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<!DOCTYPE html>
<body>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
function get_response() {
return new Promise(resolve => {
window.addEventListener('message', e => {
resolve(e.data);
}, { once: true });
});
}
promise_test(async () => {
// - opaque-origin-history1.html navigates itself to opaque-origin-history2.html.
// - opaque-origin-history2.html call window.history.back() to navigate
// back to opaque-origin-history1.html
// - opaque-origin-history1.html should still be able to access fullscreen
// feature after the history.back() navigation.
const iframe = document.createElement('iframe');
// sandbox iframe so that it has opaque origin.
iframe.sandbox = 'allow-scripts';
iframe.src = 'resources/opaque-origin-history1.sub.https.html';
iframe.allow = "fullscreen 'src'";
document.body.appendChild(iframe);
assert_equals(
await get_response(),
'fullscreen enabled in opaque-origin-history1.html',
'iframe should be able to access fullscreen.'
);
iframe.contentWindow.postMessage('redirect', '*');
assert_equals(
await get_response(),
'fullscreen enabled in opaque-origin-history1.html',
'iframe should still be able to access fullscreen after history.back() navigation.'
);
});
</script>
</body>
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