Cascading Style Sheets Working Group

HTML 4.01 Test Suite for CSS 2.1 Conformance Testing

Thank you for offering to contribute results for the support of CSS2.1 conformance testing.

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The HTML 4.01 test suite contains 511 test cases. You can choose to conduct:

Note: You can stop running tests at any time without causing troubles. Also, the harness adds automatically in each test case the number of remaining test cases and a form to submitt results; these additions are not part of the original test cases, and their influence on the results should be ignored as much as possible. If you would like to see a particular test case without these additions a link is provided to open the test case in a separate window. In case of doubt, please hit the "Cannot Tell" button.

Developed and maintained by:
Dominique Hazael-Massieux (
David M. Berfanger (