Bug 210802

Summary:	IRS.gov intermittently stops scrolling suddenly
Product:	WebKit	Reporter:	tym46383
Component:	Scrolling	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	simon.fraser, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	Safari 13
Hardware:	iPhone / iPad
OS:	iOS 13

Description tym46383 2020-04-21 09:50:15 PDT

On https://irs.gov, swiping quickly to move the page up or down will sometimes abruptly stop at a random spot in the middle of the page. This doesn't seem to happen on Mac, but it is present on iPad with the latest 13.4.5 beta.

Also, if I try to grab the scrollbar and pull down, it resets to the top. However, if I'm at the bottom of the page and drag it to go up, it works as expected.

Comment 1 Radar WebKit Bug Importer 2020-04-22 15:03:28 PDT

<rdar://problem/62213022>

Comment 2 Simon Fraser (smfr) 2020-04-22 15:17:24 PDT

I can reproduce. Doesn't happen if JS is paused, so the page is probably triggering a programmatic scroll.