Conceived of, developed, designed, and launched in 24 hours: <a href="https://github.com/paulirish/lazyweb-requests/issues/53" rel="nofollow">https://github.com/paulirish/lazyweb-requests/issues/53</a><p>Tech: HTML5 drag n drop, FileReader, a[download], GIF encoding on the client, BlobBuilder, postMessage, <input type=range> (with Firefox polyfill), appcache, transforms, etc. Oh! and the aforementioned * { box-sizing : border-box; }