Live demos for the talk "What the browser does when nobody's watching"
content-visibility
300-product catalog. One CSS property. 7× rendering improvement.
Kanban with 100 cards. contain: layout scopes reflow to the edited column. INP drops 5×.
contain: layout
The free optimization most SPAs break without knowing it.
Native app transitions. No libraries. No GSAP. No tricks.
The browser prerenders the next page before you click. LCP ≈ 0ms.