[Webkit-unassigned] [Bug 279514] New: [css-transitions] `getKeyframes()` returns the same values for "from" and "to" with a custom property

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=279514

            Bug ID: 279514
           Summary: [css-transitions] `getKeyframes()` returns the same
                    values for "from" and "to" with a custom property
           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: graouts at webkit.org
                CC: graouts at apple.com

Created attachment 472522

  --> https://bugs.webkit.org/attachment.cgi?id=472522&action=review

Test

See the attached test case and notice how transitioning a custom property will yield a CSSTransition with the same reported value for the custom property for both the "from" and "to" keyframe. This simply can't be right, otherwise no transition would be created. It also appears that the computed style for the targeted element is incorrect, which could be the same underlying issue.

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