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This is a performance comparison between FF 3.6 Element#className feature and JavaScript based css-classes management used in RightJS. Please visit this article for more information.

In the tables below Native - means FF 3.6 native implementation, Proper - does the same thing as RightJS does it.

Add Class Test (ms)
Native
Proper
Has Class Test (ms)
Native
Proper
Remove Class Test (ms)
Native
Proper
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NOTE: currently it works in FF 3.6 only!