One of the most common types of ads are the ones that are not just disguised, but seem to not even be there at all. These ads are known as Hidden ads and can be carried out in the use of:
- Stacked ads, where multiple ads are layered on top of each other in a single ad placement, commonly referred to as “nesting.”
- Ads clipped by iframes, making the video ad impossible to view.
- Zero opacity ads that use an iframe with the opacity set to zero, making it non-viewable.
- 1×1 pixel iframes that host ads where the visible portion is so small they are not viewable.
Hidden ads are a way to place additional, non-viewable ads on a webpage, fraudulently increasing a publisher’s ad revenue. Commonly executed through the use of an iframe, or a window within a window, these ad placements are presented as legitimate inventory when in reality, the placements are essentially invisible to the end user.
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