LayoutTests/webaudio/getOutputTimestamp.html

<DOCTYPE html>
<html>
<body>
<script src="../resources/js-test.js"></script>
<script>
description("Validate the value returned by AudioContext.getOutputTimestamp()");
jsTestIsAsync = true;

const audioContext = new AudioContext();
const gainNode = new GainNode(audioContext, { gain: 0.01 });
const oscillatorNode = new OscillatorNode(audioContext);

oscillatorNode.connect(gainNode).connect(audioContext.destination);
oscillatorNode.start();

handle = setInterval(() => {
    if (audioContext.currentTime < 0.100)
        return;
    clearInterval(handle);

    contextTime = audioContext.getOutputTimestamp().contextTime;
    shouldBeTrue("contextTime > 0.090");
    shouldBeTrue("contextTime <= audioContext.currentTime");
    finishJSTest();
}, 10);
</script>
</body>
</html>