[Webkit-unassigned] [Bug 231906] New: REGRESSION(r284313): ::marker accelerated animations are broken

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=231906

            Bug ID: 231906
           Summary: REGRESSION(r284313): ::marker accelerated animations
                    are broken
           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: ntim at apple.com
                CC: dino at apple.com, graouts at apple.com,
                    webkit-bug-importer at group.apple.com
            Blocks: 230008

<style>
@keyframes animate-marker {
  from {
    color: red;
    opacity: 1;
  }
  50% {
    color: green;
    opacity: 0;
  }
  to {
    color: blue;
    opacity: 1;
  }
}

::marker {
  animation: animate-marker 2s infinite; 
}
</style>

<li>Hello</li>

---

In the testcase, the marker disappears completely. Per spec, opacity should not apply at all, so the marker should be visible. But even if we did allow applying opacity, the opacity should animate properly.

regression of the `Styleable::fromRenderer` changes in bug 230008 for ::marker


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=230008
[Bug 230008] Accelerated animations on ::backdrop shouldn't affect <dialog> (backdrop-animate-002.html fails)
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