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async_test(t => {
const frame = document.body.appendChild(document.createElement("iframe"));
t.add_cleanup(() => { frame.remove(); });
const originalHTMLElement = frame.contentDocument.documentElement;
assert_equals(originalHTMLElement.localName, "html");
const observer = new frame.contentWindow.MutationObserver(t.step_func_done(records => {
// Even though we passed `subtree: true` to observer.observe, due to the
// fact that "replace all" algorithm removes children with the "suppress
// observers flag" set, we still only get the html element as the sole
// removed node.
assert_equals(records.length, 1);
assert_equals(records[0].type, "childList");
assert_equals(records[0].target, frame.contentDocument);
assert_array_equals(records[0].addedNodes, []);
assert_array_equals(records[0].removedNodes, [originalHTMLElement]);
}));
observer.observe(frame.contentDocument, { childList: true, subtree: true });
assert_equals(frame.contentDocument.open(), frame.contentDocument);
}, "document.open() should inform mutation observer of node removal");
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