[Webkit-unassigned] [Bug 229403] New: WKWebView: Major delay on page load for animating composited values

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=229403

            Bug ID: 229403
           Summary: WKWebView: Major delay on page load for animating
                    composited values
           Product: WebKit
           Version: Other
          Hardware: Mac (Intel)
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mattgperry at gmail.com
                CC: dino at apple.com, graouts at apple.com

Open either of these links in iOS Safari, and again in iOS Chrome:

WAAPI: https://8ozd3.csb.app/
CSS `animation`: https://4bg8j.csb.app/

In Safari, the animation plays immediately on page load, as expected.

In Chrome, only the non-composited value plays immediately (`background`). `transform` and `opacity` don't animate until several seconds after page load, and even then the animation is completely out of sync with `background`.

Interestingly, the `fill: backwards` does apply both values before they start animating, out of ignorance this suggests to me that they're operating on entirely different timelines or are given different `startTime` (although logging suggests the latter isn't the case).

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