Look up HTML5, CSS3, etc features, know if they are ready for use, and if so find out how you should use them – with polyfills, fallbacks or as they are. Sep 25, 2010 - Introduction. Drag and Drop (DnD) is one of the many great features of HTML 5, and it is supported in Firefox 3.5, Safari, Chrome and IE. Google recently rolled out a new feature that allows Google Chrome users to drag and drop files from the browser to the desktop. It is an extremely convenient feature, but.Missing. Nov 28, 2017 - Using files from web applications. Using the File API, which was added to the DOM in HTML5, it's now possible for web content to ask the user to select local files and then read the contents of those files. This selection can be done by either using an HTML element or by drag and drop.