Viewability
In order to ensure that advertisements are actually seen on websites or in apps industry viewability standards have been drafted. Publishers have to commit to these, and implement reporting support. Today, an online display ad view is defined by a minimum of 50 percent of pixels in view for a minimum of one second. For an online video, the minimum is 50 percent in view for two seconds. Advertisements that are under the fold will not be considered as viewed, just like in-browser videos that has been skipped by the user in a few seconds.