[Webkit-unassigned] [Bug 70788] New: [MutationObservers] Implement subtree observation of transiently disconnected nodes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=70788

           Summary: [MutationObservers] Implement subtree observation of
                    transiently disconnected nodes
           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
            Blocks: 68729


>From the public-webapps webkit/mozilla proposal: 

Subtree Observation
If the subtree option is requested during registration, the observer
is delivered mutations which occur to a set of observed nodes which is
computed as follows:

- At the time of registration, the set includes |target| and all
descendant nodes
- At any point, if a node becomes a descendant of |target|, it is
synchronously added to the observed set
- Immediately before delivering all pending MutationRecords to the
observer, all nodes which are no longer descendants of |target| are
removed from the observed set.

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