The currently set volume is not announced

[Michael-Detmers]

If the volume control is operated with the arrow keys while the mute button is focused, the current value will not be output or announced by screen readers, for example.
This is especially a problem if you want to adjust the volume before pressing play, for example.

For this purpose, for example, the aria-valuetext value of mejs__volume-slider could be copied to a live status region.