WEBVTT

NOTE https://developer.mozilla.org/en-US/docs/Web/CSS/text-combine-upright
NOTE The `digits` values are ignored in CssParser and all assumed to be `all`

STYLE
::cue(.tcu-all) {
  text-combine-upright: all;
}
::cue(.tcu-digits) {
  text-combine-upright: digits 4;
}

00:00:00.000 --> 00:00:01.000 vertical:rl
Combine <c.tcu-all>all</c> test

00:03.000 --> 00:04.000 vertical:rl
Combine <c.tcu-digits>0004</c> digits
