[Webkit-unassigned] [Bug 123962] New: DOMTokenList::add can add duplicated values if arguments had duplicated values

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=123962

           Summary: DOMTokenList::add can add duplicated values if
                    arguments had duplicated values
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: WebExposed
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: darin at apple.com, ap at webkit.org, sam at webkit.org,
                    arv at chromium.org, akling at apple.com


DOMTokenList::add(const Vector<String>& tokens, ExceptionCode& ec) ensures that newly added tokens are unique existing the existing tokens but don't ensure that newly added tokens are themselves unique.

e.g. element.classList.add('a b a') results in element.className being 'a b a' instead of 'a b'.

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