WEBVTT
Region: id=foo width=40% lines=3 regionanchor=0%,100% viewportanchor=10%,90% scroll=up
Region: id=bar width=40% lines=3 regionanchor=100%,100% viewportanchor=90%,90% scroll=up

00:00:00.000 --> 00:00:01.000 region:foo
text0

00:00:00.000 --> 00:00:01.000 region:bar
text1