Opera 10.5 is the most reliable browser – says Google

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Sputnik is a new tool from Google labs, a JavaScript conformance test suite, a comprehensive set of more than 5000 tests. (from Chromium Blog).

It can test your browser and will let you know the number of failures (among 5000 test cases).

Opera 10.5 wins the test with just 78 failures (in 5000 test cases).
Safari 4 comes next with 159 failures, Chrome 4 : 218, Firefox 3.6: 259 failures and Internet Explorer 8: 463 failures.

Learn more:
Sputnik project
Sputnik test runner – test your browser yourself
Official announcement