[Webkit-unassigned] [Bug 90158] New: -webkit-user-select: none causes performance issue on large pages

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=90158

           Summary: -webkit-user-select: none causes performance issue on
                    large pages
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows XP
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rob.miles at morrisonsplc.co.uk


Created an attachment (id=149921)
 --> (https://bugs.webkit.org/attachment.cgi?id=149921&action=review)
Sample HTML file that replicates the defect

Adding the style -webkit-user-select: none to the body tag of a large page causes a significant performance issue.  Javascript event handlers take around 1-2 seconds to fire.
I have attached a sample page that demonstrates this issue.  On the sample page, click anywhere within the page to see the alert box appear after a delay.  Remove the style attribute on the body tag and refresh the page, notice that clicking now causes the alert box to appear almost instantaneously.
This problem is reproducable in both Safari 5.1.7 and Chrome 19.0.1084.56 m

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