partial interface Navigator {
    void requestMIDIAccess (SuccessCallback successCallback, optional ErrorCallback errorCallback, optional boolean systemExclusiveSupportRequested = false );
};


callback SuccessCallback = void (MIDIAccess access, boolean systemExclusiveAllowed);


callback ErrorCallback = void (DOMError error);


interface MIDIAccess : EventTarget {
    sequence<MIDIPort> getInputs ();
    sequence<MIDIPort> getOutputs ();
    MIDIInput          getInput (MIDIPort or DOMString or short target);
    MIDIOutput         getOutput (MIDIPort or DOMString or short target);
                attribute EventHandler onconnect;
                attribute EventHandler ondisconnect;
};


enum MIDIPortType {
    "input",
    "output"
};


interface MIDIPort : EventTarget {
    readonly    attribute DOMString    id;
    readonly    attribute DOMString?   manufacturer;
    readonly    attribute DOMString?   name;
    readonly    attribute MIDIPortType type;
    readonly    attribute DOMString?   version;
                attribute EventHandler ondisconnect;
};


interface MIDIInput : MIDIPort {
                attribute EventHandler onmessage;
};


interface MIDIOutput : MIDIPort {
    void send (sequence<octet> data, optional double timestamp);
};


interface MIDIMessageEvent : Event {
    readonly    attribute double     receivedTime;
    readonly    attribute Uint8Array data;
};


interface MIDIConnectionEvent : Event {
    readonly    attribute MIDIPort port;
};