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Link to IANA subtag registry, fix #429 #432

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4 changes: 3 additions & 1 deletion index.html
Expand Up @@ -4453,7 +4453,9 @@ <h2><span class="chunk">iTXt</span> International textual data</h2>
uncompressed text, encoders shall set the compression method to 0, and decoders shall ignore it.</p>

<p>The language tag is a well-formed language tag defined by [[BCP47]]. Unlike the keyword, the language tag is
case-insensitive. Subtags must appear in the IANA language subtag registry. If the language tag is empty, the language is
case-insensitive. Subtags must appear in the
<a href="https://www.iana.org/assignments/language-subtag-registry/language-subtag-registry">IANA language subtag registry</a>.
If the language tag is empty, the language is
unspecified. Examples of language tags include: <code>en</code>, <code>en-GB</code>, <code>es-419</code>,
<code>zh-Hans</code>, <code>zh-Hans-CN</code>, <code>tlh-Cyrl-AQ</code>, <code>ar-AE-u-nu-latn</code>, and
<code>x-private</code>.</p>
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