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Measurement

Viewable impression

An impression that met a visibility threshold, such as half the pixels on screen for one second (two for video).

Viewability is measured by a script or SDK in the player, usually a third party’s. The ad server fires the vendor’s pixel and reports what comes back.

Renderedon screenany durationcounted as impressionViewable50% of pixels1 s · 2 s videomeasured by vendorcounted as viewable
Rendered means it appeared. Viewable means enough of it stayed on screen long enough to count under the standard.
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