The pixel width and height of your page will depend on orientation as well as the meta viewport tag, if specified. Here are the results of running jquery's $(window).width() and $(window).height() on iPad 1 browser.
When page has no meta viewport tag:
When page has either of these two meta tags:
<meta name="viewport" content="initial-scale=1,user-scalable=no,maximum-scale=1,width=device-width">
<meta name="viewport" content="initial-scale=1,user-scalable=no,maximum-scale=1">
With <meta name="viewport" content="width=device-width">
:
With <meta name="viewport" content="height=device-height">
:
With <meta name="viewport" content="height=device-height,width=device-width">
:
With <meta name="viewport" content="initial-scale=1,user-scalable=no,maximum-scale=1,width=device-width,height=device-height">
With <meta name="viewport" content="initial-scale=1,user-scalable=no,maximum-scale=1,height=device-height">