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One of the pain points of feature testing in client-side scripting is that for event support. DOM doesn’t really specify any means to detect exactly which events browser understands and can work with. If you’d like to know if a browser supports, say, “dblclick” event, you’re pretty much out of luck. This is probably the reason why so many scripts on the web employ unreliable browser sniffing in such cases. One of the most common events that people sniff for are IE’s proprietary mouseenter/mouseleave, Opera’s impotent contextmenu, and input-related onbeforepaste, onbeforecut, etc. which are present in IE and WebKit, but not in Mozilla-based browsers.

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