Of all the technologies web developers need to master, it seems the one that causes the most confusion and potential problems is drag ‘n’ drop. This is not a new technology, it’s been around for years, but many developers are still clinging to old jQuery based methods to implicate complicated (sometimes slow and inaccurate) drag-and-drop emulation. Now that HTML5 includes a drag-and-drop API, you already have a very simple way to implement drag-and-drop without headaches. Understanding...