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DOM: Impression/Tracked Ads Counting

Impression/Tracked Ad Counting

An “Impression” (JS Tag only) is counted based on different criteria, depending on the format:



Banner/Rich Media (Display Ad Impressions)

An impression is counted at a minimum on begin-to-render. Within all modern browsers supporting the HTMLImageElement.complete property, an impression is counted once the ad has completed rendering and has dimensions greater than 10 pixels (to exclude empty elements or tracking pixels).


An impression is counted after the ad has completed buffering and the video has started playing.

A “Tracked Ad” is counted when the impression is rendered, the JS Tag is incompletely executed, the ad unit was not found, or when clients are using the pixel instead of JS Tag. This should be the metric client should use to count the total number of requests.

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