[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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