Mercury Editor is a fully featured editor much like TinyMCE or CKEditor
Mercury Editor : The Rails HTML5 WYSIWYG editor, it is a full-featured editor like TinyMCE or CKEditor , but with a different usage paradigm . He expects a whole page is something that can be edited , and allows different types of editable regions are indicated . It shows a single toolbar for each region on the page , and uses the HTML5 contentEditable functions on block elements , instead of iframes that . For CSS to be applied in a manner that can not handle many other editors.