REGRESSION (255669@main): http/tests/preload/onload_event.html is constantly failing.

[Ben Schwartz]

http/tests/preload/onload_event.html

This test is constantly failing on all platforms.

HISTORY:

https://results.webkit.org/?suite=layout-tests&test=http%2Ftests%2Fpreload%2Fonload_event.html&version_name=Big%20Sur&recent=false

TEXT DIFF:

 CONSOLE MESSAGE: <link rel=preload> must have a valid `as` value
-CONSOLE MESSAGE: <link rel=preload> must have a valid `as` value
-CONSOLE MESSAGE: <link rel=preload> must have a valid `as` value
-CONSOLE MESSAGE: <link rel=preload> must have a valid `as` value
+CONSOLE MESSAGE: <link rel=preload> cannot have the empty string as `as` value
+CONSOLE MESSAGE: <link rel=preload> cannot have the empty string as `as` value
 PASS successfullyParsed is true
 
 TEST COMPLETE

DIFF URL:

https://build.webkit.org/results/Apple-Sonoma-Release-AppleSilicon-WK2-Tests/279207@main%20(3905)/http/tests/preload/onload_event-pretty-diff.html

REPRODUCIBILITY:

I was able to reproduce this issue on macOS Sonoma (14.5, 23F79/arm64) ToT using the following command:

run-webkit-tests -v http/tests/preload/onload_event.html

REGRESSION:

This test regressed from a flaky failure to a constant failure at 255669@main.

[Radar WebKit Bug Importer]

<rdar://problem/128621665>

[Ben Schwartz]

The reason we didn't catch this failure earlier is that there was a flaky failure expectation set in bug #231328.

[EWS]

Test gardening commit 279216@main (c2ea359dff42): <https://commits.webkit.org/279216@main>

Reviewed commits have been landed. Closing PR #28992 and removing active labels.

[EWS]

Committed 279279@main (b0dd91eb97be): <https://commits.webkit.org/279279@main>

Reviewed commits have been landed. Closing PR #29061 and removing active labels.