You should really check out this stylesheet demo site. It renders boxes properly with Netscape 4.5 in WinNT. I also recommend trying different browsers against the W3C CCS Test Suite if you want to know what they can do, it's a great reality check when something you coded doesn't show up right. Western Civ has some interesting if semi-ugly pages with a great browser compatibility matrix. They also have other good stuff nearby. Since imperfect HTML can get really hosed by stylesheets, validate your html. If you use CGI.pm, watch out--it generates a HTML 2.0 doctype descriptor that this validator hates (is this a bug?). You may also want to validate your stylesheet. I hope you find this info useful, even though it ain't strictly Perl.
Update: The newest versions of CGI.pm can generate a variety of doctype declarations.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link or
or How to display code and escape characters
are good places to start.