test_bug1553262.html

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<!DOCTYPE HTML>

<html>

<head>

<meta charset="utf-8">

<title>Bug 1553262</title>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" href="/tests/SimpleTest/test.css"/>

</head>

<body>

<script>

  const canvas = document.createElement('canvas')

  const context = canvas.getContext('2d')

  const video = document.createElement('video')

  const source = new AudioContext().createMediaElementSource(video)

  const stream = canvas.captureStream()

  const xhr = new XMLHttpRequest()

  context.rect(256, -32768, 16, 16)

  video.srcObject = stream

  for (let i = 0; i < 16; i++) {

    xhr.open('P', '', false)

    xhr.send()

  video.srcObject = stream

  ok(true, "success")

</script>

</body>

</html>