SoundJS not stopping sounds on focus shift in iOS11

[magtastic]

Seems like in iOS11, the document has no webkitHidden variable or something.

This causes games in iPhones with iOS11 to keep playing sounds after the document is hidden and/or focus is shifted.

This was working fine in iOS10.

[lannymcnie]

Where is webkitHidden used? It is not in the SoundJS source. SoundJS does not handle focus events on iOS (or elsewhere) to stop audio.