First checked-in import of the W3C's test suites.

LayoutTests/imported/csswg-test/CONTRIBUTING.md

Index: LayoutTests/imported/csswg-test/CONTRIBUTING.md
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+Grant of License
+----------------
+
+By contributing to this repository, you and the company you 
+represent, if the company holds any copyrights in the contribution, 
+grant to the W3C a perpetual, non-exclusive, royalty-free, world-
+wide right and license under all of your copyrights in this 
+contribution to copy, publish, use, and modify the contribution and 
+to distribute the contribution under a BSD License or one with
+more restrictive terms, as well as a right and license of the same 
+scope to any derivative works prepared by the W3C and based on or 
+incorporating all or part of the contribution. You further agree 
+that any derivative works of this contribution prepared by the W3C 
+shall be solely owned by the W3C.
+
+You state, to the best of your knowledge, that you, or the company 
+you represent, have all rights necessary to contribute the materials.
+
+W3C will retain attribution of initial authorship to you. The W3C 
+makes no a-priori commitment to support or distribute contributions.
+
+Disclaimer
+----------
+
+All content from this repository is provided as is, and W3C makes no
+representations or warranties, express or implied, including, but 
+not limited to, warranties of merchantability, fitness for a 
+particular purpose, non-infringement, or title; nor that the 
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+interoperability.