Bug 250836

Summary:	[ResizeObserver] The initial value of the last reported size should be -1x-1
Product:	WebKit	Reporter:	cathiechen <cathiechen>
Component:	DOM	Assignee:	cathiechen <cathiechen>
Status:	RESOLVED DUPLICATE
Severity:	Normal	CC:	ahmad.saleem792, simon.fraser, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified
See Also:	https://bugs.webkit.org/show_bug.cgi?id=250900
Bug Depends on:	251015
Bug Blocks:

Description cathiechen 2023-01-19 06:32:22 PST

According to the discussion in [1], we got the conclusion:

> When first observing an element with ResizeObserver, lastReportedSize gets initialized with a -1 x -1 size

[1] https://github.com/w3c/csswg-drafts/issues/3664

Comment 1 Ahmad Saleem 2023-01-22 01:37:20 PST

Pull Request - https://github.com/WebKit/WebKit/pull/8839

Comment 2 Radar WebKit Bug Importer 2023-01-26 06:33:19 PST

<rdar://problem/104692717>

Comment 3 cathiechen 2023-02-01 02:54:45 PST

We merged the two patches together to avoid unnecessary EWS failures.

*** This bug has been marked as a duplicate of bug 251015 ***