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Test Info:

<!DOCTYPE html>
<body>
<script>
var obs = new MutationObserver(function() {
// Just need something here to assert exception is not pending. Any
// binding method will do.
console.log("hello");
});
obs.observe(document.body, { childList: true });
</script>
<script>
noSuchMethodYo();
</script>
</body>