<!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>

