Redactor is a WYSIWYG editor for the web, it has a lot of official plugins but you may want to make your own in order to support a particular feature. Lately, I made a plugin to be able to add colored code blocks (as you can see in this post for instance). It’s called redactor-codeblock-plugin . Given the few resources available in the Imperavi documentation I decided to write this guide to help anyone who wants ot join the party.