title: Is it advisable to load display advertising in an iframe?
body: <p>Some display advertising campaigns are very JavaScript heavy and it has a jarring effect on page load time because the ad is generally inline JavaScript - the useful parts of the page doesn't render until the ad did its thing.</p>
  
  <p>A solution seems to be to load the ad in an iframe in order to display useful content to a user while the ad loads in the background and "snaps into place" when it is ready.</p>
  
  <p>I've been told a number of drawbacks of an iframe approach:</p>
  
  <ul>
  <li>You are limited in the types of campaigns you can host - for example, no expanding ads that roll over content.</li>
  <li>If you have multiple ad units on one page you can't have combined campaigns.</li>
  <li>Advertisers avoid iframes because it is easier to game the system with false impressions</li>
  </ul>
  
  <p>Are these real concerns?  If so, are there any workarounds or should I keep display ads on page?</p>