429088-2.html - mozsearch

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<!DOCTYPE html>

<html>

<head>

<script type="text/javascript">

function boom()

  window.addEventListener("DOMSubtreeModified", function(){});

  var span = document.createElement("span");

  document.body.appendChild(span);

</script>

<style type="text/css">

span:before { content: '0'; }

span:after { content: '1'; }

</style>

</head>

<body onload="boom();"></body>

</html>