[Webkit-unassigned] [Bug 98982] New: Setting className attribute causes slow performance

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=98982

           Summary: Setting className attribute causes slow performance
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bradavogel at gmail.com


UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/536.26.14 (KHTML, like Gecko) Version/6.0.1 Safari/536.26.14

Steps to reproduce the problem:
1. Run the attached test case.
2. View the console.

In the console you'll see:
with setting className: 342.205ms
without setting className: 1.680ms

What went wrong?
Setting the className to it same value should be a no-op. However, webkit sets the node as dirty even though the className is the same. It would be a nice performance enhancement if webkit compared the new value to the old value before setting the dirty flag to re-render the node.

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