chromium/third_party/blink/web_tests/media/track/captions-webvtt/captions-overscan.vtt

WEBVTT
Valid vertical direction settings.

1
00:00:00.000 --> 00:00:01.000 vertical:lr line:0
Checks left margin

2
00:00:01.000 --> 00:00:02.000 vertical:lr
Checks right margin

3
00:00:02.000 --> 00:00:03.000
Checks bottom margin

4
00:00:03.000 --> 00:00:04.000 line:0
Checks top margin