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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>
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