Now the top 4 browsers have either released or announced a version of their browser that passes Acid2 work on Acid3 has restarted and Ian Hickson has been adding testcases over the last few weeks. Acid3 is primarily concerned with ECMAScript and the DOM though Selectors Level 3, Media Queries, and data: URIs are also tested. The idea of the test is to run 100 ECMAScript functions that either return true (pass) or false (fail). I believe 16 of those functions are missing at the moment and people are encouraged to contribute. Tests need to be justified by a specification at W3C Candidate Recommendation, W3C Recommendation, or equivalent for non-W3C consortia, and be from 2004 or before. I believe that if browsers once again commit to fixing the bugs found by this test Web authoring will improve tremendously.

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