Experimental features in Firefox
nput the global beforeinput event is sent to an <input> element—or any element whose contenteditable attribute is enabled—immediately before the element's value changes. release channel version added enabled by default? nightly 74 no developer edition 74 no beta 74 no release 74 no preference name dom.input_events.beforeinput.enabled htmlmediaelement method: setsinkid() htmlmediaelement.setsinkid() allows you to set the sink id of an audio output device on an htmlmediaelement, thereby changing where the audio is being output. see bug 934425 for more details. release channel version added enabled by default? nightly 64 no developer edition 64 no ...