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<!DOCTYPE html>
<title>Test fenced frame sandbox adoption</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/utils.js"></script>
<script src="/common/utils.js"></script>
<body>
<script>
promise_test(async() => {
const fenced_frame_loaded_key = token();
const iframe = document.createElement('iframe');
iframe.setAttribute('sandbox', 'allow-same-origin');
document.body.append(iframe);
const inner_document = iframe.contentDocument;
const fenced_frame = inner_document.createElement('fencedframe');
// The `inner_document` is not suitable to host a fenced frame because its
// sandbox flags are too strict.
inner_document.body.append(fenced_frame);
// Per https://dom.spec.whatwg.org/#concept-node-append, this will adopt the
// inner fenced frame into the outer (main frame) document.
document.body.append(fenced_frame);
fenced_frame.config =
new FencedFrameConfig(generateURL(
'resources/fenced-frame-loaded.html', [fenced_frame_loaded_key]));
const response = await nextValueFromServer(fenced_frame_loaded_key);
assert_equals(response, "fenced frame loaded",
"The inner frame should be loaded.");
}, "Adopting a fenced frame from a too-strict document to a suitable " +
"document leaves the frame in a functional state");
</script>
</body>
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