[MacOS Debug] media/modern-media-controls/overflow-support/chapters.html is a flaky failure and timeout

• Component: New Bugs
• Status: NEW ---

[Amir Mark Jr]

media/modern-media-controls/overflow-support/chapters.html

Is a flaky failure and timeout on both BigSur Debug and Catalina Debug.

History:

https://results.webkit.org/?suite=layout-tests&test=media%2Fmodern-media-controls%2Foverflow-support%2Fchapters.html


Text Diff:

--- /Volumes/Data/worker/bigsur-debug-tests-wk2/build/layout-test-results/media/modern-media-controls/overflow-support/chapters-expected.txt
+++ /Volumes/Data/worker/bigsur-debug-tests-wk2/build/layout-test-results/media/modern-media-controls/overflow-support/chapters-actual.txt
@@ -1,15 +1,5 @@
-Testing the OverflowSupport behavior for Playback Speed.
-
-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
-
-
-PASS shadowRoot.querySelector('button.overflow') became different from null
-PASS shadowRoot.querySelector('button.overflow').getBoundingClientRect().width became different from 0
-PASS media.textTracks[0].mode became different from 'disabled'
-Tapping overflow button...
-Selecting first chapter cue...
-PASS media.currentTime >= 5 became true
-PASS successfullyParsed is true
+CONSOLE MESSAGE: SyntaxError: Unexpected token '<<'
+FAIL successfullyParsed should be true (of type boolean). Was undefined (of type undefined).
 
 TEST COMPLETE

[Radar WebKit Bug Importer]

<rdar://problem/79370477>

[Amir Mark Jr]

This test was initially timing out consistently when introduced. Then around r278674 appeared to only become flaky timing out and failing on Big Sur and Catalina Debug

[Alexey Proskuryakov]

This is an unusual failure mode. Where is this '<<' even coming from?