[Webkit-unassigned] [Bug 204448] New: Optimize dynamic media queries

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=204448

            Bug ID: 204448
           Summary: Optimize dynamic media queries
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: koivisto at iki.fi

All media queries currently force full style resolver rebuild when a query evaluation changes (for example viewport queries on window resizing or device rotation). This is very inefficient. We should treat media queries more like selectors, avoid rebuilds, and only perform the needed style recalcs.

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