"The likelihood is still high that when someone visits your site, they may still be using Internet Explorer or Netscape Navigator 3.x instead of the 4.x version."
The index page for the site gives a good explanation, "Note that this is not a commercial site. Other than being fairly old, the code and work here is no longer supported.
However, while not everything here is cutting edge, polished, bug-free, or 'ready-to-run', everything here should be interesting and educational for all users (even the more out of date sections), even today."
So some things have surely aged better than others. Sometimes older resources like this can be helpful in building some context.
http://www.gunther.web66.com/crossjava/
"The likelihood is still high that when someone visits your site, they may still be using Internet Explorer or Netscape Navigator 3.x instead of the 4.x version."