The close() method of the MIDIPort interface makes the access to the MIDI device connected to this MIDIPort unavailable.

If the port is successfully closed a new MIDIConnectionEvent is queued to the MIDIPort statechange and MIDIAccess statechange events, and the MIDIPort.connection property is changed to "closed".

None.

Returns a Promise which resolves once the port has been closed.

The following example shows an output port being closed.

let output = midiAccess.outputs.get(portID);
output.close(); // closes the port