Bug 235874

Summary:

Absolutely positioned element at top -9999999em disables scrolling

Product:

WebKit

Reporter:

Gabriele Romanato <gabriele>

Component:

CSS

Assignee:

Nobody <webkit-unassigned>

Status:

NEW ---

Severity:

Normal

CC:

simon.fraser, webkit-bug-importer, zalan

Priority:

Keywords:

InRadar

Version:

Safari 15

Hardware:

Mac (Intel)

OS:

macOS 12

Attachments:

Description	Flags
Miminal test case	none

Description Gabriele Romanato 2022-01-30 14:20:47 PST

Created attachment 450368 [details]
Miminal test case

Having an element negatively positioned outside the viewport, negative contextual positioning (i.e. the immediate ancestor is relatively positioned)
disables vertical scrolling on the whole document when the content of the positioned element has been hidden via the overflow property.

Minimal test case (attached):

https://gabrieleromanato.dev/test/css/safari-negative-positioning-overflow.html

Comment 1 Simon Fraser (smfr) 2022-01-31 09:41:17 PST

Looks like we hit LayoutUnit limits when computing overflow.

Comment 2 Simon Fraser (smfr) 2022-01-31 09:42:06 PST

Simple workaround is to use smaller negative offset.

Comment 3 Radar WebKit Bug Importer 2022-01-31 09:43:29 PST

<rdar://problem/88276643>