[Webkit-unassigned] [Bug 255328] New: [GTK][WPE] CSS 3D animations/transforms are glitchy in some cases

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255328

            Bug ID: 255328
           Summary: [GTK][WPE] CSS 3D animations/transforms are glitchy in
                    some cases
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aperez at igalia.com
                CC: dino at apple.com, graouts at apple.com

Created attachment 465864

  --> https://bugs.webkit.org/attachment.cgi?id=465864&action=review

Screenshot, side by side comparison with Chromium

The following page has an animation of the solar system that uses CSS 3D
transforms and animation:

  https://clixplatform.tiss.edu/softwares/Tools/Solar_System_Animation/en/

The WPE and GTK ports show some of the elements glitching, with some of their
parts missing (transparent, mostyl visible on planets) and opacity missing or
wrongly applied (mostly noticeable on the text label for Earth as it circles
around the sun).

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