To ensure that page layouts reflect what your viewing audience will see, you can configure the Layout Editor to preview different browsers and devices, and to show or hide screen elements. For example, you can specify an Internet Explorer profile if most of your viewers use Windows, or specify a Nokia or NTT DoCoMo profile for a mobile audience. Changing basic profiles doesn’t change source code; rather, it simply provides an accurate preview. You can freely switch from one profile to another as you develop a page.

View options are particularly powerful when combined with the @media rule and media type option for stylesheets. If you’ve created different styles for media types such as screen and handheld, you can preview each of them by using the Target Media option.