Imagine a scenario where click-happy visitors may undo normalcy by double-clicking the submit button, or perhaps an otherwise normal albeit impatient user might click it a second time. Submit buttons frequently need to be disabled or removed using client-side code for just such a reason.
Tip
Users that double-click everything
It is not entirely known where double-clicking users originated from. Some believe that single-clicking-users needed to be able to double-click to survive in the wild. They therefore began to grow gills and double-click links, buttons, and menu items. Others maintain that there was a sudden, large explosion in the vapors of nothingness that resulted in hordes of users that could not fathom the ability of a link, button, or menu item that could be opened with just a single click. Either way, they are out there, and they mostly use Internet Explorer and are quickly identifiable by how they type valid URLs into search...