Using the Gamepad API - Web APIs
disconnecting a gamepad when a gamepad is disconnected, and if a page has previously received data for that gamepad (e.g.
...note that disconnecting a device and then connecting a new device may reuse the previous index.

MutationObserver.takeRecords() - Web APIs
the most common use case for this is to immediately fetch all pending mutation records immediately prior to disconnecting the observer, so that any pending mutations can be processed when stopping down the observer.
... example in this example, we demonstrate how to handle any undelivered mutationrecords by calling takerecords() just before disconnecting the observer.

nsIRadioInterfaceLayer
speakerenabled bool constants call state constants constant value description call_state_unknown 0 call_state_dialing 1 call_state_alerting 2 call_state_busy 3 call_state_connecting 4 call_state_connected 5 call_state_holding 6 call_state_held 7 call_state_resuming 8 call_state_disconnecting 9 call_state_disconnected 10 call_state_incoming 11 datacall_state_unknown 0 datacall_state_connecting 1 datacall_state_connected 2 datacall_state_disconnecting 3 datacall_state_disconnected 4 call_state_ringing 2 obsolete since gecko 14.0 methods answercall() void answercall( in unsigned long callindex ); parameters callindex missing description exceptions...

Broadcast Channel API - Web APIs
a function can be run for this event with the onmessage event handler: // a handler that only logs the event to the console: bc.onmessage = function (ev) { console.log(ev); } disconnecting a channel to leave a channel, call the close() method on the object.

RTCPeerConnection: connectionstatechange event - Web APIs
pc.onconnectionstatechange = ev => { switch(pc.connectionstate) { case "new": case "checking": setonlinestatus("connecting..."); break; case "connected": setonlinestatus("online"); break; case "disconnected": setonlinestatus("disconnecting..."); break; case "closed": setonlinestatus("offline"); break; case "failed": setonlinestatus("error"); break; default: setonlinestatus("unknown"); break; } } you can also create a handler for connectionstatechange by using addeventlistener(): pc.addeventlistener("connectionstatechange", ev => { switch(pc.connectionstate) { /* ...

A simple RTCDataChannel sample - Web APIs
disconnecting the peers when the user clicks the "disconnect" button, the disconnectpeers() method previously set as that button's handler is called.

Using DTMF with WebRTC - Web APIs
disconnecting."); callerpc.getlocalstreams().foreach(function(stream) { stream.gettracks().foreach(function(track) { track.stop(); }); }); receiverpc.getlocalstreams().foreach(function(stream) { stream.gettracks().foreach(function(track) { track.stop(); }); }); audio.pause(); audio.srcobject = null; receiverpc.close(); callerpc.close(); ...

Event reference
ge script events afterscriptexecute beforescriptexecute menu events dommenuitemactive dommenuiteminactive window events close popup events popuphidden popuphiding popupshowing popupshown tab events visibilitychange battery events chargingchange chargingtimechange dischargingtimechange levelchange call events alerting busy callschanged cfstatechange connecting dialing disconnected disconnecting error held, holding incoming resuming statechange voicechange sensor events compassneedscalibration devicemotion deviceorientation orientationchange smartcard events icccardlockerror iccinfochange smartcard-insert smartcard-remove stkcommand stksessionend cardstatechange sms and ussd events delivered received sent ussdreceived frame events mozbrowserclose mozbrowsercontextmenu mozbrowsere...