Bug 193088

Summary: REGRESSION (Web Animations): CSS Transition sometimes jumps back and forth between initial position and current position
Product: WebKit Reporter: Xidorn Quan <xidorn-webkit>
Component: AnimationsAssignee: Nobody <webkit-unassigned>
Status: RESOLVED DUPLICATE    
Severity: Normal CC: bfulgham, dino, emilio, graouts, simon.fraser, webkit-bug-importer, zalan
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
testcase
none
Test without acceleration none

Xidorn Quan
Reported 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.
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
View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2019-01-02 14:59:31 PST
<rdar://problem/47011758>
Simon Fraser (smfr)
Comment 2 2019-01-02 15:03:15 PST
Only reproduces with Web Animations enabled.
Antoine Quint
Comment 3 2019-10-28 08:56:40 PDT
This still reproduces with ToT, investigating.
Antoine Quint
Comment 4 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.
Antoine Quint
Comment 5 2019-10-28 09:09:43 PDT
Created attachment 382075 [details] Test without acceleration
Antoine Quint
Comment 6 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.
Antoine Quint
Comment 7 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 ***
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