React Sticky Element

react-sticky-el is a React component library designed to make elements stick to the viewport or a specified scrollable container as the user scrolls. It provides a straightforward `<Sticky />` component that can make any child element fixed to the top or bottom. The current stable version is 2.1.1, released in late 2021, and the project is generally considered to be in maintenance mode with infrequent updates. Key differentiators include its relative simplicity, support for custom scroll elements via the `scrollElement` prop, the ability to define a `boundaryElement` to limit stickiness, and flexible configuration for position re-checks. It ships with TypeScript type definitions, providing a typed developer experience.