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These docs are old and won’t be updated. Go to react.dev for the new React docs.

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See Custom HTML elements in the new docs.

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React and Web Components are built to solve different problems. Web Components provide strong encapsulation for reusable components, while React provides a declarative library that keeps the DOM in sync with your data. The two goals are complementary. As a developer, you are free to use React in your Web Components, or to use Web Components in React, or both.

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Most people who use React don’t use Web Components, but you may want to, especially if you are using third-party UI components that are written using Web Components.

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Using Web Components in React

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class HelloMessage extends React.Component {\n  render() {\n    return <div>Hello <x-search>{this.props.name}</x-search>!</div>;\n  }\n}
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Note:

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Web Components often expose an imperative API. For instance, a video Web Component might expose play() and pause() functions. To access the imperative APIs of a Web Component, you will need to use a ref to interact with the DOM node directly. If you are using third-party Web Components, the best solution is to write a React component that behaves as a wrapper for your Web Component.

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Events emitted by a Web Component may not properly propagate through a React render tree.\nYou will need to manually attach event handlers to handle these events within your React components.

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One common confusion is that Web Components use “class” instead of “className”.

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function BrickFlipbox() {\n  return (\n    <brick-flipbox class=\"demo\">\n      <div>front</div>\n      <div>back</div>\n    </brick-flipbox>\n  );\n}
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Using React in your Web Components

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class XSearch extends HTMLElement {\n  connectedCallback() {\n    const mountPoint = document.createElement('span');\n    this.attachShadow({ mode: 'open' }).appendChild(mountPoint);\n\n    const name = this.getAttribute('name');\n    const url = 'https://www.google.com/search?q=' + encodeURIComponent(name);\n    const root = ReactDOM.createRoot(mountPoint);\n    root.render(<a href={url}>{name}</a>);\n  }\n}\ncustomElements.define('x-search', XSearch);
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Note:

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This code will not work if you transform classes with Babel. See this issue for the discussion.\nInclude the custom-elements-es5-adapter before you load your web components to fix this issue.

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