enum WakeLockType {
    "screen",
    "system"
};

partial interface Navigator {
    [SecureContext] Promise<WakeLock> getWakeLock(WakeLockType type);
};

[SecureContext,
 Exposed=Window]
interface WakeLock : EventTarget {
    readonly attribute WakeLockType type;
    readonly attribute boolean      active;
             attribute EventHandler onactivechange;
    WakeLockRequest createRequest();
};

[SecureContext,
 Exposed=Window]
interface WakeLockRequest {
    void cancel();
};