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Happy DOM is a JavaScript implementation of a web browser
...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. Happy DOM now supports Declarative Shadow DOM which can be used for server-side rendering of web components. This package makes it possible to use Happy DOM with Jest.
Next-gen browser and mobile automation test framework for Node.js
...It comes with smart selector strategies that can, e.g. using the react$ command, fetch React components by its component name and filter it by its props or states. A similar command called $shadow provides the ability to fetch elements within the shadow DOM of a web component.