235874 2022-01-30 14:20:47 -0800 Absolutely positioned element at top -9999999em disables scrolling 2022-02-02 09:30:25 -0800 1 1 1 Unclassified WebKit CSS Safari 15 Mac (Intel) macOS 12 NEW InRadar P2 Normal --- 1 gabriele webkit-unassigned simon.fraser webkit-bug-importer zalan oldest_to_newest 1835405 0 450368 gabriele 2022-01-30 14:20:47 -0800 Created attachment 450368 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 1835560 1 simon.fraser 2022-01-31 09:41:17 -0800 Looks like we hit LayoutUnit limits when computing overflow. 1835564 2 simon.fraser 2022-01-31 09:42:06 -0800 Simple workaround is to use smaller negative offset. 1835566 3 webkit-bug-importer 2022-01-31 09:43:29 -0800 <rdar://problem/88276643> 450368 2022-01-30 14:20:47 -0800 2022-01-30 14:20:47 -0800 Miminal test case safari-negative-positioning-overflow.html text/html 7372 gabriele PCFET0NUWVBFIGh0bWw+CjxodG1sIGxhbmc9ImVuIj4KPGhlYWQ+Cjx0aXRsZT5TYWZhcmk6IG5l Z2F0aXZlIGFic29sdXRlIHBvc2l0aW9uaW5nIGFuZCBvdmVyZmxvdzwvdGl0bGU+CjxtZXRhIGNo YXJzZXQ9InV0Zi04Ij4KPG1ldGEgbmFtZT0iZGVzY3JpcHRpb24iIGNvbnRlbnQ9IllvdSBzaG91 bGQgYmUgYWJsZSB0byBzY3JvbGwgdG8gdGhlIGJvdHRvbSBvZiB0aGlzIHBhZ2UuIj4KPHN0eWxl IHR5cGU9InRleHQvY3NzIiBtZWRpYT0ic2NyZWVuIj4KYm9keSB7CiAgICBtYXgtd2lkdGg6IDQw 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