Split out from #3821.
In §11 Resource State Pseudos we currently have the :playing and :paused pseudo-classes, which collectively address the use case of a custom "play/pause" media control which should appear as a play button or as a pause button depending on the current play state of the associated media element. In addition to the cases covered in #3821, a bunch of us (@beccahughes @mounirlamouri @padenot @jyavenard @eric-carlson @jernoble et al.) would like to mint a new pseudo-class to expose whether or not setting the volume IDL attribute would result in the element's effective media volume actually changing.
With such a pseudo-class, it would be be possible (without script) to show or hide custom volume controls based on whether or not using such a control would actually result in a user-audible change.
I have no specific proposal for a name. Bikeshedding very welcome. @AmeliaBR has several suggestions.
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