title: getElementID dont work on chrome
body: <p>I have a code like this:  </p>
  
  <pre><code>parent.document.getElementById("test").value ="1";
  </code></pre>
  
  <p>but it doesnt work on chrome. The error is:</p>
  
  <blockquote>
    <p>"Uncaught TypeError: Cannot call
    method 'getElementById' of undefined"</p>
  </blockquote>
  
  <p>any help is apreciated thanks in advance! :)</p>