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Test Info: Warnings

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
async_test(t => {
let iframe = document.createElement('iframe');
let html = "<canvas id='canvas' width=10 height=10 />";
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');
// Creation of the ImageCapture object (as part of the MediaStreamTrack)
// should be safe even if the frame is detached.
}, 'MediaStreamTrack can be obtained from a detached frame');