24 / Scroll behaviour

Overscroll Containment

Push both panels past their last line. One hands your gesture on to the page behind it; the other keeps it.

also called scroll chaining · overscroll-behavior · gesture trapping

One property, and it is the whole difference between a panel that feels solid and one that feels like a leak. The chaining default is right for a document and wrong for almost every overlay.

How it is built

overscroll-behavior: contain;