[Bug 9107] New: Incorrectly reports validity for various illegal pseudo-element usages

http://www.w3.org/Bugs/Public/show_bug.cgi?id=9107

           Summary: Incorrectly reports validity for various illegal pseudo-
                    element usages
           Product: CSSValidator
           Version: CSS Validator
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: CSS 2.1
        AssignedTo: dave.null@w3.org
        ReportedBy: cecil@cecilward.com
         QAContact: www-validator-cvs@w3.org


The validator IMHO incorrectly reports validity for the following CSS 2.1
fragments (direct input entered)

Case #1 :
        a:first-line:first-line {}

Case #2 :
        a:first-line:lang(en) {}

Case #3 :
        a:first-line[attr] {}

Case #4 :
        a:first-line elem {}


According to the CSS2.1 grammar in appendix G, pretty much anything goes in
respect of pseudo-element placement, so if the appendix G interpretation is
accepted then the validator is correct in reporting each of the above as valid.

However, according to CSS2.1 section 5.2
(http://www.w3.org/TR/CSS2/selector.html#pattern-matching ) :
        "One pseudo-element may be appended to the last simple selector in a
chain, .."

My interpretation of this is (a) I take the word "appended" to mean what it
says, so a pseudo-element may only be in rightmost position. I assume that (b)
zero or one pseudo elements may be present, and no more, and that (c) only the
rightmost simple selector may have a pseudo-element.

So case #1 should fail because of my rules (a) and (b), case #2 and #3 should
fail under (a), case #4 under (c).


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Received on Sunday, 21 February 2010 16:28:56 UTC