Waypoints is a JavaScript library designed for monitoring scroll positions and managing viewport-based triggers. It provides utilities to execute functions when page elements enter or exit the visible browser area, track specific scroll offsets, and implement sticky element pinning.
The library includes specialized tools for building infinite scrolling interfaces that fetch and append content to replace traditional pagination. It also manages the positioning of elements that transition to a fixed screen location once a specific scroll threshold is reached.
The system covers broader capabilities in viewport interaction and scroll management, including visibility detection, direction-aware event dispatching, and the coordination of grouped triggers to synchronize state and execution order.