The Atom <code>feed</code> element must be
733            in the <code>http://www.w3.org/2004/Atom</code>
734            namespace.</p>
735            <p>The conformance checker does not support Atom 0.3.
736            Use Atom 1.0 for feed documents.</p></dd>
737        </dl>
738      </d:desc>
739    </d:item>
740    
741    <d:item name="ps element missing"
742        class="content-model-error">
743      <d:message xml:lang="en">There is no <code><var>$0</var></code>
744      element before this element.</d:message>
745      <d:desc xml:lang="en">
746        <p>There must be an element before another element, but there
747        is not.  The document is non-conforming.</p>
748    
749        <p>For example, there must be a <code>dt</code> element
750        before any <code>dd</code> element.</p>
751      </d:desc>
752    </d:item>
753    
754  </section>  </section>
755    
756  <section id="attribute-errors">  <section id="attribute-errors">
# Line 510  Web Document Conformance Checker (BETA)< Line 765  Web Document Conformance Checker (BETA)<
765      is non-conforming.</p>      is non-conforming.</p>
766    
767      <p>Some attribute is defined as <i>required</i>.      <p>Some attribute is defined as <i>required</i>.
     For example, any <code>img</code> element must have  
     <code>alt</code> and <code>src</code> attributes specified.  
768      Without required attributes specified, user agents      Without required attributes specified, user agents
769      cannot provide the full functionality of the element      cannot provide full functionality of the element to the user.</p>
770      to the user.</p>  
771        <dl class="switch">
772        <dt>HTML <code>img</code> element</dt>
773            <dd>The <code>src</code> attribute must be specified.
774            Additionally, the <code>alt</code> attribute must be specified
775            in many cases.</dd>
776        <dt>HTML <code>link</code> element</dt>
777            <dd>The <code>rel</code> attribute must be specified.
778            Note that the <code>rev</code> attribute is obsolete.</dd>
779        </dl>
780      </d:desc>
781    </d:item>
782    
783    <d:item name="attribute not allowed" class="attribute-error">
784      <d:message xml:lang="en">Attribute
785      <code><var>{local-name}</var></code> is not allowed for
786      <code><var>{element-local-name}</var></code> element.</d:message>
787      <d:desc xml:lang="en">
788        <p>An attribute is specified where it is not allowed.
789        The document is non-conforming.</p>
790    
791        <dl>
792        <dt>HTML <code>meta</code> element</dt>
793            <dd>For HTML <code>meta</code> element, <em>only one</em> of
794            <code>name</code>, <code>http-equiv</code>, or <code>charset</code>
795            attribute is allowed.</dd>
796        </dl>
797    </d:desc>    </d:desc>
798  </d:item>  </d:item>
799    
# Line 522  Web Document Conformance Checker (BETA)< Line 801  Web Document Conformance Checker (BETA)<
801      class="attribute-error">      class="attribute-error">
802    <d:message xml:lang="en">The <code>xml:lang</code> attribute is not    <d:message xml:lang="en">The <code>xml:lang</code> attribute is not
803    allowed in HTML document.</d:message>    allowed in HTML document.</d:message>
804    <d:desc>    <d:desc xml:lang="en">
805      <p>The <code>xml:lang</code> attribute is not allowed in      <p>The <code>xml:lang</code> attribute is not allowed in
806      HTML document.  The document is non-conforming.</p>      HTML document.  The document is non-conforming.</p>
807    
808      <p>The <code>lang</code> attribute in the <code>null</code>      <p>Use of the <code>xml:lang</code> attribute is conforming
809      namespace for HTML elements is defined as conforming <em>only</em> for      <em>only</em> in XML documents.</p>
     XML document.</p>  
810    
811      <p>To specify natural language information in HTML document,      <p>To specify natural language information in HTML document,
812      use <code>lang</code> attribute instead.</p>      use <code>lang</code> attribute instead.</p>
813    
814        <p>XHTML 1.0 Appendix C was encouraged to specify both
815        <code>lang</code> and <code>xml:lang</code> attributes with
816        the same value.  Such a duplication has <em>no effect</em> in practice.
817        Use only one of <code>lang</code> (in HTML) or <code>xml:lang</code> (in
818        XML).</p>
819    
820      <!-- @@ ISSUE: xml:lang in non-HTML element in DOM5 HTML created      <!-- @@ ISSUE: xml:lang in non-HTML element in DOM5 HTML created
821           from an HTML document? -->           from an HTML document? -->
822    </d:desc>    </d:desc>
# Line 562  Web Document Conformance Checker (BETA)< Line 847  Web Document Conformance Checker (BETA)<
847      XML document.  The document is non-conforming.</p>      XML document.  The document is non-conforming.</p>
848    
849      <p>The <code>lang</code> attribute in <code>null</code>      <p>The <code>lang</code> attribute in <code>null</code>
850      namespace for HTML elements is defined as conforming <em>only</em> for      namespace for HTML elements is conforming <em>only</em> in
851      HTML document.</p>      HTML documents.</p>
852    
853      <p>To specify natural language information in XML document,      <p>To specify natural language information in XML document,
854      use <code>xml:lang</code> attribute instead.</p>      use <code>xml:lang</code> attribute instead.</p>
# Line 579  Web Document Conformance Checker (BETA)< Line 864  Web Document Conformance Checker (BETA)<
864      <p>The <code>xmlns</code> attribute in the <code>null</code>      <p>The <code>xmlns</code> attribute in the <code>null</code>
865      namespace is not allowed in XHTML document.</p>      namespace is not allowed in XHTML document.</p>
866    
867      <p>This error should not occur in conformance-checking      <p>This error should not occur in conformance-checking of
868      static documents.</p>      static documents.</p>
869    </d:desc>    </d:desc>
870  </d:item>  </d:item>
# Line 592  Web Document Conformance Checker (BETA)< Line 877  Web Document Conformance Checker (BETA)<
877  <d:item name="enumerated:invalid"  <d:item name="enumerated:invalid"
878      class="attribute-value-error">      class="attribute-value-error">
879    <d:message xml:lang="en">This attribute only allow a limited set of    <d:message xml:lang="en">This attribute only allow a limited set of
880    values and the specified value is not one of them.</d:message>    values and the specified value <code><var>{@}</var></code> is not one
881      of them.</d:message>
882      <d:desc xml:lang="en">
883        <p>For this attribute only several values are allowed and the
884        value of the attribute is not one of them.  The document
885        is non-conforming.</p>
886    
887        <dl>
888        <dt>HTML <code>meta</code> element, <code>http-equiv</code> attribute</dt>
889            <dd><p>Only <code>Default-Style</code> and <code>Refresh</code>
890            is allowed.</p>
891            <p>Value <code>Content-Type</code> is obsolete; for charset
892            declaration, the <code>charset</code> attribute can be used as:
893            <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
894            ... where <var>charset-name</var> is a name of the character encoding
895            of the document, such as <code>utf-8</code>.</p>
896            <p>Values <code>Content-Style-Type</code> and
897            <code>Content-Script-Type</code> are currently not allowed.</p>
898            <p>Value <code>Keywords</code> is not allowed.  Use
899            <code>name</code> attribute instead of <code>http-equiv</code>
900            attribute.</p>
901            <p>Values <code>Expires</code>, <code>Pragma</code>,
902            and <code>Cache-Control</code> are not allowed;
903            use <em>real</em> HTTP header fields for cache control.</p></dd>
904        </dl>
905      </d:desc>
906    </d:item>
907    
908    <d:item name="enumerated:invalid:http-equiv:content-type"
909        class="attribute-value-error">
910      <d:message xml:lang="en">Charset declaration syntax
911      <code>&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
912      is obsolete.</d:message>
913      <d:desc xml:lang="en">
914        <p>Old long charset declaration syntax
915        <code>&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
916        is in use.  The document is non‐conforming.</p>
917    
918        <p>The new charset declaration syntax is:
919          <pre><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
920        </p>
921      </d:desc>
922  </d:item>  </d:item>
923    
924  <d:item name="duplicate ID"  <d:item name="duplicate ID"
# Line 624  Web Document Conformance Checker (BETA)< Line 950  Web Document Conformance Checker (BETA)<
950    <d:message xml:lang="en">The link type <code><var>$0</var></code>    <d:message xml:lang="en">The link type <code><var>$0</var></code>
951    is non-conforming.</d:message>    is non-conforming.</d:message>
952    <d:desc xml:lang="en">    <d:desc xml:lang="en">
953      <p>The specified link type is non-conforming.  The entire document      <p>The specified link type is non-conforming, and therefore
954      is non-conforming.</p>      the document is non-conforming.</p>
955    
956      <p>For example, in place of non-conforming link type <code>copyright</code>      <dl class="switch">
957      you must use link type <code>license</code>.</p>      <dt>Link type <code>contents</code></dt>
958          <dd>Use link type <code>index</code>.</dd>
959        <dt>Link type <code>copyright</code></dt>
960          <dd>Use link type <code>license</code>.</dd>
961        <dt>Link type <code>home</code></dt>
962          <dd>Use link type <code>index</code>.</dd>
963        <dt>Link type <code>previous</code></dt>
964          <dd>Use link type <code>prev</code>.</dd>
965        <dt>Link type <code>start</code></dt>
966          <dd>Use link type <code>first</code>.</dd>
967        <dt>Link type <code>toc</code> or <code>top</code></dt>
968          <dd>Use link type <code>index</code>.</dd>
969        </dl>
970    </d:desc>    </d:desc>
971  </d:item>  </d:item>
972    
973  <d:item name="reserved browsing context name"  <d:item name="reserved browsing context name"
974      class="attribute-value-error">      class="attribute-value-error">
975    <d:message xml:lang="en">This browsing context name is reserved.</d:message>    <d:message xml:lang="en">Browsing context name
976    <d:item>    <code><var>{@}</var></code> is reserved.</d:message>
977      <d:desc xml:lang="en">
978      <p>The specified browsing context name is reserved.      <p>The specified browsing context name is reserved.
979      The document is non-conforming.</p>      The document is non-conforming.</p>
980    
# Line 648  Web Document Conformance Checker (BETA)< Line 987  Web Document Conformance Checker (BETA)<
987      browsing context names <code>_blank</code>,      browsing context names <code>_blank</code>,
988      <code>_main</code>, and <code>_replace</code>.      <code>_main</code>, and <code>_replace</code>.
989      However, they are <em>not</em> conforming attribute values.</p>      However, they are <em>not</em> conforming attribute values.</p>
990    </d:item>    </d:desc>
991  </d:item>  </d:item>
992    
993  </section>  </section>
# Line 668  Web Document Conformance Checker (BETA)< Line 1007  Web Document Conformance Checker (BETA)<
1007    
1008      <p><strong>Warning</strong>: The data served to the      <p><strong>Warning</strong>: The data served to the
1009      conforming checker might be out of date; it might have already      conforming checker might be out of date; it might have already
1010      been accepted or rejected, depending on which the document      been accepted or rejected.  The document might or might not be
1011      might be conforming or non-conforming.  See WHATWG Wiki      conforming depending on the status.  See WHATWG Wiki
1012      for the latest information.</p>      for the latest information.</p>
1013    </d:desc>    </d:desc>
1014  </d:item>  </d:item>
# Line 692  Web Document Conformance Checker (BETA)< Line 1031  Web Document Conformance Checker (BETA)<
1031    <code>th</code>) in the last row.</d:message>    <code>th</code>) in the last row.</d:message>
1032  </d:item>  </d:item>
1033    
1034    <d:item name="table:rowspan extends table"
1035        class="table-model-error">
1036      <d:message xml:lang="en">This <code>rowspan</code> attribute
1037      results in creating a table row that does not contain
1038      any cell anchored to it.</d:message>
1039      <d:desc xml:lang="en">
1040        <p>The <code>rowspan</code> attribute value of the cell
1041        is so specified that it extends a table in the row axis.
1042        However, the extended row does not contain any cell by itself.
1043        The document is non-conforming.</p>
1044    
1045        <p>For example, the table below is non-conforming:
1046          <pre class="html non-conforming example"><code>&lt;table>
1047    &lt;tbody>
1048    &lt;tr>&lt;td rowspan=2>&lt;/td>&lt;/tr>
1049    &lt;/tbody>
1050    &lt;/table></code></pre>
1051        ... since the second row contains only
1052        a cell that spans between first and second rows.</p>
1053      </d:desc>
1054    </d:item>
1055    
1056  </section>  </section>
1057    
1058  <section id="imt-warnings">  <section id="imt-warnings">
# Line 699  Web Document Conformance Checker (BETA)< Line 1060  Web Document Conformance Checker (BETA)<
1060    
1061  <d:item name="IMT:obsolete subtype"  <d:item name="IMT:obsolete subtype"
1062      class="should" level="s">      class="should" level="s">
1063    <d:message xml:lang="en">An <em>obsolete</em> subtype is used.</d:message>    <d:message xml:lang="en"><code><var>{@}</var></code>: An <em>obsolete</em>
1064      subtype is used.</d:message>
1065      <d:item xml:lang="en">
1066        <p>The specified Internet Media Type is registered with status
1067        of <i>OBSOLETE</i>.</p><!-- @@ SHOULD NOT? -->
1068        
1069        <dl class="swtich">
1070        <dt>Media type <code>text/ecmascript</code></dt>
1071          <dd>Media type <code>text/ecmascript</code> is obsoleted in
1072          favor of <code>application/ecmascript</code>.  Note that
1073          <code>text/javascript</code> would be better alternative
1074          for many cases.</dd>
1075        <dt>Media type <code>text/javascript</code></dt>
1076          <dd>Media type <code>text/javascript</code> is obsoleted by
1077          <abbr>IETF</abbr> with backward incompatible alternate
1078          <code>application/javascript</code> for architectural
1079          purity.<!-- @@ ref? -->  Realist may ignore this warning.</dd>
1080        </dl>
1081      </d:item>
1082  </d:item>  </d:item>
1083    
1084  <d:item name="IMT:private subtype"  <d:item name="IMT:private subtype"
1085      class="should" level="s">      class="should" level="s">
1086    <d:message xml:lang="en">A private (<code>x-</code> or <code>x.</code>)    <d:message xml:lang="en"><code><var>{@}</var></code>: A private
1087    subtype is used.</d:message>    (<code>x-</code> or <code>x.</code>) subtype is used.</d:message>
1088  </d:item>  </d:item>
1089    
1090  <d:item name="IMT:unregistered subtype"  <d:item name="IMT:unregistered subtype"
1091      class="should" level="s">      class="should" level="s">
1092    <d:message xml:lang="en">The subtype is not registered to IANA.</d:message>    <d:message xml:lang="en"><code><var>{@}</var></code>: The subtype is
1093      not registered to IANA.</d:message>
1094  <!-- TODO: Unknown message?? -->  <!-- TODO: Unknown message?? -->
1095  </d:item>  </d:item>
1096    
# Line 721  Web Document Conformance Checker (BETA)< Line 1101  Web Document Conformance Checker (BETA)<
1101    
1102  <d:item name="URI::syntax error"  <d:item name="URI::syntax error"
1103      class="must" level="m">      class="must" level="m">
1104    <d:message xml:lang="en">This string is syntactically not an IRI.</d:message>    <d:message xml:lang="en">The specified value is syntactically not an IRI
1105      reference.</d:message>
1106      <d:desc xml:lang="en">
1107        <p>The specified value does not satisfy the syntactical requirements
1108        for IRI references.  The document is non-conforming.</p>
1109    
1110        <p>Possible causes:
1111          <ul>
1112          <li>The string might contain one or more white space characters.
1113          Especially, the <code> </code> (<code>U+0020</code>
1114          <code class="charname">SPACE</code>) character cannot be
1115          used in IRI references.</li>
1116          </ul>
1117        </p>
1118      </d:desc>
1119  </d:item>  </d:item>
1120    
1121  </section>  </section>
1122    
1123  <section id="uri-warnings">  <section id="uri-shoulds">
1124  <h2>URI (or IRI) Warnings</h2>  <h2>URI (or IRI) Should-level Errors</h2>
1125    
1126  <d:item name="URI::dot-segment"  <d:item name="URI::dot-segment"
1127      class="should" level="s">      class="should" level="s">
1128    <d:message xml:lang="en">Dot-segment (<code>.</code> or    <d:message xml:lang="en">A dot-segment (<code>.</code> or
1129    <code>..</code>) should not occur in an absolute reference.</d:message>    <code>..</code>) occurs in an absolute reference.</d:message>
1130    <d:desc>    <d:desc>
1131      <p>Dot-segment (<code>.</code> or <code>..</code>) should      <p>Dot-segment (<code>.</code> or <code>..</code>) should
1132      not occur in an absolute reference.</p>      not occur in an absolute reference.</p>
# Line 747  Web Document Conformance Checker (BETA)< Line 1141  Web Document Conformance Checker (BETA)<
1141    
1142  <d:item name="URI::empty path"  <d:item name="URI::empty path"
1143      class="should" level="s">      class="should" level="s">
1144    <d:message xml:lang="en">This IRI should explicitly end with    <d:message xml:lang="en">This IRI does not end with
1145    <code>/</code>.</d:message>    a <code>/</code>.</d:message>
1146      <d:item xml:lang="en">
1147        <p>The IRI does not end with a <code>/</code>.  If there is an
1148        authority component in an IRI, a <code>/</code> should be present
1149        instead of empty path component.</p>
1150    
1151        <p>For example, <code>http://www.example.com<strong>/</strong></code>
1152        is preferred to <code>http://www.example.com</code>.</p>
1153      </d:item>
1154  </d:item>  </d:item>
1155    
1156  <d:item name="URI::lowercase hexadecimal digit"  <d:item name="URI::lowercase hexadecimal digit"
1157      class="should" level="s">      class="should" level="s">
1158    <d:message xml:lang="en">Hexadecimal digit in percent-encoding    <d:message xml:lang="en">A lowercase hexadecimal digit is used
1159    should be in lowercase.</d:message>    in percent-encoding.</d:message>
1160    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1161      <p>The hexadecimal digit in percent-encoding string in the IRI      <p>The hexadecimal digit in percent-encoding string in the IRI
1162      is in lowercase.  Though the IRI <em>is</em> conforming,      is in lowercase.  Though the IRI <em>is</em> conforming,
# Line 773  Web Document Conformance Checker (BETA)< Line 1175  Web Document Conformance Checker (BETA)<
1175    </d:desc>    </d:desc>
1176  </d:item>  </d:item>
1177    
1178    <d:item name="URI::uppercase scheme name"
1179        class="should" level="s">
1180      <d:message xml:lang="en">URI scheme name is in uppercase.</d:message>
1181      <d:desc xml:lang="en">
1182        <p>The scheme part of the IRI is written in uppercase letter.</p>
1183    
1184        <p>Uppercase scheme names are not required to be processed
1185        correctly.</p>
1186    <!-- @@
1187     RFC 3986 3.1.
1188     > Although schemes are case-
1189       insensitive, the canonical form is lowercase and documents that
1190       specify schemes must do so with lowercase letters.
1191    
1192     > An implementation ... should only produce lowercase scheme names for
1193       consistency.
1194    -->
1195      </d:desc>
1196    </d:item>
1197    
1198    </section>
1199    
1200    <section id="cache-manifest-errors">
1201    <h2>Cache Manifest Errors</h2>
1202    
1203    <d:item name="not manifest" class="must" level="m">
1204      <d:message xml:lang="en">This document is not a cache manifest.</d:message>
1205      <d:desc xml:lang="en">
1206        <p>The specified document is <em>not</em> a cache manifest.
1207        The document is non-conforming.</p>
1208    
1209        <p>An entity labeled as Internet media type
1210        <code>text/cache-manifest</code> must contain a cache manifest.</p>
1211    
1212        <p>A cache manifest must start with a line whose content is
1213        <code>CACHE MANIFEST</code> (exactly one space character between
1214        <code>CACHE</code> and <code>MANIFEST</code>).</p>
1215      </d:desc>
1216    </d:item>
1217  </section>  </section>
1218    
1219  <section id="unsupported-messages">  <section id="unsupported-messages">
1220  <h2><i>Unsupported</i> Messages</h2>  <h2><i>Unsupported</i> Messages</h2>
1221    
1222  <d:item name="attribute"  <d:item name="element"
1223      class="unsupported" level="unsupported">      class="unsupported" level="unsupported">
1224    <d:message xml:lang="en">This attribute is not supported by the    <d:message xml:lang="en">Conformance checking for element
1225    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
1226      might not be conforming</em>.</d:message>
1227    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1228      <p>The conformant checker does not support the attribute.      <p>The conformant checker does not support the element.
1229      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
1230    </d:desc>    </d:desc>
1231  </d:item>  </d:item>
1232    
1233  <d:item name="element"  <d:item name="attribute"
1234      class="unsupported" level="unsupported">      class="unsupported" level="unsupported">
1235    <d:message xml:lang="en">This element is not supported by the    <d:message xml:lang="en">Conformance checking for attribute
1236    conformance checker; <em>it might or might not be conforming</em>.</d:message>    <code><var>{local-name}</var></code> of element
1237      <code><var>{element-local-name}</var></code> is not supported;
1238      <em>it might or might not be conforming</em>.</d:message>
1239    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1240      <p>The conformant checker does not support the element.      <p>The conformant checker does not support the attribute.
1241      It cannot determine whether the document is conforming or not.</p>      It cannot determine whether the document is conforming or not.</p>
1242    </d:desc>    </d:desc>
1243  </d:item>  </d:item>
1244    
1245  <d:item name="link type"  <d:item name="link type"
1246      class="unsupported" level="unsupported">      class="unsupported" level="unsupported">
1247    <d:message xml:lang="en">The link type <code><var>$0</var></code> is not    <d:message xml:lang="en">Link type <code><var>$0</var></code> is not
1248    standardized or registered at the time of the release of the conformance    standardized or registered at the time of the release of the conformance
1249    checker; <em>it is non-conforming unless it has now been    checker; <em>it is non-conforming unless it now has been
1250    registered</em>.</d:message>    registered</em>.</d:message>
1251    <d:desc xml:lang="en">    <d:desc xml:lang="en">
1252      <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.
# Line 815  Web Document Conformance Checker (BETA)< Line 1259  Web Document Conformance Checker (BETA)<
1259      The link type might have been added to the registry since then.      The link type might have been added to the registry since then.
1260      In such case it might be conforming.  Otherwise, the      In such case it might be conforming.  Otherwise, the
1261      document is non-conforming.</p>      document is non-conforming.</p>
1262    
1263        <dl>
1264        <dt>Link types <code>shortcut icon</code></dt>
1265            <dd>Link type <code>shortcut</code> is not registered.
1266            Use only <code>icon</code> for linking to so-called favicon.</dd>
1267        </dl>
1268    </d:desc>    </d:desc>
1269  </d:item>  </d:item>
1270    
# Line 824  Web Document Conformance Checker (BETA)< Line 1274  Web Document Conformance Checker (BETA)<
1274    is not supported; <em>it might or might not be conforming.</em></d:message>    is not supported; <em>it might or might not be conforming.</em></d:message>
1275  </d:item>  </d:item>
1276    
 <d:item name="language tag"  
     class="unsupported" level="unsupported">  
   <d:message xml:lang="en">Conformance checking for language tag  
   is not supported; <em>it might or might not be conforming.</em></d:message>  
 </d:item>  
   
1277  <d:item name="media query"  <d:item name="media query"
1278      class="unsupported" level="unsupported">      class="unsupported" level="unsupported">
1279    <d:message xml:lang="en">Conformance checking for media query    <d:message xml:lang="en">Conformance checking for media query
# Line 861  manakaiIsHTML:1;;HTML Document Line 1305  manakaiIsHTML:1;;HTML Document
1305  manakaiIsHTML:0;;XML Document  manakaiIsHTML:0;;XML Document
1306  </d:catalog>  </d:catalog>
1307    
1308    <section id="levels">
1309    <h2>Error Levels</h2>
1310    
1311    <table id="levels-table">
1312    <thead>
1313    <tr><th scope="col">Level</th>
1314    <th scope="col">Conforming?</th>
1315    <th scope="col">Description</th>
1316    </tr>
1317    </thead>
1318    <tbody>
1319    <tr id="level-m" class="level-m">
1320    <th scope="row"><em class="rfc2119">MUST</em>‐level error</th>
1321    <td>Non‐conforming.</td>
1322    <td>A violation to a hard requirement of the specification.
1323    The document is non‐conforming.</td>
1324    </tr>
1325    <tr id="level-s" class="level-s">
1326    <th scope="row"><em class="rfc2119">SHOULD</em>‐level error</th>
1327    <td>Non‐conforming, but <em>in some case</em>
1328    conforming.</td>
1329    <td>A violation to a requirement of the specification.
1330    The violation might be legitimize in some case.  Otherwise,
1331    the document is non‐conforming.</td>
1332    </tr>
1333    <tr id="level-w" class="level-w">
1334    <th scope="row">Warning</th>
1335    <td>Conforming.</td>
1336    <td>A warning is an advice from the conformance checker to avoid
1337    to solve a problem in a confusing or possibly wrong way.
1338    It does not affect to the conformance of the document, and
1339    may sometimes be inappropriate.</td>
1340    </tr>
1341    <tr id="level-unsupported" class="level-unsupported">
1342    <th scope="row">Not supported</th>
1343    <td><em>Unknown</em>.</td>
1344    <td>Some feature that is not supported by the conformance checker
1345    is used in the document.</td>
1346    </tr>
1347    </tbody>
1348    </table>
1349    </section>
1350    
1351  <section id="license">  <section id="license">
1352  <h2>License of This Document</h2>  <h2>License of This Document</h2>
1353    
1354  <p>Copyright 2007 <a href="http://suika.fam.cx/~wakaba/who?">Wakaba</a></p>  <p>Copyright <time>2007</time>
1355  <p>This library is free software; you can redistribute it  <a href="http://suika.fam.cx/~wakaba/who?" rel="author" xml:lang="ja">Wakaba</a>
1356    <code class="mail">&lt;<a href="mailto:w@suika.fam.cx">w@suika.fam.cx</a>></code>.</p>
1357    
1358    <p>This document is free software; you can redistribute it
1359  and/or modify it under the same terms as Perl itself.</p>  and/or modify it under the same terms as Perl itself.</p>
1360  </section>  </section>
1361    
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