happy-dom

• A JavaScript implementation of a web browser without its graphical user interface.
• Provides DOM features including:
  • Custom Elements (Web Components)
  • Declarative Shadow DOM
  • Mutation Observer
  • Tree Walker
  • Fetch API
  • And more

Works With:

• Testing frameworks: Vitest, Bun, Jest, Testing Library
• UI frameworks: Google LitElement, Vue, React, Svelte, Angular

Links:

• Documentation
• Getting started
• Setup as Test Environment