Apple has released Safari 4 beta to the public.

The release is incredibly impressive, with over 150 new features, including support for some HTML5 elements along with improvements in the rendering engine.

Safari 4 also scores an impressive 100/100 in Acid 3 which tests a browsers standards compatibility. Opera 10 alpha and Safari 4 beta are now the only two main web browsers to reach this feat.

Safari 4 includes a new JavaScript rendering engine called Nitro. It’s claimed to be 4 times faster than Firefox 3.1 and 6 times faster than Internet Explorer 8. Benchmark results should be out soon.

Users can download Safari 4 beta for both Windows and Mac today.

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