The Mindtouch platform we are using for the LibreTexts uses a modified CKE editor that allows for module construction without having to build/edit the raw source (HTML) code directly. The CKEditor is a ready-for-use open source WYSIWYG text editor from CKSource designed to bring common word processor features directly to web pages, simplifying their content creation. It has been configured for most of the needs contributors require. The layout is below; please refrain from using the advanced features in red until you are familiar with the Mindtouch structure. The Toolbar is the section located at the top of the editor window. It contains menu buttons that give you access to various functions of CKEditor. All buttons are grouped according to their function and include both simple operations (like basic text styling or formatting) and more advanced features (like inserting media or forms via a dialog window).
Figure: A simple layout of the Mindtouch CKE editor without labels. Buttons labels in red are advanced features.