[Webkit-unassigned] [Bug 181755] New: [iOS] [WPE] Wrong animation speed when using CSS transform, rendering glitch

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Jan 17 11:32:02 PST 2018


https://bugs.webkit.org/show_bug.cgi?id=181755

            Bug ID: 181755
           Summary: [iOS] [WPE] Wrong animation speed when using CSS
                    transform, rendering glitch
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: steffen at deusch.me
                CC: dino at apple.com

Hello everyone,
while testing CSS transforms concerning https://bugs.webkit.org/show_bug.cgi?id=181709, I noticed another issue that you can see here:
https://s3.eu-central-1.amazonaws.com/steffend/public/webkitbug/somethingswrong.mp4
Basically, the animation plays too slowly, but the Web Inspector shows the position where the elements should be.
When reloading, the animation speed seems kind of random: https://s3.eu-central-1.amazonaws.com/steffend/public/webkitbug/speed.mp4

Page for reproduction: https://s3.eu-central-1.amazonaws.com/steffend/public/webkitbug/scrolling.html

I noticed this issue on iOS 11.2.2 and WPE master (only sometimes and when using an iframe: https://s3.eu-central-1.amazonaws.com/steffend/public/webkitbug/scrollframe.html), possibly affecting other platforms too. I couldn't reproduce it on macOS (Safari).
WPE commit 959d9b1d2555da0ce65bd0198bc509dd08e9f910 (https://github.com/WebPlatformForEmbedded/WPEWebKit).

Thanks for any help,
Steffen Deusch

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