The Style Rendering toolbar (hidden by default) contains buttons that let you see how your design would look in different media types if you use media-dependent style sheets. It also contains a button that lets you enable or disable CSS styles. To display the toolbar, select View > Toolbars > Style Rendering.
This toolbar only works if your documents use media-dependent style sheets. For example, your style sheet might specify a body rule for print media and a different body rule for handheld devices. For more information on creating media-dependent style sheets, see the World Wide Web Consortium website at www.w3.org/TR/CSS21/media.html.
By default, Dreamweaver displays your design for the screen media type (which shows you how a page is rendered on a computer screen). You can view the following media type renderings by clicking the respective buttons in the Style Rendering toolbar.
For a tutorial on designing style sheets for print and handheld devices, see www.adobe.com/go/vid0156.