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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
async_test(t => {
let iframe = document.createElement('iframe');
let html = "<canvas id='canvas' width=10 height=10></canvas>";
iframe.srcdoc = html;
iframe.onload = t.step_func_done(() => {
// This detaches the frame while retaining a reference to an
// HTMLCanvasElement from it.
let canvas = iframe.contentWindow.document.getElementById('canvas');
document.body.removeChild(iframe);
// Creation of the ImageCapture object (as part of the MediaStreamTrack)
// should be safe even if the frame is detached.
canvas.captureStream();
});
document.body.appendChild(iframe);
}, 'MediaStreamTrack can be obtained from a detached frame');
</script>
</body>
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