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

WEBVTT
Cue alignment may be start, middle, or end (default is middle).

1
00:00:00.000 --> 00:00:30.500 align:start
Bear is Coming!!!!!
Start align.

2
00:00:31.000 --> 00:01:00.500 align:middle
I said Bear is coming!!!!
Middle align.

3
00:01:01.000 --> 00:02:00.500 align:end
I said Bear is coming now!!!!
End align.

4
00:02:01.000 --> 100:20:00.500
I said Bear is coming now!!!!
Default is middle alignment.