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chromium/third_party/blink/web_tests/dom/mutation-event-tests/fast/dom/subtree-modified-attributes.html 

<!DOCTYPE html>
<body>
<script src="../../../../resources/js-test.js"></script>
<script>
description('DOMSubtreeModified should fire when attributes are added or removed, but not modified (see bug 81141)');

var div = document.createElement('div');
document.body.appendChild(div);
var expected = false;
div.addEventListener('DOMSubtreeModified', function(evt) {
    shouldBeTrue('expected');
});
expected = true;
div.setAttribute('foo', 'bar');
expected = false;
div.setAttribute('foo', 'baz');
expected = true;
div.removeAttribute('foo');

var attr = document.createAttribute('bar');
attr.value = 'foo';
expected = true;
div.setAttributeNode(attr);
expected = false;
attr.value = 'bar';
expected = true;
div.removeAttributeNode(attr);
</script>
</body>