Type alias VTTLine

VTTLine: number | "auto"

A WebVTT-defined line offset, represented by a value from the following list:
- a number: The line offset is expressed in a number of text lines or a percentage of the video viewport height or width.
- 'auto': The line offset depends on the other showing tracks.


- The semantics of the number variant are dependent on WebVTTCue.snapToLines.