Support info for the <track> element

[mryand]

Note that this is not the same as the "Video Tracks" support already in caniuse. This is a request for information about support for text tracks via the element, as described here:

http://www.html5rocks.com/en/tutorials/track/basics/

[Schweinepriester]

Available via MDN now: https://caniuse.com/?search=track+element

• https://caniuse.com/mdn-html_elements_track