[Webkit-unassigned] [Bug 39924] New: Reducing page zoom causes incorrect component offset values

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=39924

           Summary: Reducing page zoom causes incorrect component offset
                    values
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.6
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: andrejohn.mas at gmail.com


Created an attachment (id=57414)
 --> (https://bugs.webkit.org/attachment.cgi?id=57414)
Test case illustrating the bug

I have run into an issue where zooming out of a page ( cmd - ) causes the element offset to become incorrect. This can have an impact on dynamic HTML which is not expecting this behaviour. Tests indicate this is a WebKit related issue, since both Safari and Chrome are impacted, while Opera and Firefox are not.

Tested on MacOS X 10.6 only.

I have attached a test case showing the issue:
  1 - open the test case
  2 - click on the button, in page, and observe displayed offset in console
  3 - zoom out at least twice (more if possible)
  4 - click on the button, in page, and observe displayed offset in console, compare to step 2

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