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2 changes: 1 addition & 1 deletion selectors-4/Overview.bs
Original file line number Diff line number Diff line change
Expand Up @@ -2618,7 +2618,7 @@ The Language Pseudo-class: '':lang()''</h3>
must be <i>canonicalized</i>
and converted to <i>extlang form</i> as per section 4.5 of [[!RFC5646]]
prior to the <i>extended filtering</i> operation.
The matching is performed case-insensitively within the ASCII range.
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.
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