In the mailing list archives at
http://blade.nagaokaut.ac.jp/ruby/ruby-talk/index.shtml the HTML code
is invalid. It has <h3> tags within <pre>, which is not allowed. (The
HTML 4.0 standard only allows the elements mentioned in
http://www.htmlhelp.com/reference/html40/inline.html inside <pre>.)

As a result, the threading pages look messed up in Opera 6. See this
screenshot:

http://lina.aaanime.net/~pmak/bad_thread.gif

The screenshot is taken from this URL, which looks fine in IE 6:

http://blade.nagaokaut.ac.jp/ruby/ruby-talk/thr44739-45058.html

Could someone fix the code? Instead <h3>stuff</h3>, it should do
something like <big><b>stuff</b></big>.