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chromium/third_party/blink/web_tests/tables/mozilla/bugs/bug53690-2.html 

<HTML><BODY><form action="1"></form><form action="2"></form><TABLE border=1><TR><TD>
 <SCRIPT language=JavaScript>

document.write('<form action="' + document.forms[1].action + '">');

</SCRIPT>
</TD><TD>X</TD></TR></TABLE>