[Webkit-unassigned] [Bug 47673] New: large values in CSS mishandled at zoom levels 2 and above

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=47673

           Summary: large values in CSS mishandled at zoom levels 2 and
                    above
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
               URL: http://jqueryui.com/demos/button/#radio
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Minor
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rob.lifford+webkitbugzilla at gmail.com


Created an attachment (id=70741)
 --> (https://bugs.webkit.org/attachment.cgi?id=70741&action=review)
screenshot of supplied URL zoomed two times with Cmd+

Noticed this while working with the jQuery UI "buttonset" component.

This component uses JavaScript to create an alternate UI for managing a selection in a radio button group. When initialized, it assigns a class "ui-helper-hidden-accessible" to the radio button, which provides the CSS properties:

position: absolute;
left: -99999999px;

WebKit appears to mishandle the -99999999px value after zooming two or more times with Cmd+ or Ctrl+: the radio button becomes visible, even though it should still be thousands of pixels left of the left edge of the viewport.

Oddly the web inspector shows this value for the element instead of the -99999999px supplied in the stylesheet.

left: -1e+08px;

Observed this on latest Chrome and Safari on both OS X 10.6 and Windows XP.

This problem does not occur if you change the left: value to -9999px, hence the bug description's claim that the problem is WebKit mishandling large values.

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