Bug 279998

Summary:	REGRESSION (iOS 18): svh and lvh are incorrect on iOS in third party browsers
Product:	WebKit	Reporter:	Jesper van den Ende <jespertheend>
Component:	CSS	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	augus.dupin, formularsumo, ik, koivisto, webkit-bug-importer, webkit-bugzilla
Priority:	P2	Keywords:	InRadar
Version:	Safari 18
Hardware:	iPhone / iPad
OS:	iOS 18

Description Jesper van den Ende 2024-09-19 11:26:08 PDT

Since updating to iOS 18, dynamic viewport units are displaying incorrectly.

To reproduce, visit https://10svh-10dvh-10lvh.glitch.me/ in a third party browser on iOS 18.
Observe that the three green bars are all the same height.
The expected result should be that svh and lvh have a different size and don't resize when scrolling.
In safari it still seems to work as expected, only third party browsers are affected.

Comment 1 Radar WebKit Bug Importer 2024-09-20 17:01:29 PDT

<rdar://problem/136394949>