title: How do iframe busters for expandable ads work?
body: <p>I have some questions about expandable ads and <code>&lt;iframe&gt;</code>s. I've created expandable ads which will displayed in <code>&lt;iframe&gt;</code>s. These ads will be served by known adservers like doubleclick, smartadserver, eyewonder, etc.</p>
  
  <p>Thanks to <a href="https://stackoverflow.com/questions/1792842/iframe-buster-files-whats-their-purpose">some questions on Stack Overflow</a>, I've discovered that they are some ways to break the ads out of the <code>&lt;iframe&gt;</code>s or even to dynamically resize the <code>&lt;iframe&gt;</code>s.</p>
  
  <p>I've found <a href="http://www.adopstools.net/?section=miscellaneous&amp;page=iframes" rel="nofollow noreferrer"><code>&lt;iframe&gt;</code> buster files</a> from the main ad serving company on the Internet, but I don't really get how they work.</p>
  
  <p>I know that I have to create a HTML file which I'll be giving along with my ad tag to the publisher, and they'll need to put it under their domain. But I don't understand how that file works. How do I interact with it from my JS?</p>