Sometimes. But do you really need to support a browser that less than half a percent uses? And isn't the fallback that HTML offers out of the box good enough t

Sometimes. But do you really need to support a browser that less than half a percent uses? And isn't the fallback that HTML offers out of the box good enough then? Sure, there are those rare cases where you build an appointment system for a hospital and where laws (rightfully!) dictate that the date picker must be both accessible and working on anything from IE6 to the browser on the first Wii. But your average 99.99% of the sites?