[Webkit-unassigned] [Bug 74641] New: [MutationObservers] Add a document-level flag that can trivially be checked to avoid doing unnessary work if mutation observers absent

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=74641

           Summary: [MutationObservers] Add a document-level flag that can
                    trivially be checked to avoid doing unnessary work if
                    mutation observers absent
           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: sam at webkit.org, ojan at chromium.org, rniwa at webkit.org,
                    adamk at chromium.org
            Blocks: 68729


Right now, discovering there is no work to do still costs a number of function calls and checks. We should get this down to one function call and one check at most.

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