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[selectors-4] Canonicalize into extlang form prior to :lang() matching #4212

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Merged
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Mar 6, 2024
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[selectors-4] Canonicalize into extlang form prior to :lang() matching #4212

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[selectors-4] Canonicalize into extlang form prior to :lang() matching
frivoal Aug 17, 2019
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Merge branch 'main' into lang-canonicalization
svgeesus Mar 6, 2024
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23 changes: 13 additions & 10 deletions selectors-4/Overview.bs
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Expand Up @@ -27,7 +27,7 @@ At Risk: the column combinator
At Risk: [=user action pseudo-classes=] applying to non-[=tree-abiding=] [=pseudo-elements=]
At Risk: the '':blank'' pseudo-class
Ignored Terms: function token, Document, DocumentFragment, math, h1, shadow tree, querySelector(), quirks mode, button, a, span, object, p, div, q, area, link, label, input, html, em, li, ol, pre, CSS Value Definition Syntax
Ignored Vars: identifier, extended filtering, i
Ignored Vars: identifier, i 







    

    

    

  
    spec:css-values-4; type:dfn; text:identifier






      

    
          
            
          
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    @@ -1977,21 +1977,24 @@ The Language Pseudo-class: '':lang()''
  


    

    

    

  
    		e.g. '':lang(\*-Latn)'' or '':lang("*-Latn")''.)






    

    

    

  
    







    

    

    

  
    	Note: The content language of an element is defined by the document language.






    

    

    

  
    	For example, in HTML [[HTML5]], the content language is determined






    

    

    

  
    







    

    

    

  
      For example, in HTML [[HTML5]], the content language is determined






    

    

    

  
    	by a combination of the lang attribute,






    

    

    

  
    	information from meta elements,






    

    

    

  
    	and possibly also the protocol (e.g. from HTTP headers).






    

    

    

  
    	XML languages can use the xml:lang attribute






    

    

    

  
    	to indicate language information for an element. [[XML10]]






    

    

    

  
    







    

    

    

  
    	An element's content language matches a language range if,






    

    

    

  
    	when represented in BCP 47 syntax [[BCP47]],






    

    

    

  
    	it matches that language range in an extended filtering






    

    

    

  
    	operation per [[RFC4647]] Matching of Language Tags (section 3.3.2).






    

    

    

  
    	For this purpose, a wildcard [=language range=] ("*") does not match






    

    

    

  
    	elements whose language is not tagged (e.g. lang=""),






    

    

    

  
    	but does match elements whose language is tagged as undetermined (lang=und).






    

    

    

  
    	The matching is performed [=ASCII case-insensitively=].






    

    

    

  
    	The element's content language matches a language range if






    

    

    

  
    	its content language, as represented in BCP 47 syntax,






    

    

    

  
    	matches the given language range in an extended filtering






    

    

    

  
    	operation per [[!RFC4647]] Matching of Language Tags (section 3.3.2).






    

    

    

  
    	Both the [=content language=] and the [=language range=]






    

    

    

  
    	must be canonicalized






    

    

    

  
    	and converted to extlang form as per section 4.5 of [[!RFC5646]]






    

    

    

  
    	prior to the extended filtering operation.






    

    

    

  
    	The matching is performed case-insensitively within the ASCII range.






    

    

    

  
    







    

    

    

  
    	The language range does not need to be a valid language code to






    

    

    

  
    	perform this comparison.






    

    

    

  
    







  

    
          
            
          
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