[Webkit-unassigned] [Bug 9115] New: Content & layers with Opacity 0 are rendered (invisibly) when they don't need to be

[bugzilla-daemon at opendarwin.org]

http://bugzilla.opendarwin.org/show_bug.cgi?id=9115

           Summary: Content & layers with Opacity 0 are rendered (invisibly)
                    when they don't need to be
           Product: WebKit
           Version: 420+ (nightly)
          Platform: Macintosh
        OS/Version: Mac OS X 10.4
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at opendarwin.org
        ReportedBy: david.carson at nokia.com


If the opacity of an object has a value of 0, we don't need to create a
transparency layer and render the contents as it is not visible. Note that a
block marked with opacity 0 is different to a block with visibility:none as
visibility can be changed by an inner element to visibility:visible, whereas a
inner can not change the restore the opacity to 1.


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