This is preferable to :hover if it works ok cross-browser. I think/hope that most web developers have realized by now that displaying new UI-elements on hover i

This is preferable to :hover if it works ok cross-browser. I think/hope that most web developers have realized by now that displaying new UI-elements on hover is a bad idea, at least if they will hide other elements. Moving your mouse around is not "intent" to perform an action. A slight delay on a mouseover event is less evil though.