[Webkit-unassigned] [Bug 229399] New: Composited & non-composited animation iterations are unsynced

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=229399

            Bug ID: 229399
           Summary: Composited & non-composited animation iterations are
                    unsynced
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Intel)
                OS: macOS 11
            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

Created attachment 436172

  --> https://bugs.webkit.org/attachment.cgi?id=436172&action=review

Screen recording of background color iterating after transform and opacity

Visit this sandbox in Safari: https://codesandbox.io/s/waapi-webkit-iteration-timing-bug-forked-8ozd3?file=/src/index.js

This animation uses `transform`, `opacity` and `background`. This is slightly difficult to replicate but I've seen `transform` and `opacity` iterate up to two frames before or two frames after `background`. 

Expected: Values iterate start at the same time so they should *always* iterate on the same frame.

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