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Test Info:

<html class="reftest-wait">
<head>
<script>
async function start () {
const canvas = document.createElement('canvas')
const context = canvas.getContext('2d')
context.fillStyle = "red"
context.fillRect(0, 0, 1, 1)
const recorder = new MediaRecorder(
canvas.captureStream(), { videoBitsPerSecond: 16 })
recorder.start(100)
await new Promise(r => recorder.onstart = r)
recorder.pause()
document.documentElement.removeAttribute("class")
}
window.addEventListener('load', start)
</script>
</head>
</html>