title: Text find inside a cross-domain iframe
body: <p>Is it possible i can find and compare some text strings between my website and a cross domain iframe inside it? 
  Suppose i have:</p>
  
  <pre><code>&lt;html&gt;
  &lt;body&gt;
  &lt;div&gt;&lt;p&gt;hello world&lt;/p&gt;&lt;/div&gt;
  &lt;iframe&gt;&lt;html&gt;&lt;body&gt;&lt;div&gt;&lt;p&gt;hello world&lt;/p&gt;&lt;/div&gt;&lt;/body&gt;&lt;/html&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>is it possible to build a find and compare algorithm that will be able to check the text on my website and compare it with the one inside the cross domain iframe? Should i require the use of the <code>postmessage</code> or is there something simpler in terms of just making just a simple text find and compare inside the browser screen?</p>