title: Call native browser function, even after it has been overridden
body: <p>If I have something like</p>
  
  <pre><code>alert = 0;
  </code></pre>
  
  <p>in another script.</p>
  
  <p>This is in another script is and my code cannot load before that script.</p>
  
  <p>How can I call the original <code>alert</code> method in my script?</p>