[Webkit-unassigned] [Bug 70649] New: [MutationObservers] Implement constant-time lookup of observers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=70649

           Summary: [MutationObservers] Implement constant-time lookup of
                    observers
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rafaelw at chromium.org
                CC: darin at apple.com, sam at webkit.org,
                    dglazkov at chromium.org, rniwa at webkit.org,
                    adamk at chromium.org
            Blocks: 68729


If all observers are registered at the document-level (and the document stores this information), we can avoid having to walk up the tree to look for observers. This is likely to be a common case and worth fast-path-ing.

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