Property "muted" for <audio> and <video>

[fend25]

Hello!

Now <audio> and <video> components provide 3 two-way binding tags: currentTime, paused and volume.

I'd like to send a PR with the muted property.

This property is not the same as setting volume to 0. It has slightly different mechanics and in some cases is really needed (i.e. modern browsers disallow autoplay non-muted video. setting volume to 0 doesnt work).
Also it is useful in some scenarios (i. e. if we want to make volume controller like youtube one, where you can mute sound by the button, and the volume slider is still visible and showing volume level, which would be actual after unmutting)

Is this PR welcome?

PS. commit is already in my fork: fend25@a37ee81

(there are some unrelated linting fixes - I did the linting)

[Conduitry]

Yes please! A PR for bind:muted would be appreciated! Please also include in the PR an update to https://github.com/sveltejs/svelte/blob/master/site/content/docs/02-template-syntax.md to mention the new binding.

[subz390]

Hi guys, may I enquire about the state of this PR @fend25 or @Conduitry as I'd love to have the use of bind:muted in my video component. Many thanks.

[arxpoetica]

Draft PR for this, but it needs some fixing before it's good. #4690

[az67128]

Hello. Is there any progress on this PR?
Docs referes to muted binding
But I am getting an error

ValidationError: 'muted' is not a valid binding

[Conduitry]

Sorry, I guess this means we've been officially bitten by not having a separate branch to deploy docs from. This feature is in master, as are its docs, but it hasn't been released yet. The docs just came along when I was deploying some other documentation fixes from master. This should be released soon.

[Conduitry]

This has been released in 3.23.0.