Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. It includes many web standards from WHATWG DOM and HTML.
The goal of Happy DOM is to emulate enough of a web browser to be useful for testing, scraping web sites and server-side rendering.
Happy DOM focuses heavily on performance and can be used as an alternative to JSDOM.
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Custom Elements (Web Components)
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Shadow Root (Shadow DOM)
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Declarative Shadow DOM
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Mutation Observer
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Tree Walker
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Fetch
And much more..