title: returning with &&
body: <p>What does it mean to return a value with &amp;&amp;? </p>
  
  <pre><code>else if (document.defaultView &amp;&amp; document.defaultView.getComputedStyle) {
  
      // It uses the traditional ' text-align' style of rule writing, 
      // instead of textAlign
      name = name.replace(/([A-Z]) /g, " -$1" );
      name = name.toLowerCase();
      // Get the style object and get the value of the property (if it exists)
      var s = document.defaultView.getComputedStyle(elem, " ") ;
      return s &amp;&amp; s.getPropertyValue(name) ;
  </code></pre>