title: Difference between screen.availHeight and window.height()
body: <p>I am executing the following Javascript on my browser (Firefox).</p>
  
  <ol>
  <li><p>console.debug("Screen height = "+ <strong>screen.availHeight</strong>); //outputs <strong>770</strong></p></li>
  <li><p>console.debug("Window Height ="+ <strong>$(window).height()</strong>);  //outputs <strong>210</strong> (I am using jQuery as well)</p></li>
  </ol>
  
  <p>What is the difference between the two? Is 770 in pixels and 210 in mm?</p>
  
  <p>Similarly, when I write <code>$(document).height()</code> and <code>$(window).height()</code>, there is a difference. What is the reason?</p>