chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/media-elements/track/track-element/resources/cue-id-error.vtt

WEBVTT
Cue identifiers cannot contain the string "-->".

-->random_id
00:00:00.000 --> 00:00:30.500
Bear is Coming!!!!!

another random identifier-->
00:00:31.000 --> 00:01:00.500
I said Bear is coming!!!!

identifier-->too
00:01:01.000 --> 00:20:00.500
I said Bear is coming now!!!!