Bug 225387

Summary:	scroll-padding not working correctly when scroll target is partially out of scroll port
Product:	WebKit	Reporter:	Martin Robinson <mrobinson>
Component:	Scrolling	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED DUPLICATE
Severity:	Normal	CC:	charlie.croom, simon.fraser, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Martin Robinson 2021-05-05 02:21:53 PDT

Copied from 222259:

For additional context, I believe this may occur in STP too. Please compare the behavior of Safari to Firefox on https://codepen.io/comp615/pen/bGqbrEx

Click the "right" button a few times.

In Firefox (correct), on hitting C, D, E...the scroll is moved so that the selected item aligns with scroll-padding taken into account.

In Safari, (Wrong), D does not move the scroller (incorrect because it's behind the scroll-adding)...E also does not (wholly wrong because it's not even in the scroll frame)... and from there it moves the item alternatingly correctly

Comment 1 Radar WebKit Bug Importer 2021-05-12 02:22:15 PDT

<rdar://problem/77894395>

Comment 2 Martin Robinson 2021-05-31 03:56:50 PDT

Looks like this behavior was added purposefully, but it feels like it isn't spec compliant.

*** This bug has been marked as a duplicate of bug 42593 ***