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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<title>Test for bug 1646601</title>
document.addEventListener('DOMContentLoaded', async () => {
const frame = document.createElement('iframe');
frame.srcdoc = '<html></html>';
await new Promise(resolve => frame.onload = resolve);
const subwin = frame.contentWindow;
const subcontext = subwin.AudioContext;
// Construct an AudioContext while the subdocument is fully active to start
// a MediaTrackGraph.
new subcontext();
// Unload the subdocument and wait for completion.
// This shuts down the MediaTrackGraph.
await new Promise(resolve => frame.onload = resolve);
// Test that a new AudioContext on the inactive subdocument does not attempt
// to use the shut-down MediaTrackGraph.
try { new subcontext() } catch {}