capricorn86/happy-dom

Happy DOM is a JavaScript implementation of a web browser's DOM without a graphical user interface, designed to provide a robust testing environment for web applications. It supports modern DOM features like Custom Elements, Declarative Shadow DOM, and Mutation Observer, and works seamlessly with popular frameworks and testing libraries such as React, Vue, Jest, and Vitest. This project is ideal for developers looking to test their web applications in a controlled, headless browser-like environment.