Wombat stew,
Wombat stew,
Gooey, brewy,
Yummy, chewy,
Wombat stew!
— Marcia K. Vaughan. Wombat Stew. Silver Burdett Pr, 1986

In this chapter, you will learn how to create and present a graphical user interface (GUI). While JavaScript and HTML are used to create a GUI, it is CSS that is responsible for what your GUI looks like. HTML is concerned with the markup of your GUI and CSS handles the presentation, while JavaScript is the programming language that allows your GUI to be responsive to your input. The trio of CSS/HTML/JavaScript will be used to walk you through the creation of a simple dialog box.