Underneath the hood, CodePen uses the CodeMirror editor. CodeMirror has just released v4, and we spent some time upgrading to it. Some of the upgrades help us as developers, but there are some pretty sweet upgrades for you! We’ve also made some upgrades of our own. Multiple Cursors and Multiple Selections Use the Command key and click (or click and drag to select stuff) and you’ll be able to use m