If only it were that easy. As it turns out, default behavior is sometimes to drag (as when you have already selected text). In my experiments this business of p

If only it were that easy. As it turns out, default behavior is sometimes to drag (as when you have already selected text). In my experiments this business of preventing default became quite frustrating, as sometimes you want to stop drags but not selection, or vice versa, but end up stopping both. The correct way to do this is to allow the programmer to start a drag. As it stands, it is impossible to do things such as only allow vertical drags and not horizontal drags since the API is completely declarative and takes place on an element-by-element basis.