John Cage's 4'33" in the Web Audio API.

433.js

// John Cage's 4'33" with the Web Audio API
function makeSilence(e) {
    var buflen = e.outputBuffer.length;
    var dataL = e.outputBuffer.getChannelData(0);
    var dataR = e.outputBuffer.getChannelData(1);
    dataL.fill(0);
    dataR.fill(0);
}

function InitAudio() {
    var audioContext = window.AudioContext || window.webkitAudioContext;
    var audioctx = new audioContext();

    gainNode = audioctx.createGain();
    gainNode.gain.value = 0.5;
    jsNode = audioctx.createScriptProcessor(2048, 0, 2);
    jsNode.onaudioprocess = makeSilence;

    jsNode.connect(gainNode);
    gainNode.connect(audioctx.destination);
}

InitAudio();