This page contains a list of CSS tests about various arguments of CSS specifications. My purpose is to help people who are still full of (necessary) doubts about style sheets.

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CSS 2.1: section 4
Tests on syntax and basic data types.
CSS 2.1: section 8
Tests on collapsing margins and negative margins.
Internet Explorer 6 default style sheet
An hypothetical default style sheet for Internet Explorer 6.
Opera 9 dropcap test
What is the rendering for dropcaps in Opera 9?
Opera 9 CSS Test suite
Various tests on Opera 9.