Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
The sysexEnabled read-only property of the MIDIAccess interface indicates whether system exclusive support is enabled on the current MIDIAccess instance.
A boolean value.
The Navigator.requestMIDIAccess() method returns a promise that resolves with a MIDIAccess object. Printing the value of sysexEnabled to the console returns a boolean value, which is true if system exclusive support is enabled.
navigator.requestMIDIAccess().then((access) => {
console.log(access.sysexEnabled);
});