[Webkit-unassigned] [Bug 228896] New: CSS animation timing is broken

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=228896

            Bug ID: 228896
           Summary: CSS animation timing is broken
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Intel)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: evan.exe at gmail.com

Created attachment 435129

  --> https://bugs.webkit.org/attachment.cgi?id=435129&action=review

A screen capture showing Chrome working correctly and Safari working incorrectly

Repro:

1. Visit https://esbuild.github.io/ on Chrome or Firefox
2. Notice how the progress bars move together

3. Visit https://esbuild.github.io/ on Safari
4. Notice how the progress bars move separately at different speeds

The animation is a simple linear CSS animation from left to right, and is completely broken in Safari.

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