You may try the webapp and read how they made it.
HTML5 Sortable is a jQuery plugin to create sortable lists and grids using native HTML5 drag and drop API.
Works in IE 5.5+, Firefox 3.5+, Chrome 3+, Safari 3+, and Opera 12+.
Google’s doodly tribute to Moog synthesizer is really something. Here’s a guide for the UI in JPG.
Of course, what interests us is that it’s done with HTML5 technologies only. I hope someone digs through it and writes about it.
wysihtml5 is an open source rich text editor based on HTML5 technology and the progressive-enhancement approach. It uses a sophisticated security concept and aims to generate fully valid HTML5 markup by preventing unmaintainable tag soups and inline styles.