Acid4 is an upcoming series of tests of web standards for web browsers to be developed by Ian Hickson.

Development will begin when three of the four major rendering engines (namely Trident, Gecko, WebKit, and Presto) have builds (web browsers) that pass the Acid3 test, and will be finished and announced after all four of the major rendering engines have announced that they have fixed all the bugs found by Acid3. It has been suggested that Acid4 will be primarily focused on Scalable Vector Graphics, CSS3 and mixed namespaces.^[1]

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[edit] References

1. ^ http://www.hixie.ch/tests/evil/acid/004/

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