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Test Info:
<!DOCTYPE html>
<html class='reftest-wait'>
<head>
<script>
document.addEventListener('DOMContentLoaded', async () => {
const canvas = document.createElement('canvas')
canvas.height = 27530
const context = canvas.getContext('2d')
context.strokeRect(5, 5, canvas.width - 5, canvas.height - 5)
const stream = canvas.captureStream()
const recorder = new MediaRecorder(stream)
recorder.start()
const stopped = new Promise(r => recorder.onstop = r)
await new Promise(r => setTimeout(r, 100))
stream.getTracks().forEach(t => t.stop())
await stopped
document.documentElement.removeAttribute("class")
})
</script>
</head>
</html>