airbnb/lottie-web

This project is a cross-platform animation engine and vector animation player designed to render complex motion graphics within web browsers. It functions as a declarative motion framework, allowing developers to decouple visual design from application logic by using structured data files to define sophisticated animations.

The library distinguishes itself by offering multiple rendering paths, including native support for vector graphics through the browser document object model and raster-based drawing via canvas elements. It utilizes a dedicated property interpolation engine to calculate keyframe states and timing curves, ensuring that motion remains consistent and crisp across different screen resolutions and platforms.

The engine manages the full lifecycle of an animation, from parsing structured data files to orchestrating playback loops that synchronize with the browser refresh rate. By organizing visual elements into a nested composition hierarchy, it supports the delivery of lightweight, interactive assets that respond to user input while maintaining performance through hardware-accelerated rendering.