Captions do not change in size with ctrl++/ctrl+- (desktop browsers)

[apadhye]

We cannot use keyboard options to increase/decrease font size.

STR:

• Create a video with captions.
• Play the video and enable captions.
• Use Ctrl+ or Ctrl- (Cmd+ and Cmd- if you are on a Mac) to increase/decrease browser text size.

Expected:

• Caption size increases or decreases along with the rest of the browser text.

Actual:

• Caption size remains the same.

[RickEyre]

Hey @apadhye, thanks for your feedback. I think this might be a bug that better belongs on bugzilla. While parts of this issue most likely do touch this repo, most of it would probably be on the browser side.

[gkatsev]

We're seeing this particularly in videojs where we're using vttjs to implement captions. We weren't sure whether vttjs could do anything about it.

[RickEyre]

@gkatsev yeah, I'm unsure right now on what would be causing this. I don't really have much time to investigate either. I'd be curious to know how the browser effects the size change when hitting +/-. That would tell us a lot about if vtt.js could do anything about it.

vtt.js calculates the size of the cue boxes and font via a relative percentage of the containing box. So I would think it would pick up on it.. something is getting lost in the mix though.