For adj custom creatives, the DART ad server returns JavaScript code that uses document.write() statements for adding the custom creative code to the document that contains the JavaScript tag. A side effect of the document.write method is that if the document has already loaded (DOMContentLoaded or onload event) it could "blank out" the publisher's web page, erasing everything. Modern browsers do not produce this side effect.

• Firefox 4.0+
• Chrome*
• Safari 5.06+
• Internet Explorer 9+

*Chrome 21 is currently in our Quality Assurance queue. 

1. Exclude browsers that do not handle asynchronous document.write statements gracefully.
2. Log metric event when an exclusion occurs.
   
3. Research migration to DFP5