[Webkit-unassigned] [Bug 186837] New: Animated pseudoelements in a Shadow Root get keyframes from main document

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186837

            Bug ID: 186837
           Summary: Animated pseudoelements in a Shadow Root get keyframes
                    from main document
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
               URL: https://faithful-string.glitch.me/
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rperezgamo at gmail.com

Pseudoelements (::before, ::after) generated inside a Shadow Root are not able to use CSS animation keyframes defined inside the same Shadow Root. Instead, they are able to use keyframes defined in the main document outside the Shadow Root.

Normal elements (a div, for example) inside the shadow root can use animation keyframes as expected.

This behavior is very clear in the provided URL when comparing it to Chrome or Firefox Nightly.

https://faithful-string.glitch.me/

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