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base2 provides a seamless development platform that allows you to build JavaScript applications using standards without concern for which browser supports which methods. In terms of events, by providing the W3C event API, base2 allows you to use the standard event API with Internet Explorer.
base2 also provides support for the W3C Selectors API, which has recently been implemented in Internet Explorer 8, Firefox 3.1, Safari 3, and Opera 10. base2 uses a native implementation when one is present, which drastically increases efficiency and performance. When a native implementation is not available, base2 falls back on its own Selector API implementation, which is a tad slower, but still plenty fast.