chromium/third_party/blink/web_tests/external/wpt/webvtt/parsing/file-parsing/support/signature-timings.test

signature, timings
<link rel="help" href="https://w3c.github.io/webvtt/#webvtt-parser-algorithm">

assert_equals(cues.length, 0);

===
WEBVTT 00:00:00.000 --> 00:00:01.000
text