[Webkit-unassigned] [Bug 213547] New: Animation runs only for the first time

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=213547

            Bug ID: 213547
           Summary: Animation runs only for the first time
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tyls.alexandr at gmail.com
                CC: dino at apple.com

Spinner keyframes animation gets stuck after the first run.

You can view the bug on this page: https://app.nabij.se/empty
Click the button. The spinner should be rotating for 2.5s, but spins only when clicked for the first time.

I have noticed that it could be related to the Web Animations API. If I go to the Safari settings -> Advanced -> Experimental features and turn off "CSS Animations via Web Animations" or "Web animations" then it runs every time.

I was not able to create an isolated test case, it happens only inside my app. I did not figure out what is affecting it.

Encountered on iPhone 8, iOS 13.5.1 and also Chrome for iOS
Used frameworks and libraries: Vue.js 2.6.11, Bulma 0.9.0

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