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[selectors-4] Make empty language strings match untagged elements. #6915 #8011

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Nov 7, 2022
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[selectors-4] Make empty language strings match untagged elements. #6915 #8011

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7 changes: 7 additions & 0 deletions selectors-4/Overview.bs
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Expand Up @@ -1915,10 +1915,17 @@ The Language Pseudo-class: '':lang()''</h3>
when represented in BCP 47 syntax [[BCP47]],
it matches that <a>language range</a> in an <var>extended filtering</var>
operation per [[RFC4647]] <cite>Matching of Language Tags</cite> (section 3.3.2).
For this purpose, a wildcard [=language range=] (<code>"*"</code>) does not match
elements whose language is not tagged (e.g. <code>lang=""</code>),
but does match elements whose language is tagged as undetermined (<code>lang=und</code>).
The matching is performed [=ASCII case-insensitively=].
The <a>language range</a> does not need to be a valid language code to
perform this comparison.

A [=language range=] consisting of an empty string
('':lang("")'')
matches (only) elements whose language is not tagged.

Note: It is recommended that documents and protocols
indicate language using codes from [[BCP47]] or its successor,
and in the case of XML-based formats, by means of <code>xml:lang</code> attributes. [[XML10]]
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