Nanopop is an ultra‑tiny, dependency‑free JavaScript engine that positions one element (the “popper”) relative to another (the “reference”) with fine‑grained control over placement, margins, flipping, and container boundaries. It’s aimed at developers who need fast, low‑footprint tooltips, dropdowns, or similar UI elements and want to manage updates (e.g., on scroll or resize) themselves rather than rely on larger libraries like PopperJS.