[Webkit-unassigned] [Bug 75508] New: Analyze stylesheet scope to minimize style recalcs

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=75508

           Summary: Analyze stylesheet scope to minimize style recalcs
           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: koivisto at iki.fi


It is a relatively common pattern to use inline stylesheets in document body where all rules are scoped using descendant selector

<style>
#foo {...}
#foo div {...}
#foo .bar {...}
</style>

When this pattern is used it is also common that the rules only apply to elements that come after the style element. 

When the set of active stylesheets changes we invalidate and recompute the entire document style. This is very expensive.  We can detect the case above and avoid the style recalc.

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