Document playbackRates

[edemaine]

The Video.js Options Reference should mention the option playbackRates and how to use it. I only found out about it because of this StackOverflow post. (FWIW, I wrote and shared a now-very-old plugin video-speed.js which may have inspired this feature. Very happy to find this included in the modern base video.js!)

[misteroneill]

Ah, yes, it should be documented. As far as the feature is concerned, I'm pretty sure it comes from the DOM API. We'd definitely welcome a PR to the options guide, if you're feeling up for it!

[edemaine]

The DOM supports playbackRate to change/get the current playback rate, but video.js specifically supports options of {playbackRates: ...} which causes the creation of a widget to select playback rate. I'll take a stab at a PR.