Display viewable impression
At least 50% or more of the pixels were in an in-focus tab on the viewable space on the browser page for at least one continuous second, post ad renders
For large sized display ads: 30% or more of the pixels
For expandable rich media: it can be based on pixel count of smaller initial tag format or larger, expandable format (needs to be disclosed to the user)
Ad Centric: Relies on counts generated from an ad server’s systems. !!!
Site Centric: Relies on counts generated from a web property’s systems.
User Centric: Relies on counts derived in some fashion based on the activity of internet users.
Test resp_float_instream DFP
Test resp_on_demand DFP
Test resp_float_on_demand DFP