"Copy to clipboard" functionality is something we all use dozens of times daily but the client side API around it has always been lacking; some older APIs and browser implementations required a scary "are you sure?"-style dialog before the content would be copied to clipboard -- not great for usability or trust. About seven years back I blogged about ZeroClipboard, a solution for copying content
![JavaScript Copy to Clipboard](https://cdn-ak-scissors.b.st-hatena.com/image/square/9993c9cdb0a517bc9f01c87e168851edb677bade/height=288;version=1;width=512/https%3A%2F%2Fdavidwalsh.name%2Fwp-content%2Fthemes%2Fpunky%2Fimages%2Flogo.png)