Did we previously have these in IDL and implemented to do nothing? I see no WebIDL changes here, which you normally do when API support is added for methods...
Bug 1534466 Comment 12 Edit History
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Did we previously have these in IDL and implemented to do nothing? I see no WebIDL changes here, which you normally do when API support is added for methods... according to the docs we already have in place, we have had these since Firefox 59. Was that audio only?