title: How can jquery || "OR" be used outside of an if statement?
body: <p>I've never seen the OR paramater || used outside of an if statement. </p>
  
  <p>What does this line of code do?</p>
  
  <pre><code>var doc = ($iframe[0].contentWindow || $iframe[0].contentDocument).document
  </code></pre>
  
  <p>Is it saying making it equal to either one of those???</p>