Scroll Depth
In one sentence
How far down a page visitors get, expressed as a percentage.
Analogy Mental model
Which page of the book the reader reached. Cover only, or the final chapter?
In practice What you actually do
Track the 25, 50, 75 and 100 percent marks separately. On a long guide, a large drop between 25 and 50 usually means the introduction ran long. A cliff at one specific point marks the paragraph that lost them.
Where people get burned Pitfalls
Reading the number without the position tells you nothing. Fifty percent on a page with the answer at the top is fine; fifty percent on a page with the answer at the bottom means nobody saw it. Move the answer.
This entry was written in English from the Chinese original, not machine-translated. Read the Chinese version →