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<body> |
<body> |
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<h1>Description of Errors</h1> |
<h1>Description of Errors</h1> |
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<section id="html5-character-encoding"> |
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<h2>HTML5 Character Encoding Errors</h2> |
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<div class="section format-charset must" id="m:character-encoding"><h3>Character encoding <code><var>$0</var></code> |
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is not allowed for <abbr>HTML</abbr> document.</h3> |
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<p>The character encoding used for the document is not allowed |
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for <abbr>HTML</abbr> document. The document is non‐conforming.</p> |
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</div> |
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<div class="section format-charset should" id="s:character-encoding"><h3>Character encoding <code><var>$0</var></code> |
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should not be used for <abbr>HTML</abbr> document.</h3> |
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<p>The character encoding used for the document is not recommended |
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for <abbr>HTML</abbr> document. The document is non‐conforming |
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unless there is any good reason to use that encoding.</p> |
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</div> |
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<div class="section format-charset warning" id="w:character-encoding"><h3>Use of UTF-8 is encouraged.</h3> |
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<p>Use of UTF-8 as the character encoding of the document is encouraged, |
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though the use of another character encoding is conforming.</p> |
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</div> |
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<div class="section format-charset error" id="m:no-character-encoding-declaration"><h3>There is no character encoding |
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declaration.</h3> |
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<p>The document does not contain a character encoding |
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declaration. Unless the character encoding is explicitly |
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specified in upper‐level protocol, e.g. in <abbr>HTTP</abbr>, |
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or is implied by <abbr>BOM</abbr>, there must be a character |
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encoding declaration. The document is non‐conforming.</p> |
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<p>The long character encoding declaration syntax |
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<code class="html bad example"><meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code> |
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is obsolete. The new syntax is:</p> |
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<pre class="html example"> |
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<code><meta charset="<var>charset-name</var>"></code></pre> |
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<p>Note that the <code>encoding</code> declaration in <abbr>XML</abbr> |
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declaration has no effect for <abbr>HTML</abbr> document.</p> |
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</div> |
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<div class="section format-charset error" id="m:non-ascii-superset"><h3>No character encoding metadata is found |
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in upper‐level protocol nor is there <abbr>BOM</abbr>, while |
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character encoding <code><var>$0</var></code> |
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is not a superset of <abbr>ASCII</abbr>.</h3> |
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<p>The document is not labeled with character encoding name |
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in upper‐level protocol, e.g. in <abbr>HTTP</abbr>, and |
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the document is not begin with <abbr>BOM</abbr>. In addition, |
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the character encoding of the document is not a superset of |
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<abbr>ASCII</abbr>. The document is non‐conforming.</p> |
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<p>Unless there is a <abbr>BOM</abbr>, the character encoding |
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for the document must be specified in e.g. <abbr>HTTP</abbr>‐level, |
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as:</p> |
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<pre class="http example"> |
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<code>Content-Type: text/html; charset=<var>charset-name</var></code></pre> |
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<p>Existence of <abbr>HTML</abbr> character encoding declaration, i.e. |
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<code class="html example"><meta charset="<var>charset-name</var>"></code>, |
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does not allow to omit <code>charset</code> parameter |
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for <abbr>HTML</abbr> document encoded in non‐<abbr>ASCII</abbr> |
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compatible encoding.</p> |
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<p>Character encodings <code>Shift_JIS</code>, <code>Windows-31J</code>, |
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and <code>ISO-2022-JP</code> are <em>not</em> a superset of |
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<abbr>ASCII</abbr> for the purpose of <abbr>HTML</abbr> conformance.</p> |
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</div> |
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<div class="section format-charset warning" id="w:charset-label-detected"><h3>While parsing the document as |
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<code><var>$0</var></code>, a character encoding declaration specifying |
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character encoding as <code><var>$1</var></code> is found. The document |
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is reparsed.</h3> |
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<p>While parsing a document in a character encoding, |
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a character encoding declaration which declares the character |
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encoding of the document as another character encoding is found. |
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The occurence of this warning itself does not make the document |
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non‐conforming. However, the failure of the first attempt to |
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to detect the character encoding might be the result of non‐conformance |
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of the document.</p> |
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<p>The document will be reparsed from the beginning. Some error |
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or warning might be reported again.</p> |
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<p>These are suggestions to avoid this warning:</p> |
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<ul> |
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<li>Specify <code>charset</code> parameter in the <code>Content-Type</code> |
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field in the <abbr>HTTP</abbr> header, as: |
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<pre class="HTTP example"> |
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<code>Content-Type: text/html; charset="<var>charset-name</var>"</code></pre></li> |
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<li>Put the character encoding declaration |
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(<code class="html example"><meta charset="<var>charset-name</var>"></code>) |
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just after <code class="html example"><head></code> start tag.</li> |
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<li>Use <code>UTF-8</code>.</li> |
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</ul> |
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</div> |
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</section> |
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<section id="html5-tokenize-error"> |
<section id="html5-tokenize-error"> |
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<h2>HTML5 Parse Errors in Tokenization Stage</h2> |
<h2>HTML5 Parse Errors in Tokenization Stage</h2> |
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</dl> |
</dl> |
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</div> |
</div> |
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<div class="section attribute-value-error" id="enumerated:invalid:http-equiv:content-type"><h3>Charset declaration syntax |
<div class="section attribute-value-error" id="enumerated:invalid:http-equiv:content-type"><h3>Character encoding declaration syntax |
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<code class="html bad example"><meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code> |
<code class="html bad example"><meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code> |
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is obsolete.</h3> |
is obsolete.</h3> |
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<p>Old long charset declaration syntax |
<p>Old long character encoding declaration syntax |
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<code class="html bad example"><meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code> |
<code class="html bad example"><meta http-equiv="Content-Type" content="text/html; charset=<var>charset-name</var>"></code> |
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is in use. The document is non‐conforming.</p> |
is in use. The document is non‐conforming.</p> |
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<p>The new charset declaration syntax is: |
<p>The new character encoding declaration syntax is: |
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<pre class="html example"> |
<pre class="html example"> |
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<code><meta charset="<var>charset-name</var>"></code></pre> |
<code><meta charset="<var>charset-name</var>"></code></pre> |
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</p> |
</p> |
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