Bug 207687 - scrollTop change in pointermove event results flickering
Summary: scrollTop change in pointermove event results flickering
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Scrolling (show other bugs)
Version: Safari 13
Hardware: All All
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2020-02-13 04:37 PST by Roland Soos
Modified: 2020-02-17 23:40 PST (History)
5 users (show)

See Also:

Attachments
Test case (1.24 KB, text/html)
2020-02-13 04:37 PST, Roland Soos 		no flags Details
Screen record (1.82 MB, video/mp4)
2020-02-13 04:38 PST, Roland Soos 		no flags Details
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Description Roland Soos 2020-02-13 04:37:27 PST 
Created attachment 390628 [details]
Test case

Steps to reproduce:
#1 Open https://smartslider3.com/bugs/webkit/pointerscroll/
#2 hold the pointer down and move it up or down

What should happen?
The pointer movement should move the scroll up and down

What went wrong?
During the scrollTop change the screen starts to flicker
Comment 1 Roland Soos 2020-02-13 04:38:05 PST 
Created attachment 390629 [details]
Screen record
Comment 2 Radar WebKit Bug Importer 2020-02-16 18:07:52 PST 
<rdar://problem/59498307>
Comment 3 Simon Fraser (smfr) 2020-02-17 10:39:01 PST 
I can reproduce. Is it better if you use touch events?
Comment 4 Roland Soos 2020-02-17 23:40:29 PST 
Simon: It is a little bit better, but from user perspective it is as worse as with the pointer events. The only difference that the Safari top and bottom UI is not flickering.

https://smartslider3.com/bugs/webkit/pointerscroll/touch.html