Fix VTTRegion support

[avelad]

Have you read the FAQ and checked for duplicate issues: Yes

What version of Shaka Player are you using: 2.2.8

Can you reproduce the issue with our latest release version: Yes

Can you reproduce the issue with the latest code from master: Yes

Are you using the demo app or your own custom app: demo app

What browser and OS are you using: Chrome 63, Ubuntu 17.10

What did you do?
Load Angel One and enable the subtitles

What did you expect to happen?
Subtitles are shown correctly

What actually happened?

[joeyparrish]

I am also using Chrome 63 on Linux, but I do not see the same results as you. For me, the subtitles are at the bottom, as they should be. Are you seeing this consistently across machines and OSes? Is it possible that you have some customized style sheet for cues installed in the browser?

[avelad]

It's very strange, with other pages work (using native text track)

[avelad]

In Firefox & Opera work as expected in the same machine.

[joeyparrish]

Very strange. We are using a native TextTrack as well, but instead of setting src='sub.vtt', we are using the addCue() API on the TextTrack. It's not clear to me why it would display differently on your Linux machine than mine, with the same browser & version.

Do you have any extensions installed which could be affecting it? Do you get the same results in incognito mode?

[avelad]

It is something related to my browser.

[joeyparrish]

@avelad, can you please share what the cause of the issue was? I'm sure this could be useful to others in the future if they run into similar symptoms.

[avelad]

I reset all experiments in chrome://flags/, and now it works!

[joeyparrish]

Interesting. I would like to figure out what flag it is. It could be a bug in some experimental thing in Chrome, or it could be a bug in Shaka Player that is only activated by some future-looking feature.