function beep() {
var context = new AudioContext();
var oscillator = context.createOscillator();
oscillator.type = "sine";
oscillator.frequency.value = 800;
oscillator.connect(context.destination);
oscillator.start();
// Beep for 500 milliseconds
setTimeout(function () {
oscillator.stop();
}, 500);
}
beep();
// See source for a parametrized sound