A few years ago I built a button for an iPhone app that turned into a progress bar while loading: Here's a CSS version of it (with image assets). http://codep

A few years ago I built a button for an iPhone app that turned into a progress bar while loading: Here's a CSS version of it (with image assets). http://codepen.io/kballenegger/pen/uJGCF http://codepen.io/kballenegger/pen/uJGCF