"When ads on a mobile page take up more than 30% of the vertical height of the main content portion of the page, the result is a disruptive ad experience, regardless of whether these ads are text, video, or static images. This includes “sticky” ads and in-line ads. This kind of density makes it very difficult to focus on text content on a mobile device, and can lead to frustrated users"
Since the 30% relates to the page and not the screen, do we estimate this by scrolling through the content portion of a mobile page and "Guesstimate" the 30%? I did use the links to go to that forum but didn't see this discussed.