The Editing Area is the empty space below the editor toolbar where you type your text. All formatting applied using the toolbar buttons, as well as all inserted media, appear in this area.
If the document contents span beyond the limits of the editing area, a standard scrollbar will appear. To view the text that exceeds the size of the editing area, you can either scroll it using the scrollbar, or maximize the editor in the browser window using the button.
The Editor is a WYSIWYG(What You See Is What You Get) editor, which means that the text edited in it looks as similar as possible to the results end users will see after the document is published. When you format your text using the editor features, the formatting can be immediately seen in the editing area.