Adobe BrowserLab provides web designers exact renderings of their web pages in multiple browsers and operating systems, on demand. BrowserLab is a powerful solution for cross-browser compatibility testing, featuring multiple viewing and comparison tools, as well as customizable preferences. Since BrowserLab is an online service, it can be accessed from virtually any computer connected to the web.

Other features of BrowserLab are:

• Additional browser support: Preview web pages in more browsers: Internet Explorer 8 and Safari 4. Each of these additional browsers can be added to existing Browser Sets.
• Rulers and Guides: Pinpoint the exact location of any area within a screenshot. Rulers on the X and Y axes show you precise pixel dimensions, with optional guidelines for added accuracy.
• Move and Pan: Move to any area of a screenshot by simply clicking and dragging your mouse, or using the arrow keys.
• Onion Skin Registration: Tackle precise layout issues within specific areas of your designs, with custom registration of the screenshots in BrowserLab’s Onion Skin view.
• Screenshot Delay: Pause the rendering of a screenshot by up to 10 seconds, so you can preview content that needs time to generate.

Adobe BrowserLab can be used on:
Firefox 2.X and 3.X (Windows XP and Mac OS X)
Internet Explorer 6.X, 7.X, and 8.X (Windows XP) – Updated
Safari 3.X and 4.X (Mac OS X)

Currently, Adobe BrowserLab is on free preview which is available to a limited number of users.