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<!DOCTYPE html>
<title>Element ready check for child of a fullscreen iframe</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="../trusted-click.js"></script>
<div id="log"></div>
<iframe><!-- script inserts div here --></iframe>
<script>
// Verify that an iframe can itself go fullscreen, and that this doesn't
// influence the iframe ancestor test of the element ready check.
promise_test(async (t) => {
document.onfullscreenerror = t.unreached_func("fullscreenerror event");
const iframe = document.querySelector("iframe");
await Promise.all([trusted_request(iframe), fullScreenChange()]);
assert_equals(document.fullscreenElement, iframe, "fullscreen element");
// This adds the div to the iframe element itself, not to the iframe's
// contentDocument. It's done here because the HTML parser treats the
// content of iframe as a text node.
var div = document.createElement("div");
iframe.appendChild(div);
await Promise.all([
trusted_request(div, iframe.contentDocument.body),
fullScreenChange(),
]);
assert_equals(document.fullscreenElement, div);
}, "Element ready check for child of a fullscreen iframe");
</script>
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