Scroll depth
also: scroll reach
Scroll depth measures how far down a page visitors travel, usually as the percentage who reach a given point. It reveals where attention decays on the way down — the point past which most visitors never see your content, however good it is.
Real scroll-depth data comes from analytics after you have traffic. But you can predict the shape before launch: every screen of a page can be scored for attention, revealing the 'scroll journey' — where interest peaks and where it collapses.
The two views complement each other. Prediction tells you which sections are visually weak (and likely to lose readers); measured scroll depth confirms where they actually stop. Fixing the predicted cold sections before they cost you real drop-off is the cheaper half of the job.
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