src/third_party/web_platform_tests/webvtt/rendering/cues-with-video/processing-model/support/line_percent_and_integer_overlap.vtt

WEBVTT

00:00:00.000 --> 00:00:10.000 line:45%
This is a test subtitle

00:00:00.000 --> 00:00:10.000 line:9
This is another test subtitle