You can apply a global code to a creative preview on the Creative Review tab. This will allow you to see how things like scripts, footers, etc. interact with the rest of the page without creating an effort.

How to Preview a Global Code 

1. Click 
2. Click 
3. Highlight the line containing the Page you would like to edit and click the  button
   
   
   
   

4. Under the Creative Preview section complete the following fields:
   
   

   Domain Configuration	Select a domain configuration to apply the configurations global code to the creative preview. Any global code definition in the selected domain configuration with the "Apply to Creative Preview" option will be included in the previews source code. This option is se on each definition of Global Code.
   View Preview as:	Select the page to apply the global code preview to, select Page 1 or Page 2.

5. Click  to see how the global code will be applied.