Full Page
An ad that appears "between pages", after a user has clicked to navigate to another page, but before that page loads.
Pixels: up to 640x480 for ads submitted for local serving; others can be set to expand to size of browser window.
Max. File Size: 60K
Animation: Displays up to 15 seconds
Rich Media: Yes
Third Party: Yes*
Location: Sidewide
Notes: * Third party served Interstitials must include an approved Boston.com header.