Microsoft Internet Explorer 6 on Windows XP allows remote attackers to cause a denial of service (crash) via a table with a frameset as a child, which triggers a null dereference, as demonstrated using the appendChild method.
https://exchange.xforce.ibmcloud.com/vulnerabilities/27592
http://www.vupen.com/english/advisories/2006/2701
http://www.securityfocus.com/bid/18873
http://browserfun.blogspot.com/2006/07/mobb-7-tableframeset.html