Publishers have good information on a per ad slot basis telling them how likely they are to be initially on screen. It's not yes/no, the way it would be if eve

Publishers have good information on a per ad slot basis telling them how likely they are to be initially on screen. It's not yes/no, the way it would be if everyone's screen was the same size or on a physical newspaper, but percentages are still useful. Mostly people use viewability instead: https://headerbidding.co/mrc-viewability-standards/ https://headerbidding.co/mrc-viewability-standards/