Disable App Nap via Javascript/HTML Is there a message that could be sent in a way that at least Safari, if not other browsers, understands that tells Mavericks not to engage App Nap? I have an HTML5 pseudo-MIDI rendering app (i.e., sends individual notes out as mp3 audio) which plays back fine on Safari so long as it's in the foreground, but when focus is lost Safari/OS X does not send back sufficient calling information to play the notes at their appropriate times.  What I'd love is something like:

if (window.disallowAppNap !== undefined) {
    window.disallowAppNap = true;
}
this.playScore(callbacks = {end: function() { 
        if (window.disallowAppNap !== undefined) {
           window.disallowAppNap = false;
        }
    } }
);


From a web search, it seems that the answer to this is "Nope," but maybe someone on the OS X or Safari dev. team will see this and think, "that's a great idea!" I've looked through the Web Audio API but can't see anything connecting to App Nap.
Nope, not currently. JavaScript/HTML can't directly control App Nap in Safari or any other browser on OS X.