<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body></body>
<script>
'use strict';
function createIframe(iframe) {
return new Promise(resolve => {
iframe.src = '';
iframe.onload = () => {
resolve(iframe.contentWindow.navigator.usb);
};
document.body.appendChild(iframe);
});
}
promise_test(async(t) => {
let iframe = document.createElement('iframe');
let iframeUsbObject = await createIframe(iframe);
let devices = await iframeUsbObject.getDevices();
assert_equals(devices.length, 0);
document.body.removeChild(iframe);
// Set iframe to null to ensure that the GC cleans up as much as possible.
iframe = null;
GCController.collect();
return iframeUsbObject.getDevices()
.catch(err => assert_equals(err.name, 'NotSupportedError'));
}, 'detaching from iframe invalidates reference to the iframe USB object');
</script>