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interactionsVercel

Overscroll Behavior

MUST

MUST: Intentional `overscroll-behavior: contain` in modals/drawers

Set overscroll-behavior: contain in modals and drawers

Bad

Good

Why it matters

When scrolling reaches the end of a modal or drawer, prevent the scroll from continuing to the page behind it. Use overscroll-behavior: contain to keep scroll interactions contained within the current layer.

References

Built by Gleb Stroganov, design engineer at Evil Martians.

The rules come from other people's skills and guidelines — Vercel, Rauno Freiberg, @Ibelick, impeccable, Emil Kowalski, Tailwind, RAMS — each one credited on the Sources page. The work here is extraction and wiring: every rule is pulled into one corpus, given a good and a bad example you can operate, a MUST/SHOULD/NEVER rule an agent can paste, and a link back to where it came from.