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http://www.ebay.com contains a script element of the form
<SCRIPT>
...
 vbscript += "</SCR"+"IPT> \n";
...
</SCRIPT>
which is not enclosed in "<!-- ... -->" comments. The parser 
choked on that line, indicating it was a mal-formed end tag.
The changes are:
 interesting_cdata is now a dict mapping start tag to
 an re matching the end tag, a "<--" or \Z
 HTMLParser.set_cdata_mode takes an extra argument, 
 the start tag