Using parametric interface of external style, you can set the editing area style.

This is usually used to set the style of editing area as CSS style files which will be identical to your application system. In that way, the displaying effect in the editor will be identical to the output displaying effect in your application system.

In the following example, designating extcss=../example/myeditorarea.css, then inputting some text in the editing area, you will find the displaying effect is the same as that defined in myeditorarea.css