11 / Scroll-driven

Curtain Overlap

The next panel covers the one before it rather than pushing it out of the way.

also called panel slide-over · curtain reveal · section overlap

Two rules and nothing else. The outgoing panel stays pinned while the incoming one rides over it, so the change reads as depth rather than travel. Note what is absent: no animation, no timeline, no measurement.

How it is built

.a { position: sticky; top: 0 } .b { position: relative; z-index: 2 }