[Webkit-unassigned] [Bug 132057] New: Backtracking with current matching element support for Child fragment.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=132057

           Summary: Backtracking with current matching element support for
                    Child fragment.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: utatane.tea at gmail.com


Calculate appropriate backtracking start height from descendant.
And at first, we use it for simple optimization.
When backtracking start height equals to current height, we can simply
jump to a descendant element check phase.
And When backtracking start height equals to current height + 1, we
can simply jump to a descendant element traversing phase.

We can apply this optimization to fragments with adjacent combinators.
In the meantime, we start to implement it for a fragment with child
combinator.

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