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The client-side mouse events currently make no distinction between no button pressed and left button pressed. (The only exception is IE7+8, which isn't W3C-conform). This is not relevant for mouse up/down/click event, but very much for move/enter/exit. While we don't support those on the server, they are supported in ClientScripting, where it might be needed for DND-like features. There seems to be no bulletproof way to detect this (as the button could be released outside the document), but it should work at least as long as the mouse stays in the document.