Viewport: max width: 480px like body max width : 480 px ? exist meta viewport max width param?
Your question is vague and may be misunderstood. Read here for more about the meta-tags:http://developer.apple.com/library/safari/#documentation/appleapplications/reference/SafariHTMLRef/Articles/MetaTags.html
I also didn't understand your question I think these links might help you.. http://ryanve.com/lab/dimensions/http://html5hacks.com/blog/2012/11/28/elegantly-resize-your-page-with-the-at-viewport-css-declaration/