[Webkit-unassigned] [Bug 181242] New: Animation-duration doesn't evaluate changes to a CSS Custom Property via JavaScript in real time

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Jan 3 06:40:06 PST 2018


https://bugs.webkit.org/show_bug.cgi?id=181242

            Bug ID: 181242
           Summary: Animation-duration doesn't evaluate changes to a CSS
                    Custom Property via JavaScript in real time
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: contact at benfrain.com

When specifying a `animation-duration` value as a CSS Custom Property, a change of that value via the JS API does not update the UI unless tabs/applications are switched.

Current behaviour:
The animation only updates when a user switches focus from Safari to something else and back 

Expected behaviour:
The animation should 're-time' based upon the new value as it is updated.

Further information:
https://benfrain.com/can-css-custom-properties-update-animation-durations-on-the-fly/

Reduction:
https://codepen.io/benfrain/pen/LeRMvm

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