While designing a web page, a designer needs to remember that his viewers will be using different browsers with different resolutions. So while creating the page, he must check the appearance of the page in different screen resolutions. Well but it is a pain to repeatedly change the screen resolutions to check how your page would look in different screen resolutions. Expression Web has this feature of ‘Page size’ which allows you to do this while you are creating the page without having to change the actual screen resolution.

In View menu, select Page Size and then select a page size from the list. The page size will now applied to your current page, and you can check how your page will appear in the browser with that resolution.