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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
You can now use Autoprefixer in your Pens to handle CSS prefixing for you. Autoprefixer is a CSS processor that handles vendor prefixing of your properties and values for you, as needed. This new option sits alongside the option for using -prefix-free that we’ve had for a long time. The CSS settings panel in the editor. Using Autoprefixer The choice to use Autoprefixer is on each individual Pen, a
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