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<!DOCTYPE html>
<title>Moving fullscreen document's body into a fullscreen iframe</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../trusted-click.js"></script>
<iframe allowfullscreen></iframe>
<script>
// wait for load event to avoid https://bugzil.la/1493878
window.onload = function() {
async_test(t => {
const iframe = document.querySelector('iframe');
const iframeDoc = iframe.contentDocument;
// Enter fullscreen for the iframe's body element.
trusted_request(t, iframeDoc.body, iframeDoc.body);
document.onfullscreenchange = t.step_func(() => {
assert_equals(document.fullscreenElement, iframe, "document's initial fullscreen element");
assert_equals(iframeDoc.fullscreenElement, iframeDoc.body, "iframe's initial fullscreen element");
// Then, move the outer document's body into the iframe. This is an unusual
// thing to do, but means that the iframe is removed from its document and
// should trigger fullscreen exit.
iframeDoc.documentElement.appendChild(document.body);
// If we exit in an orderly fashion, that's all one can ask for.
document.onfullscreenchange = t.step_func_done(() => {
assert_equals(document.fullscreenElement, null, "document's final fullscreen element");
// Because the iframe was removed, its browsing context was discarded and
// its contentDocument has become null. Because that browsing context was
// neither a descendant browsing context nor had an active document,
// nothing at all was done with it in the exit fullscreen algorithm, so
// its fullscreenElement is unchanged.
assert_equals(iframe.contentDocument, null, "iframe's content document");
assert_equals(iframeDoc.fullscreenElement, iframeDoc.body, "iframe's final fullscreen element");
});
});
});
};
</script>
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