WYSIWYG

What You See Is What You Get (WYSIWYG)

WYSIWYG implies a user interface that allows the user to view something very similar to the end result.

Snippet from Wikipedia: WYSIWYG

In computing, WYSIWYG ( WIZ-ee-wig or ), an acronym for What You See Is What You Get, is a system in which editing software allows content to be edited in a form that resembles its appearance when printed or displayed as a finished product, such as a printed document, web page, or slide presentation.