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The Web Standards Project is a grassroots coalition fighting for standards which ensure simple, affordable access to web technologies for all.

They have developed several test suites to test browsers compatibility to the w3c standards.

• http://acid2.acidtests.org/
• http://acid3.acidtests.org/

The most interesting JavaScript cross browser test suite is probably: http://code.google.com/p/js-test-driver/

Using jslint within the build process is possible with http://code.google.com/p/jslint4java/