Bug 235368

Summary:	REGRESSION(r288197): [ macOS iOS EWS ] imported/w3c/web-platform-tests/intersection-observer/timestamp.html is a constant text failure
Product:	WebKit	Reporter:	Robert Jenner <jenner>
Component:	Layout and Rendering	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	ashvayka, bfulgham, simon.fraser, webkit-bot-watchers-bugzilla, webkit-bug-importer, zalan
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified
See Also:	https://bugs.webkit.org/show_bug.cgi?id=232387

Description Robert Jenner 2022-01-19 10:24:49 PST

imported/w3c/web-platform-tests/intersection-observer/timestamp.html

is a constant text failure on macOS, iOS, and EWS. 

HISTORY:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fintersection-observer%2Ftimestamp.html

DIFF URL:
https://build.webkit.org/results/Apple-Monterey-Release-AppleSilicon-WK2-Tests/r288197%20(1117)/imported/w3c/web-platform-tests/intersection-observer/timestamp-pretty-diff.html

DIFF TEXT:
 PASS Check that timestamps correspond to the to execution context that created the observer.
 PASS First rAF after iframe is loaded.
-PASS Generate notifications.
+FAIL Generate notifications. assert_approx_equals: Notification times are relative to the expected time origins expected 68 +/- 16 but got -38

Comment 1 Radar WebKit Bug Importer 2022-01-19 10:25:10 PST

<rdar://problem/87778542>

Comment 2 Robert Jenner 2022-01-19 10:47:54 PST

Was able to reproduce the failure at Monterey ToT using the following test

run-webkit-tests imported/w3c/web-platform-tests/intersection-observer/timestamp.html


Failure was reproducible at r288197, and not at r288196. So it appears that r288197 is a regression that broke this test:

https://trac.webkit.org/changeset/288197/webkit

Comment 3 Robert Jenner 2022-01-19 12:27:07 PST

Reverted the change that broke the test here:

https://trac.webkit.org/changeset/288229/webkit