WEBVTT

NOTE No API for accessing region ids, so using lines to uniquely identify regions

REGION
id:foo
id:bar
lines:1

REGION
id:bar id:foo
lines:2

REGION
id:id
id: foo
id :bar
lines:3

REGION
id:
lines:4

00:00:00.000 --> 00:00:01.000 region:foo
valid

00:00:00.000 --> 00:00:01.000 region:bar
valid

00:00:00.000 --> 00:00:01.000 region:id
valid

00:00:00.000 --> 00:00:01.000 region:
valid
