DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

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<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">

function boom()
{
  ({})[document.createElement('unsupported').tagName];
  uneval(Components.interfaces.nsIWebNavigationInfo);
}

</script>
</head>

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