Brought over from the Dimensions plugin, the .offset() method allows you to find the offset of the element (as 'top' and 'left') from the top-left corner of the document.

Demo
View Source

Access the offset of the second paragraph.

var p = $("p:last");
var offset = p.offset();
p.html( "left: " + offset.left + ", top: " + offset.top );

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
                    "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
  <script src="http://code.jquery.com/jquery-latest.js"></script>
  
  <script>
  $(document).ready(function(){
    var p = $("p:last");
var offset = p.offset();
p.html( "left: " + offset.left + ", top: " + offset.top );
  });
  </script>
  
</head>
<body>
  <p>Hello</p><p>2nd Paragraph</p>
</body>
</html>

.height() / .width() for document and window

The .height() and .width() now work on the document and window objects; allowing to get the height and width of the document body and the window viewport.

Code

Get the width of the window viewport.

$(window).width();

Code

Get the height of the document.

$(document).height();