CKEditor and SCEditor are WYSIWYG editor. But, markdown editor is not WYSIWYG editor. Outputs of markdown editor is markdown (not HTML) code. This is not intuitive. To solve this problem, there is preview area in markdown editor. CKEditor has preview plugin. However, edited contents are displayed (previewed) in another page. Since same CSS is not applyed, this is not good. In the WYSIWYG editor, edit area itself should be a preview area.