[Bug 24028] New: Element.matches("!invalid!") should throw SyntaxError, not TypeError

https://www.w3.org/Bugs/Public/show_bug.cgi?id=24028

            Bug ID: 24028
           Summary: Element.matches("!invalid!") should throw SyntaxError,
                    not TypeError
           Product: WebAppsWG
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DOM
          Assignee: [email protected]
          Reporter: [email protected]
        QA Contact: [email protected]
                CC: [email protected], [email protected]

http://dom.spec.whatwg.org/#evaluate-a-selectors-string

All tested *MatchesSelector() implementations throw a SyntaxError when parsing
fails, but the spec requires TypeError.

SyntaxError seems more reasonable here, so change the spec to match reality?

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