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Test Info: Errors

<html class="reftest-wait">
<head>
<script>
async function start () {
for (let i = 0; i < 30; ++i) {
SpecialPowers.wrap(document).notifyUserGestureActivation();
const s = await navigator.mediaDevices.getDisplayMedia({video: {frameRate: 60}});
const [t] = s.getTracks();
await t.applyConstraints({frameRate: 59}); // reconfigures backend
await new Promise(r => setTimeout(r, i));
t.stop();
}
document.documentElement.removeAttribute("class")
}
document.addEventListener('DOMContentLoaded', start)
</script>
</head>
</html>