[whatwg] Dynamic pseudo-classes on video/audio element to allow styling of controls

[Dimitri Glazkov]

I wonder if it makes sense to introduce a set of pseudo-classes on the
video/audio elements, each reflecting a state of the media on the
controls (playing/paused/error/etc.)? Then, we could use just CSS to
style media controls (whether native or custom), and not have to
listen to DOM events just to tweak their appearance.

:DG<