title: JS "Window" width-height vs "screen" width-height?
body: <p>I am wondering a little when I look at this code:</p>
  
  <pre><code>// Get the screen height and width
  var maskHeight = $(document).height();
  var maskWidth = $(window).width();
  
  ...
  
  // Get the window height and width
  var winH = $(window).height();
  var winW = $(window).width();
  </code></pre>
  
  <p>What is the difference between <code>$(document).height();</code> and <code>$(window).height();</code>?</p>