scrollMonitor

Only touches the DOM twice per scroll event with minimal memory overhead, making it efficient for creating many watchers without slowing down the page.

Supports monitoring DOM elements, objects with top/bottom properties, numbers, jQuery objects, NodeLists, or CSS selectors, offering flexibility in what to track.

Allows creating scroll monitors for any scrollable element beyond the body, enabling complex nested scrolling scenarios as shown in the demos.

Provides events like enterViewport, exitViewport, and offset options to trigger actions precisely when elements are near the viewport edge.

Enables watchers to lock positions, which is ideal for implementing fixed elements or scroll-based animations without recalculations.