scrollY 0 last flick: -

iOS momentum scroll test

Flick up or down quickly, then lift your thumb.

The box in the top right shows coast: how far the page kept moving after your thumb left the glass. In Safari a hard flick coasts thousands of pixels. 0px means no momentum.

Section 20 has a small scroll box. Flick inside it too, to compare an inner scroller with the page itself.