for example, in a form parsed by htmllib.HTMLParser (based on 
SGMLParser),

<option value="5" big"> 5" big

the value will not be unescaped to 5" while the printed
option will be.

Note that this behavior differs from that of 
HTMLParser.HTMLParser, which does a fine job.

See attached test script/test input for an example.

See attached patch for a fix: essentially I copied the code directly 
from HTMLParser.HTMLParser.

I don't think this patch should break anything; I can't imagine 
people were relying on this behavior!