I used to tinker quite a bit with Cascading Style Sheets. I don't much anymore. Here are some experiments I did that may be of interest.
This is an attempt to render the constructs of HTML 2.0 per their descriptions in RFC 1866.
When CSS support was new in Microsoft Internet Explorer 3.0, I put together this reference which documents what portions of the CSS1 specification are supported in that browser. Nowadays it's pretty dated; but, since there still might be a few folks out there still trying to use CSS compatibly with IE 3.0 (my sympathies), I'm leaving this page online for the time being.