[Webkit-unassigned] [Bug 89389] New: Hit testing on a big table with overflow: hidden cells is slow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=89389

           Summary: Hit testing on a big table with overflow: hidden cells
                    is slow
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jchaffraix at webkit.org
                CC: simon.fraser at apple.com, jamesr at chromium.org
            Blocks: 75001


Seen on the benchmark: http://dglazkov.github.com/performance-tests/biggrid.html. If you toggle overflow: hidden and start clicking on a cell or selecting some text on the table, it takes more time that without overflow: hidden (for example by looking at the WebInspector timeline). The difference in time depends on the size of table. On a 10,000 * 100 table, it's nearly instantaneous to hit test without overflow: hidden but it takes in the order of a second if you add overflow: hidden.

This is very similar to bug 75001 except that bug 75001 covers the painting and this bug is about hit testing.

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