/[pub]/test/html-webhacc/error-description-source.xml
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revision 1.11 by wakaba, Mon Sep 10 11:51:09 2007 UTC revision 1.16 by wakaba, Sun Nov 18 11:05:12 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-character-encoding">
15    <h2>HTML5 Character Encoding Errors</h2>
16    
17    <d:item name="character encoding" class="format-charset must" level="m">
18      <d:message xml:lang="en">Character encoding <code><var>$0</var></code>
19      is not allowed for <abbr>HTML</abbr> document.</d:message>
20      <d:desc xml:lang="en">
21        <p>The character encoding used for the document is not allowed
22        for <abbr>HTML</abbr> document.  The document is non‐conforming.</p>
23      </d:desc>
24    </d:item>
25    
26    <d:item name="character encoding" class="format-charset should"
27        level="s">
28      <d:message xml:lang="en">Character encoding <code><var>$0</var></code>
29      should not be used for <abbr>HTML</abbr> document.</d:message>
30      <d:desc xml:lang="en">
31        <p>The character encoding used for the document is not recommended
32        for <abbr>HTML</abbr> document.  The document is non‐conforming
33        unless there is any good reason to use that encoding.</p>
34      </d:desc>
35    </d:item>
36    
37    <d:item name="character encoding" class="format-charset warning"
38        level="w">
39      <d:message xml:lang="en">Use of UTF-8 is encouraged.</d:message>
40      <d:desc xml:lang="en">
41        <p>Use of UTF-8 as the character encoding of the document is encouraged,
42        though the use of another character encoding is conforming.</p>
43      </d:desc>
44    </d:item>
45    
46    <d:item name="no character encoding declaration" class="format-charset error"
47        level="m">
48      <d:message xml:lang="en">There is no character encoding
49      declaration.</d:message>
50      <d:desc xml:lang="en">
51        <p>The document does not contain a character encoding
52        declaration.  Unless the character encoding is explicitly
53        specified in upper‐level protocol, e.g. in <abbr>HTTP</abbr>,
54        or is implied by <abbr>BOM</abbr>, there must be a character
55        encoding declaration.  The document is non‐conforming.</p>
56    
57        <p>The long character encoding declaration syntax
58        <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
59        is obsolete.  The new syntax is:</p>
60        <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
61    
62        <p>Note that the <code>encoding</code> declaration in <abbr>XML</abbr>
63        declaration has no effect for <abbr>HTML</abbr> document.</p>
64      </d:desc>
65    </d:item>
66    
67    <d:item name="non ascii superset" class="format-charset error"
68        level="m">
69      <d:message xml:lang="en">No character encoding metadata is found
70      in upper‐level protocol nor is there <abbr>BOM</abbr>, while
71      character encoding <code><var>$0</var></code>
72      is not a superset of <abbr>ASCII</abbr>.</d:message>
73      <d:desc xml:lang="en">
74        <p>The document is not labeled with character encoding name
75        in upper‐level protocol, e.g. in <abbr>HTTP</abbr>, and
76        the document is not begin with <abbr>BOM</abbr>.  In addition,
77        the character encoding of the document is not a superset of
78        <abbr>ASCII</abbr>.  The document is non‐conforming.</p>
79    
80        <p>Unless there is a <abbr>BOM</abbr>, the character encoding
81        for the document must be specified in e.g. <abbr>HTTP</abbr>‐level,
82        as:</p>
83        <pre class="http example"><code>Content-Type: text/html; charset=<var>charset-name</var></code></pre>
84    
85        <p>Existence of <abbr>HTML</abbr> character encoding declaration, i.e.
86        <code class="html example">&lt;meta charset="<var>charset-name</var>"></code>,
87        does not allow to omit <code>charset</code> parameter
88        for <abbr>HTML</abbr> document encoded in non‐<abbr>ASCII</abbr>
89        compatible encoding.</p>
90    
91        <p>Character encodings <code>Shift_JIS</code>, <code>Windows-31J</code>,
92        and <code>ISO-2022-JP</code> are <em>not</em> a superset of
93        <abbr>ASCII</abbr> for the purpose of <abbr>HTML</abbr> conformance.</p>
94      </d:desc>
95    </d:item>
96    
97    <d:item name="charset label detected" class="format-charset warning"
98        level="w">
99      <d:message xml:lang="en">While parsing the document as
100      <code><var>$0</var></code>, a character encoding declaration specifying
101      character encoding as <code><var>$1</var></code> is found.  The document
102      is reparsed.</d:message>
103      <d:desc xml:lang="en">
104        <p>While parsing a document in a character encoding,
105        a character encoding declaration which declares the character
106        encoding of the document as another character encoding is found.
107        The occurence of this warning itself does not make the document
108        non‐conforming.  However, the failure of the first attempt to
109        to detect the character encoding might be the result of non‐conformance
110        of the document.</p>
111    
112        <p>The document will be reparsed from the beginning.  Some error
113        or warning might be reported again.</p>
114    
115        <p>These are suggestions to avoid this warning:</p>
116        <ul>
117        <li>Specify <code>charset</code> parameter in the <code>Content-Type</code>
118        field in the <abbr>HTTP</abbr> header, as:
119        <pre class="HTTP example"><code>Content-Type: text/html; charset="<var>charset-name</var>"</code></pre></li>
120        <li>Put the character encoding declaration
121        (<code class="html example">&lt;meta charset="<var>charset-name</var>"></code>)
122        just after <code class="html example">&lt;head></code> start tag.</li>
123        <li>Use <code>UTF-8</code>.</li>
124        </ul>
125      </d:desc>
126    </d:item>
127    </section>
128    
129  <section id="html5-tokenize-error">  <section id="html5-tokenize-error">
130  <h2>HTML5 Parse Errors in Tokenization Stage</h2>  <h2>HTML5 Parse Errors in Tokenization Stage</h2>
131    
# Line 48  Web Document Conformance Checker (BETA)< Line 163  Web Document Conformance Checker (BETA)<
163    <d:message xml:lang="en">The <code>&amp;</code> character must    <d:message xml:lang="en">The <code>&amp;</code> character must
164    introduce a reference.</d:message>    introduce a reference.</d:message>
165    <d:desc xml:lang="en">    <d:desc xml:lang="en">
166      <p>An <code>&amp;</code> (<code>U+0026</code>      <p>An <code>&amp;</code> character which
     <code class="charname">AMPERSAND</code>) character which  
167      is not part of any reference appears in the input stream.      is not part of any reference appears in the input stream.
168      The document is non-conforming.</p>      The document is non‐conforming.</p>
169    
170      <p><strong>Any <code>&amp;</code> character in URI (or IRI)      <p><em>Any <code>&amp;</code> character in URI (or IRI)
171      must be escaped as <code>&amp;amp;</code>.</strong></p>      must be escaped as <code class="example">&amp;amp;</code>.</em></p>
172    
173      <p>The <code>&amp;</code> character must      <p>The <code>&amp;</code> character must
174      be the first character of a reference:      be the first character of a reference:
175        <dl>        <dl class="switch">
176        <dt>Named entity reference</dt>        <dt>Named entity reference</dt>
177            <dd><pre class="html example"><code>&amp;<var>entity-name</var>;</code></pre>            <dd><pre class="html example"><code>&amp;<var>entity-name</var>;</code></pre>
178            where <var>entity-name</var> is the name of the            where <var>entity-name</var> is the name of the
# Line 134  Web Document Conformance Checker (BETA)< Line 248  Web Document Conformance Checker (BETA)<
248    
249      <p>The string <code>&amp;#</code> must be the first two characters      <p>The string <code>&amp;#</code> must be the first two characters
250      of a reference:      of a reference:
251        <dl>        <dl class="switch">
252        <dt>Numeric character reference</dt>        <dt>Numeric character reference</dt>
253            <dd><pre class="html example"><code>&amp;#<var>d</var>;</code></pre>            <dd><pre class="html example"><code>&amp;#<var>d</var>;</code></pre>
254            where <var>d</var> is the decimal representation of            where <var>d</var> is the decimal representation of
# Line 189  Web Document Conformance Checker (BETA)< Line 303  Web Document Conformance Checker (BETA)<
303    
304      <dl class="switch">      <dl class="switch">
305      <dt>Comments</dt>      <dt>Comments</dt>
306        <dd>In HTML documents, comments must be introduced by        <dd>In HTML document, comments must be introduced by
307        <code>&lt;!--</code> (<code>&lt;!</code> <em>immediately</em> followed        <code class="example">&lt;!--</code> (<code>&lt;!</code>
308          <em>immediately</em> followed
309        by <em>two</em> <code>-</code>s) and must be terminated by        by <em>two</em> <code>-</code>s) and must be terminated by
310        <code>--></code>.  Strings <code>&lt;!</code> not followed        <code class="example">--></code>.
311          Strings <code>&lt;!</code> not followed
312        by <code>--</code> and <code>&lt;!-</code> not followed by        by <code>--</code> and <code>&lt;!-</code> not followed by
313        <code>-</code> are not valid open delimiters for comments.</dd>        <code>-</code> are not valid open delimiters for comments.</dd>
314      <dt>Marked sections, including <code>CDATA</code> sections</dt>      <dt>Marked sections, including <code>CDATA</code> sections</dt>
315        <dd>Marked sections are not allowed in HTML documents.</dd>        <dd>Marked sections are not allowed in HTML document.</dd>
316      <dt>Markup declarations</dt>      <dt>Markup declarations</dt>
317        <dd>Markup declarations, except <code>DOCTYPE</code>        <dd>Markup declarations, except for <code>DOCTYPE</code>
318        and comment declarations, are not allowed in HTML documents.</dd>        and comment declarations, are not allowed in HTML document.</dd>
319      <dt>String <code>&lt;!</code></dt>      <dt>String <code>&lt;!</code></dt>
320        <dd>String <code>&lt;!</code> must be escaped as        <dd>String <code>&lt;!</code> must be escaped as
321        <code>&amp;lt;!</code>.</dd>        <code class="example">&amp;lt;!</code>.</dd>
322      </dl>      </dl>
323    </d:desc>    </d:desc>
324  </d:item>  </d:item>
# Line 273  Web Document Conformance Checker (BETA)< Line 389  Web Document Conformance Checker (BETA)<
389      <code>embed</code>, <code>param</code>, <code>area</code>,      <code>embed</code>, <code>param</code>, <code>area</code>,
390      <code>col</code>, and <code>input</code> elements.</p>      <code>col</code>, and <code>input</code> elements.</p>
391    
392      <dl>      <dl class="switch">
393      <dt><code>&lt;script/></code></dt>      <dt><code>&lt;script/></code></dt>
394          <dd><p>The polytheistic slash cannot be used for <code>script</code>          <dd><p>The polytheistic slash cannot be used for <code>script</code>
395          element.  Even for an empty <code>script</code> element,          element.  Even for an empty <code>script</code> element,
396          there must be an explicit end tag <code>&lt;/script></code>.</p>          there must be an explicit end tag
397            <code class="html example">&lt;/script></code>.</p>
398    
399          <p><strong>NOTE</strong>: Though some user agents interpret          <p><strong>NOTE</strong>: Though some user agents interpret
400          polytheistic slash for <code>script</code> element as the          polytheistic slash for <code>script</code> element as the
# Line 289  Web Document Conformance Checker (BETA)< Line 406  Web Document Conformance Checker (BETA)<
406          <dd>These elements are themselves non-conforming.</dd>          <dd>These elements are themselves non-conforming.</dd>
407      <!-- isindex, image -->      <!-- isindex, image -->
408      <dt><code>&lt;command/></code>, <code>&lt;event-source/></code>,      <dt><code>&lt;command/></code>, <code>&lt;event-source/></code>,
409      <code>&lt;source/></code></dt>      <code>&lt;nest/></code>, or <code>&lt;source/></code></dt>
410          <dd>Future revision of HTML5 parsing algorithm is expected          <dd>Future revision of HTML5 parsing algorithm is expected
411          to allow polytheistic slash for these elements.</dd>          to allow polytheistic slash for these elements.</dd>
412      <dt><code>&lt;a/></code>, <code>&lt;p/></code></dt>      <dt><code>&lt;a/></code>, <code>&lt;p/></code></dt>
413          <dd>These elements are not always empty and therefore          <dd>These elements are not always empty and therefore
414          polytheistic slash is not allowed.</dd>          polytheistic slash is not allowed.  Use explicit end tag
415            to represent empty element as:
416              <pre class="example html"><code>&lt;p>&lt;/p></code></pre>
417            </dd>
418      </dl>      </dl>
419    
420      <p>Note that, unlike in XML, the polytheistic slash has      <p>Note that, unlike in XML, the polytheistic slash has
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434      (<code>&lt;?xml-stylesheet <var>...</var>?></code>), are not allowed      (<code>&lt;?xml-stylesheet <var>...</var>?></code>), are not allowed
435      in the HTML syntax.  The document is non-conforming.</p>      in the HTML syntax.  The document is non-conforming.</p>
436    
437      <dl>      <dl class="switch">
438        <dt><code>&lt;?xbl?></code> (<abbr>XBL</abbr> Association)</dt>
439          <dd>An <abbr>XBL</abbr> binding cannot be associated by
440          <abbr title="processing instruction">PI</abbr> in <abbr>HTML</abbr>
441          document.  Use <code>binding</code> property in <abbr>CSS</abbr>
442          style sheet as:
443            <pre class="html example"><code>&lt;style>
444    p {
445      binding: url(binding.xbl);
446    }
447    &lt;/style></code></pre>
448          </dd>
449      <dt><code>&lt;?xml?&gt;</code> (XML declaration)</dt>      <dt><code>&lt;?xml?&gt;</code> (XML declaration)</dt>
450          <dd>XML declaration is unnecessary for HTML documents.</dd>          <dd>XML declaration is unnecessary for HTML documents.</dd>
451      <dt><code>&lt;?xml-stylesheet?></code> (XML style sheet      <dt><code>&lt;?xml-stylesheet?></code> (XML style sheet
452      <abbr title="processing instruction">PI</abbr></dt>      <abbr title="processing instruction">PI</abbr>)</dt>
453          <dd>Use HTML <code>link</code> element with <code>rel</code>          <dd>Use HTML <code>link</code> element with <code>rel</code>
454          attribute set to <code>stylesheet</code> (or,          attribute set to <code>stylesheet</code> (or,
455          <code>alternate stylesheet</code> for an alternate style          <code>alternate stylesheet</code> for an alternate style
456          sheet).</dd>          sheet).
457      <dt><code>&lt;?php?&gt;</code> (PHP code)</dt>            <pre class="example html"><code>&lt;link rel=stylesheet href="path/to/stylesheet.css"></code></pre>
458            </dd>
459        <dt><code>&lt;?php?&gt;</code> or
460        <code>&lt;? <var>... <abbr>PHP</abbr> code ...</var> ?&gt;</code>
461        (<abbr>PHP</abbr> code)</dt>
462          <dd>The conformance checker does <em>not</em> support          <dd>The conformance checker does <em>not</em> support
463          checking for PHP source documents.</dd>          checking for PHP source documents.</dd>
464      <dt>Other processing instructions</dt>      <dt>Other processing instructions</dt>
# Line 470  Web Document Conformance Checker (BETA)< Line 605  Web Document Conformance Checker (BETA)<
605      </p>      </p>
606    
607      <p>Only white space characters and comments are allowed      <p>Only white space characters and comments are allowed
608      before the <code>DOCTYPE</code>.</p>      before the <code>DOCTYPE</code>.  XML declaration is <em>not</em>
609        allowed in HTML document.</p>
610    </d:desc>    </d:desc>
611  </d:item>  </d:item>
612    
# Line 493  Web Document Conformance Checker (BETA)< Line 629  Web Document Conformance Checker (BETA)<
629      For any element except for void element, there must be an explicit      For any element except for void element, there must be an explicit
630      end tag.</p>      end tag.</p>
631    
632        <dl class="switch">
633        <dt>HTML <code>canvas</code> element</dt>
634          <dd>Though the element is void in earlier versions of Safari,
635          the <code>canvas</code> element is <em>no</em> longer
636          defined as empty.  There must be an end tag
637          <code class="html example">&lt;/canvas></code>.</dd>
638        </dl>
639    
640      <p>Note that misnesting tags, such as      <p>Note that misnesting tags, such as
641      <code class="bad example">&lt;a>&lt;b>&lt;/a>&lt;/b></code>, are not      <code class="bad example">&lt;a>&lt;b>&lt;/a>&lt;/b></code>, are not
642      allowed and they also cause this error.</p>      allowed and they also cause this error.</p>
# Line 524  Web Document Conformance Checker (BETA)< Line 668  Web Document Conformance Checker (BETA)<
668    <d:desc xml:lang="en">    <d:desc xml:lang="en">
669      <p>The document contains a <code>DOCTYPE</code> declaration      <p>The document contains a <code>DOCTYPE</code> declaration
670      that is different from HTML5 <code>DOCTYPE</code> (i.e.      that is different from HTML5 <code>DOCTYPE</code> (i.e.
671      <code>&lt;!DOCTYPE HTML&gt;</code>).  The document is non-conforming.</p>      <code class="example html">&lt;!DOCTYPE HTML&gt;</code>).
672        The document is non‐conforming.</p>
673    
674      <p>The document might or might not be conformant to      <p>The document might or might not be conformant to
675      some version of HTML.  However, conformance to any HTML      some version of HTML.  However, conformance to any HTML
# Line 544  Web Document Conformance Checker (BETA)< Line 689  Web Document Conformance Checker (BETA)<
689    
690      <p>For any end tag in HTML document, there must be a      <p>For any end tag in HTML document, there must be a
691      corresponding start tag.</p>      corresponding start tag.</p>
692    
693        <dl class="switch">
694        <dt>HTML <code>base</code>, <code>basefont</code>,
695        <code>bgsound</code>, <code>br</code>, <code>col</code>,
696        <code>embed</code>, <code>frame</code>, <code>hr</code>,
697        <code>image</code>, <code>img</code>, <code>input</code>,
698        <code>isindex</code>, <code>link</code>, <code>meta</code>,
699        <code>param</code>, <code>spacer</code>, or <code>wbr</code> element</dt>
700          <dd>End tag is not allowed for these elements, since
701          those content must always be empty.  Remove end tag.</dd>
702        <!-- keygen -->
703        <!-- command, event-source, nest, source -->
704        </dl>
705    </d:desc>    </d:desc>
706  </d:item>  </d:item>
707    
# Line 588  Web Document Conformance Checker (BETA)< Line 746  Web Document Conformance Checker (BETA)<
746      must contain a <code><var>$0</var></code> child element.      must contain a <code><var>$0</var></code> child element.
747      The document is non-conforming.</p>      The document is non-conforming.</p>
748    
749      <p>For example:      <dl class="switch">
750        <ul>      <dt>HTML <code>head</code> element</dt>
751        <li>The <code>head</code> element must contain exactly one        <dd>There must be a <code>title</code> child element.</dd>
752        <code>title</code> child element.</li>      <dt>HTML <code>html</code> element</dt>
753        <li><a href="#child-element-missing:td%7Cth">The <code>tr</code>        <dd>There must be a <code>head</code> child element followed
754        element must contain one or more <code>td</code> or <code>th</code>        by a <code>body</code> element.</dd>
755        child element.</a></li>      <dt>HTML <code>tr</code> element</dt>
756        </ul>        <dd><a href="#child-element-missing:td%7Cth">There must be
757      </p>        one or more <code>td</code> or <code>th</code> child element.</a></dd>
758        </dl>
759    </d:desc>    </d:desc>
760  </d:item>  </d:item>
761    
# Line 642  Web Document Conformance Checker (BETA)< Line 801  Web Document Conformance Checker (BETA)<
801                    block-level content, any inline-level content must be                    block-level content, any inline-level content must be
802                    put in e.g. paragraph element such as <code>p</code>.</p>                    put in e.g. paragraph element such as <code>p</code>.</p>
803                    <p>For example, an HTML document fragment                    <p>For example, an HTML document fragment
804                    <code class="bad example">&lt;div>&lt;p>Hello!&lt;/p> World!&lt;/div></code>                    <code class="html bad example">&lt;div>&lt;p>Hello!&lt;/p> World!&lt;/div></code>
805                    is non-conforming, since a word <q>World!</q> does not belong                    is non-conforming, since a word <q>World!</q> does not belong
806                    to any paragraph.  (If not part of any paragraph, what is                    to any paragraph.  (If not part of any paragraph, what is
807                    it!?)  A conforming example would be:                    it!?)  A conforming example would be:
808                      <pre class="example"><code>&lt;div>&lt;p>Hello!&lt;/p> &lt;p>World!&lt;/p>&lt;/div></code></pre>                      <pre class="html example"><code>&lt;div>&lt;p>Hello!&lt;/p> &lt;p>World!&lt;/p>&lt;/div></code></pre>
809                    </p></dd>                    </p></dd>
810                <dt>If the parent element does <em>not</em> allow                <dt>If the parent element does <em>not</em> allow
811                block-level elements as content</dt>                block-level elements as content</dt>
# Line 660  Web Document Conformance Checker (BETA)< Line 819  Web Document Conformance Checker (BETA)<
819            and in the <code>head</code> element.            and in the <code>head</code> element.
820            It cannot be used in e.g. <code>ul</code>, <code>table</code>,            It cannot be used in e.g. <code>ul</code>, <code>table</code>,
821            or <code>select</code>.</dd>            or <code>select</code>.</dd>
       <dt>If the element with the error is the <code>html</code> element  
       that is the root element of an XHTML document</dt>  
           <dd><p>In an XHTML document, the root <code>html</code>  
           element must have an <code>xmlns</code> attribute  
           whose value is set to  
           <code>http://www.w3.org/1999/xhtml</code>.</p></dd>  
822        <dt>If the element with the error is <code>blink</code>,        <dt>If the element with the error is <code>blink</code>,
823        <code>center</code>, or <code>marquee</code> element</dt>        <code>center</code>, or <code>marquee</code> element</dt>
824            <dd>These elements are not part of the HTML standard.            <dd>These elements are not part of the HTML standard.
# Line 685  Web Document Conformance Checker (BETA)< Line 838  Web Document Conformance Checker (BETA)<
838    </d:desc>    </d:desc>
839  </d:item>  </d:item>
840    
841    <d:item name="element not allowed:root"
842        class="content-model-error">
843      <d:message xml:lang="en">This element is not allowed as a root
844      element.</d:message>
845      <d:desc xml:lang="en">
846        <p>An element that is not allowed as the root element
847        is used as the root element of the document.  The document is
848        non-conforming, as far as the conformance checker can tell.</p>
849    
850        <dl class="switch">
851        <dt><code>html</code> element in an XHTML document</dt>
852            <dd><p>In <abbr>XHTML</abbr> document, the root <code>html</code>
853            element must have an <code>xmlns</code> attribute as:
854              <pre class="xml example"><code>&lt;html xmlns="http://www.w3.org/1999/xhtml"></code></pre></p></dd>
855        <dt><code>rss</code> element</dt>
856            <dd><p>The document is written in some version of RSS.</p>
857            <p>The conformance checker does not support any version
858            of RSS.  Use Atom 1.0 for feed documents.</p></dd>
859        <dt><code>feed</code> element</dt>
860            <dd><p>The Atom <code>feed</code> element must be
861            in the <code>http://www.w3.org/2005/Atom</code>
862            namespace as:
863              <pre class="xml example"><code>&lt;feed xmlns="http://www.w3.org/2005/Atom"></code></pre>
864            </p>
865            <p>The conformance checker does not support Atom 0.3.
866            Use Atom 1.0 for feed documents.</p></dd>
867        </dl>
868      </d:desc>
869    </d:item>
870    
871  <d:item name="ps element missing"  <d:item name="ps element missing"
872      class="content-model-error">      class="content-model-error">
873    <d:message xml:lang="en">There is no <code><var>$0</var></code>    <d:message xml:lang="en">There is no <code><var>$0</var></code>
# Line 833  Web Document Conformance Checker (BETA)< Line 1016  Web Document Conformance Checker (BETA)<
1016    
1017      <dl>      <dl>
1018      <dt>HTML <code>meta</code> element, <code>http-equiv</code> attribute</dt>      <dt>HTML <code>meta</code> element, <code>http-equiv</code> attribute</dt>
1019          <dd><p>Only <code>Default-Style</code> and <code>Refresh</code>          <dd><p>Only values <code>Default-Style</code> and <code>Refresh</code>
1020          is allowed.</p>          are allowed.</p>
1021          <p>Value <code>Content-Type</code> is obsolete; for charset          <p>Value <code>Content-Type</code> is obsolete; for charset
1022          declaration, the <code>charset</code> attribute can be used as:          declaration, the <code>charset</code> attribute can be used as:
1023          <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>          <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
# Line 852  Web Document Conformance Checker (BETA)< Line 1035  Web Document Conformance Checker (BETA)<
1035    </d:desc>    </d:desc>
1036  </d:item>  </d:item>
1037    
1038    <d:item name="enumerated:invalid:http-equiv:content-type"
1039        class="attribute-value-error">
1040      <d:message xml:lang="en">Character encoding declaration syntax
1041      <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
1042      is obsolete.</d:message>
1043      <d:desc xml:lang="en">
1044        <p>Old long character encoding declaration syntax
1045        <code class="html bad example">&lt;meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code>
1046        is in use.  The document is non‐conforming.</p>
1047    
1048        <p>The new character encoding declaration syntax is:
1049          <pre class="html example"><code>&lt;meta charset="<var>charset-name</var>"></code></pre>
1050        </p>
1051      </d:desc>
1052    </d:item>
1053    
1054  <d:item name="duplicate ID"  <d:item name="duplicate ID"
1055      class="attribute-value-error">      class="attribute-value-error">
1056    <d:message xml:lang="en">This identifier has already been    <d:message xml:lang="en">This identifier has already been
# Line 884  Web Document Conformance Checker (BETA)< Line 1083  Web Document Conformance Checker (BETA)<
1083      <p>The specified link type is non-conforming, and therefore      <p>The specified link type is non-conforming, and therefore
1084      the document is non-conforming.</p>      the document is non-conforming.</p>
1085    
1086      <dl>      <dl class="switch">
1087      <dt>Link type <code>contents</code></dt>      <dt>Link type <code>contents</code></dt>
1088        <dd>Use link type <code>index</code>.</dd>        <dd>Use link type <code>index</code>.</dd>
1089      <dt>Link type <code>copyright</code></dt>      <dt>Link type <code>copyright</code></dt>
1090        <dd>Use link type <code>license</code>.</dd>        <dd>Use link type <code>license</code>.</dd>
1091      <dt>Link type <code>home</code></dt>      <dt>Link type <code>home</code></dt>
1092        <dd>Use link type <code>index</code>.</dd>        <dd>Use link type <code>index</code>.</dd>
1093        <dt>Link type <code>previous</code></dt>
1094          <dd>Use link type <code>prev</code>.</dd>
1095      <dt>Link type <code>start</code></dt>      <dt>Link type <code>start</code></dt>
1096        <dd>Use link type <code>first</code>.</dd>        <dd>Use link type <code>first</code>.</dd>
1097      <dt>Link type <code>toc</code></dt>      <dt>Link type <code>toc</code> or <code>top</code></dt>
1098        <dd>Use link type <code>index</code>.</dd>        <dd>Use link type <code>index</code>.</dd>
1099      </dl>      </dl>
1100    </d:desc>    </d:desc>
# Line 936  Web Document Conformance Checker (BETA)< Line 1137  Web Document Conformance Checker (BETA)<
1137    
1138      <p><strong>Warning</strong>: The data served to the      <p><strong>Warning</strong>: The data served to the
1139      conforming checker might be out of date; it might have already      conforming checker might be out of date; it might have already
1140      been accepted or rejected, depending on which the document      been accepted or rejected.  The document might or might not be
1141      might be conforming or non-conforming.  See WHATWG Wiki      conforming depending on the status.  See WHATWG Wiki
1142      for the latest information.</p>      for the latest information.</p>
1143    </d:desc>    </d:desc>
1144  </d:item>  </d:item>
# Line 972  Web Document Conformance Checker (BETA)< Line 1173  Web Document Conformance Checker (BETA)<
1173      The document is non-conforming.</p>      The document is non-conforming.</p>
1174    
1175      <p>For example, the table below is non-conforming:      <p>For example, the table below is non-conforming:
1176        <pre class="html non-conforming example"><code>&lt;table>        <pre class="html bad example"><code>&lt;table>
1177  &lt;tbody>  &lt;tbody>
1178  &lt;tr>&lt;td rowspan=2>&lt;/td>&lt;/tr>  &lt;tr>&lt;td rowspan=2>&lt;/td>&lt;/tr>
1179  &lt;/tbody>  &lt;/tbody>
# Line 991  Web Document Conformance Checker (BETA)< Line 1192  Web Document Conformance Checker (BETA)<
1192      class="should" level="s">      class="should" level="s">
1193    <d:message xml:lang="en"><code><var>{@}</var></code>: An <em>obsolete</em>    <d:message xml:lang="en"><code><var>{@}</var></code>: An <em>obsolete</em>
1194    subtype is used.</d:message>    subtype is used.</d:message>
1195      <d:item xml:lang="en">
1196        <p>The specified Internet Media Type is registered with status
1197        of <i>OBSOLETE</i>.</p><!-- @@ SHOULD NOT? -->
1198        
1199        <dl class="swtich">
1200        <dt>Media type <code>text/ecmascript</code></dt>
1201          <dd>Media type <code>text/ecmascript</code> is obsoleted in
1202          favor of <code>application/ecmascript</code>.  Note that
1203          <code>text/javascript</code> would be better alternative
1204          for many cases.</dd>
1205        <dt>Media type <code>text/javascript</code></dt>
1206          <dd>Media type <code>text/javascript</code> is obsoleted by
1207          <abbr>IETF</abbr> with backward incompatible alternate
1208          <code>application/javascript</code> for architectural
1209          purity.<!-- @@ ref? -->  Realist may ignore this warning.</dd>
1210        </dl>
1211      </d:item>
1212  </d:item>  </d:item>
1213    
1214  <d:item name="IMT:private subtype"  <d:item name="IMT:private subtype"
# Line 1055  Web Document Conformance Checker (BETA)< Line 1273  Web Document Conformance Checker (BETA)<
1273      class="should" level="s">      class="should" level="s">
1274    <d:message xml:lang="en">This IRI does not end with    <d:message xml:lang="en">This IRI does not end with
1275    a <code>/</code>.</d:message>    a <code>/</code>.</d:message>
1276      <d:item xml:lang="en">
1277        <p>The IRI does not end with a <code>/</code>.  If there is an
1278        authority component in an IRI, a <code>/</code> should be present
1279        instead of empty path component.</p>
1280    
1281        <p>For example, <code>http://www.example.com<strong>/</strong></code>
1282        is preferred to <code>http://www.example.com</code>.</p>
1283      </d:item>
1284  </d:item>  </d:item>
1285    
1286  <d:item name="URI::lowercase hexadecimal digit"  <d:item name="URI::lowercase hexadecimal digit"
# Line 1101  Web Document Conformance Checker (BETA)< Line 1327  Web Document Conformance Checker (BETA)<
1327    
1328  </section>  </section>
1329    
1330    <section id="cache-manifest-errors">
1331    <h2>Cache Manifest Errors</h2>
1332    
1333    <d:item name="not manifest" class="must" level="m">
1334      <d:message xml:lang="en">This document is not a cache manifest.</d:message>
1335      <d:desc xml:lang="en">
1336        <p>The specified document is <em>not</em> a cache manifest.
1337        The document is non-conforming.</p>
1338    
1339        <p>An entity labeled as Internet media type
1340        <code>text/cache-manifest</code> must contain a cache manifest.</p>
1341    
1342        <p>A cache manifest must start with a line whose content is
1343        <code class="manifest example">CACHE MANIFEST</code>
1344        (exactly one space character between
1345        <code>CACHE</code> and <code>MANIFEST</code>).</p>
1346      </d:desc>
1347    </d:item>
1348    </section>
1349    
1350  <section id="unsupported-messages">  <section id="unsupported-messages">
1351  <h2><i>Unsupported</i> Messages</h2>  <h2><i>Unsupported</i> Messages</h2>
1352    
# Line 1159  Web Document Conformance Checker (BETA)< Line 1405  Web Document Conformance Checker (BETA)<
1405    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>
1406  </d:item>  </d:item>
1407    
 <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>  
   
1408  <d:item name="media query"  <d:item name="media query"
1409      class="unsupported" level="unsupported">      class="unsupported" level="unsupported">
1410    <d:message xml:lang="en">Conformance checking for media query    <d:message xml:lang="en">Conformance checking for media query
# Line 1196  manakaiIsHTML:1;;HTML Document Line 1436  manakaiIsHTML:1;;HTML Document
1436  manakaiIsHTML:0;;XML Document  manakaiIsHTML:0;;XML Document
1437  </d:catalog>  </d:catalog>
1438    
1439    <section id="levels">
1440    <h2>Error Levels</h2>
1441    
1442    <table id="levels-table">
1443    <thead>
1444    <tr><th scope="col">Level</th>
1445    <th scope="col">Conforming?</th>
1446    <th scope="col">Description</th>
1447    </tr>
1448    </thead>
1449    <tbody>
1450    <tr id="level-m" class="level-m">
1451    <th scope="row"><em class="rfc2119">MUST</em>‐level error</th>
1452    <td>Non‐conforming.</td>
1453    <td>A violation to a hard requirement of the specification.
1454    The document is non‐conforming.</td>
1455    </tr>
1456    <tr id="level-s" class="level-s">
1457    <th scope="row"><em class="rfc2119">SHOULD</em>‐level error</th>
1458    <td>Non‐conforming, but <em>in some case</em>
1459    conforming.</td>
1460    <td>A violation to a requirement of the specification.
1461    The violation might be legitimize in some case.  Otherwise,
1462    the document is non‐conforming.</td>
1463    </tr>
1464    <tr id="level-w" class="level-w">
1465    <th scope="row">Warning</th>
1466    <td>Conforming.</td>
1467    <td>A warning is an advice from the conformance checker to avoid
1468    to solve a problem in a confusing or possibly wrong way.
1469    It does not affect to the conformance of the document, and
1470    may sometimes be inappropriate.</td>
1471    </tr>
1472    <tr id="level-unsupported" class="level-unsupported">
1473    <th scope="row">Not supported</th>
1474    <td><em>Unknown</em>.</td>
1475    <td>Some feature that is not supported by the conformance checker
1476    is used in the document.</td>
1477    </tr>
1478    </tbody>
1479    </table>
1480    </section>
1481    
1482  <section id="license">  <section id="license">
1483  <h2>License of This Document</h2>  <h2>License of This Document</h2>
1484    
1485  <p>Copyright 2007 <a href="http://suika.fam.cx/~wakaba/who?" rel="author" xml:lang="ja">Wakaba</a></p>  <p>Copyright <time>2007</time>
1486    <a href="http://suika.fam.cx/~wakaba/who?" rel="author" xml:lang="ja">Wakaba</a>
1487    <code class="mail">&lt;<a href="mailto:[email protected]">[email protected]</a>></code>.</p>
1488    
1489  <p>This document is free software; you can redistribute it  <p>This document is free software; you can redistribute it
1490  and/or modify it under the same terms as Perl itself.</p>  and/or modify it under the same terms as Perl itself.</p>
1491  </section>  </section>
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