Bug 193088 - REGRESSION (Web Animations): CSS Transition sometimes jumps back and forth between initial position and current position
Summary: REGRESSION (Web Animations): CSS Transition sometimes jumps back and forth be...
Status: RESOLVED DUPLICATE of bug 204116
Alias: None
Product: WebKit
Classification: Unclassified
Component: Animations (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2019-01-02 13:05 PST by Xidorn Quan
Modified: 2019-11-13 06:25 PST (History)
7 users (show)

See Also:

Attachments
testcase (631 bytes, text/html)
2019-01-02 13:05 PST, Xidorn Quan 		no flags Details
Test without acceleration (616 bytes, text/html)
2019-10-28 09:09 PDT, Antoine Quint 		no flags Details
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Description Xidorn Quan 2019-01-02 13:05:41 PST 
Created attachment 358197 [details]
testcase

See the attachment. When you move mouse, there should be a blue block follows the cursor with a delay. However, in Safari Technology Preview, it jumps back and forth if you move mouse continuously.

Gecko has similar bug which I reported in https://bugzilla.mozilla.org/show_bug.cgi?id=1517168 which you may be interested.

Safari 12.0.2 doesn't have this issue, so it seems like a regression between that and the preview version.
Comment 1 Radar WebKit Bug Importer 2019-01-02 14:59:31 PST 
<rdar://problem/47011758>
Comment 2 Simon Fraser (smfr) 2019-01-02 15:03:15 PST 
Only reproduces with Web Animations enabled.
Comment 3 Antoine Quint 2019-10-28 08:56:40 PDT 
This still reproduces with ToT, investigating.
Comment 4 Antoine Quint 2019-10-28 09:08:21 PDT 
Adapting the test case to use left/top doesn't reproduce the issue, so this is specific to accelerated animations.
Comment 5 Antoine Quint 2019-10-28 09:09:43 PDT 
Created attachment 382075 [details]
Test without acceleration
Comment 6 Antoine Quint 2019-10-28 09:20:06 PDT 
While it's more pronounced with Web Animations, the existing behavior with the flag off does exhibit the issue though.
Comment 7 Antoine Quint 2019-11-13 06:25:54 PST 
This is a duplicate of https://bugs.webkit.org/show_bug.cgi?id=204116.

*** This bug has been marked as a duplicate of bug 204116 ***