Viewability is tracked through a JavaScript deployed at the time of the rendering of the ad, at an interval of 1 second. The "measured" rate indicates what rate of impressions have been successfully tracked for viewability. An ad impression is viewable when

  • either more than 50% of the ad surface is viewable to the user for at least one second.
  • or more than 30% of the ad surface of an ad of at least 242 500 pixels is viewable to the user for at least one second.

We do not attempt to track viewability for

  • ads marked as expandable
  • ads in cross domain iframes

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