This is the place you actually write the code to make Pens. The standard editor is HTML, CSS, and JavaScript. / pen /

A way to look at (or share) a Pen that uses almost the whole screen to show the preview, and doesn’t show the code. / full /

Shows a large preview of the Pen, but you can still turn on the code areas if you wish. Details has more social information about your Pen, like who has loved it, the comments, sharing buttons, the license, and more. / details /

For looking at your Pen full-screen with no iframe. It’s only for logged in you (unless you’re PRO) , so it’s not great for sharing, but it’s great for debugging! /debug/

A full-screen preview of your Pen that live updates as you code. For PRO members only. /live/

And Professor Mode are PRO-only views for working in real-time with other people. /collab/

PRO-only view using the Pen Editor on an overhead projector, so there are more options for changing the view and extra room. /pres/

The code editor is placed on the left. /left/

The code editor is placed on top. /top/

The code editor is placed on the right. /right/