[8.13.0] HTML-validation errors with the new version

[boris-petrov]

Description

I upgraded video.js to 8.13.0 and my HTML validator started giving the following warnings:

Error: Duplicate ID “captions-background-vjs_video_826_component_1399”.
Error: The “aria-labelledby” attribute must point to an element in the same document.

Indeed in the document I see multiple:

<legend id="captions-background-vjs_video_826_component_1399">

And

<select id="vjs_select_1441" aria-labelledby="captions-background-vjs_video_826_component_1399 captions-background-color-vjs_video_826_component_1399">

Reduced test case

None

Steps to reproduce

Just add video.js to any page.

Errors

No response

What version of Video.js are you using?

8.13.0

Video.js plugins used.

No response

What browser(s) including version(s) does this occur with?

Chromium

What OS(es) and version(s) does this occur with?

Linux

cc @bzizmo, @wseymour15, @CarlosVillasenor