event-listener-moving-documents.html

<!DOCTYPE html>
<body>
<script src="../../../../resources/js-test.js"></script>
<script>
description('Moving a Mutation Event listener between documents should keep it active');

var doc = document.implementation.createHTMLDocument('');
var div = doc.createElement('div');
var addedCalls = 0;
var removedCalls = 0;
div.addEventListener('DOMNodeInserted', function() { addedCalls++ });
div.addEventListener('DOMNodeRemoved', function() { removedCalls++ });
document.body.appendChild(div);
shouldBe('addedCalls', '1');
div.appendChild(document.createElement('span'));
shouldBe('addedCalls', '2');
div.removeChild(div.firstChild);
shouldBe('removedCalls', '1');
</script>
</body>

chromium/third_party/blink/web_tests/dom/mutation-event-tests/fast/events/event-listener-moving-documents.html