Why Viewport Visibility Does Not Equal a Valid Survey Impression

A developer behind RetroPrompt has outlined the technical and methodological care required when measuring survey exposure on a webpage. The article explains that a page view alone cannot confirm a visitor actually saw an optional question, since the question appears below the main tool and can be missed entirely. Using the browser's IntersectionObserver API, exposure is defined as at least 50% of the survey panel entering the viewport, though this still does not guarantee the visitor read or engaged with it. The piece warns against conflating unanswered sessions with a preference for the default option, and stresses that first-choice selections and silence must be reported separately. It also cautions that self-selected survey responses do not indicate demand, and that small sample sizes should always be accompanied by an acknowledgment of uncertainty.