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<!DOCTYPE html>
<html>
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>
function waitForMessage(data) {
return new Promise(
resolve => {
window.addEventListener('message', e => {
if (e.data == data) {
resolve();
}
}, {once: true});
});
}
promise_test(async t => {
const w = window.open('resources/window-postmessage-open-close.html');
await waitForMessage('opened');
const nav = w.navigator;
let result = nav.getBattery();
assert_equals(typeof result, 'object');
assert_equals(result.constructor, w.Promise);
w.close();
await waitForMessage('closed');
result = nav.getBattery();
assert_equals(result, undefined);
}, 'navigator.getBattery() does not operate on a closed window');
promise_test(async t => {
const iframe = document.createElement('iframe');
iframe.srcdoc = '<html></html>';
document.body.appendChild(iframe);
const frameNav = iframe.contentWindow.navigator;
document.body.removeChild(iframe);
const battery = await frameNav.getBattery();
assert_equals(battery, undefined);
}, 'navigator.getBattery() on a detached frame does not leak or crash');
</script>
</body>
</html>
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