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chromium/third_party/blink/web_tests/dom/mutation-event-tests/dom/node/DOMNodeRemovedEvent.html 

<!DOCTYPE html>
<html>
<head>
<script src="../../../../resources/js-test.js"></script>
</head>
<body>
<script>
description("This test checks that DOMNodeRemovedEvent is emitted once (and only once).");

var div = document.createElement("div");
document.body.appendChild(div);

var count = 0;
document.body.addEventListener("DOMNodeRemoved", function () { count++; }, false);
document.body.removeChild(div);

shouldBe("count", "1");
</script>
</body>
</html>