[Webkit-unassigned] [Bug 82777] New: Subpixel antialiasing missing in some elements that overlay a graphics accelerated element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=82777

           Summary: Subpixel antialiasing missing in some elements that
                    overlay a graphics accelerated element
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Text
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: timehat at gmail.com


Created an attachment (id=134875)
 --> (https://bugs.webkit.org/attachment.cgi?id=134875&action=review)
Example file

In the attached example, the <h1> ("Page Title") tag is graphics-accelerated ("-webkit-transform: transform3d(0,0,0)").  The dialog <div> overlaps the <h1> tag (made visible with an semi-transparent background).  The text inside the <h2> tag (which is inside the dialog <div>) does not have any sub-pixel font smoothing.

Adding a background-color to the <h2> tag will enable sub-pixel antialiasing again.  It seems this shouldn't be necessary since the "dialog-content" <div> already has an opaque background color.

Changing the "top: 5%" to "top: 15%" (maybe higher, depending on window size...) on the "dialog" <div> will also re-enable sub-pixel antialiasing (since that div will no longer overlay the graphics-accelerated <h1> tag.


Seeing this in Safari on Mac OS X Snow Leopard [Version 5.1.4 (6534.54.16)], Chrome on Mac OS X Snow Leopard [17.0.963.83], Chrome on Windows 7 [18.0.1025.142 m].

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