<!DOCTYPE html>
<title>Test window.top</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/utils.js"></script>
<script src="resources/utils.js"></script>
<body>
<script>
promise_test(async () => {
const window_top_key = token();
const window_top_ack_key = token();
attachFencedFrame(generateURL("resources/window-top-inner.html",
[window_top_key, window_top_ack_key, "not nested"]));
// Get the result for the top-level fenced frame.
const fenced_frame_result = await nextValueFromServer(window_top_key);
assert_equals(fenced_frame_result, "pass: fenced frame", "The top-level " +
"fenced frame has the right value for " +
"`window.top`");
// Write an ACK, so that the fenced frame knows it can send message over the
// `window_top_key` channel again.
writeValueToServer(window_top_ack_key, "ACK");
// Get the result for the iframe inside the fenced frame.
const iframe_in_fenced_frame_result = await nextValueFromServer(window_top_key);
assert_equals(iframe_in_fenced_frame_result, "pass: fenced frame > iframe",
"The iframe inside the top-level fenced frame has the right " +
"value for `window.top`");
writeValueToServer(window_top_ack_key, "ACK");
// Get the result for the nested fenced frame.
const nested_fenced_frame_result = await nextValueFromServer(window_top_key);
assert_equals(nested_fenced_frame_result, "pass: fenced frame > fenced frame",
"The nested fenced frame inside the top-level fenced frame " +
"has the right value for `window.top`");
}, "window.top");
</script>
</body>
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