[Webkit-unassigned] [Bug 100921] New: [Shadow] ShadowRoot should be able to know the existence of <content>

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=100921

           Summary: [Shadow] ShadowRoot should be able to know the
                    existence of <content>
           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: shinyak at chromium.org
            Blocks: 100451


We would like to check whether we have to invalidate distribution when element attribute is changed.
If we know the non-existence of <content>, we can skip traversing the descendants of ShadowRoot to check invalidation necessity.

Larger context is: https://bugs.webkit.org/show_bug.cgi?id=100451

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