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chromium/third_party/blink/web_tests/fast/dom/MutationObserver/mutation-observer-prefix.html 

<!DOCTYPE html>
<script src="../../../resources/js-test.js"></script>
<script>

description('Test that new WebKitMutationObserver is the same as new MutationObserver.');

var noPrefixObserver = new MutationObserver(function() { });
var prefixObserver = new MutationObserver(function() { });

shouldBeTrue('noPrefixObserver instanceof WebKitMutationObserver');
shouldBeTrue('prefixObserver instanceof WebKitMutationObserver');
shouldBeTrue('noPrefixObserver instanceof MutationObserver');
shouldBeTrue('prefixObserver instanceof MutationObserver');
</script>