A JavaScript implementation of a web browser without its graphical user interface.
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Custom Elements (Web Components)
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Declarative Shadow DOM
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Mutation Observer
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Tree Walker
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Fetch API
And much more..
Documentation | Getting Started | Setup as Test Environment | GitHub
Vitest | Bun | Jest | Testing Library | Google LitElement | Vue | React | Svelte | Angular
Operation | JSDOM | Happy DOM |
---|---|---|
Import / Require | 333 ms | 45 ms |
Parse HTML | 256 ms | 26 ms |
Serialize HTML | 65 ms | 8 ms |
Render custom element | 214 ms | 19 ms |
querySelectorAll('tagname') | 4.9 ms | 0.7 ms |
querySelectorAll(':nth-child(2n 1)') | 10.4 ms | 3.8 ms |
See how the test was done here