Ad viewability is a metric of determining how visible ads are to readers on your website. For an ad to be considered “viewed,” at least 50% of the ad must be displayed on the reader’s screen for at least one second (for display ads) or two seconds (for video ads).

Ad viewability is a highly impactful RPM optimization. You as the publisher should always consider it when making layouts and placing ads. A display ad is considered viewable if 50% of it appears on screen for at least 1 second. A 2014 Google study revealed that 56.1% of measured impressions at that time had failed […]