[Webkit-unassigned] [Bug 99827] New: [Shadow]: improve the performance of @host @-rules

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=99827

           Summary: [Shadow]: improve the performance of @host @-rules
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: tasak at google.com


To check whether any @host @-rules are applied to the given element, currently it is required to traverse shadow roots and to ask StyleScopeResolver about each ShadowRoot.
It would be a little slow. ElementShadow (or suitable class) should have some flag to cache whether any @host @-rules is applied to shadow host or not.

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