React Example: Shadow Dom GitHub

import React from 'react'
import ReactDOM from 'react-dom/client'
import './index.css'
import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
import { ReactQueryDevtools } from '@tanstack/react-query-devtools'
import { DogList } from './DogList'

const appRoot = document.getElementById('root')
if (!appRoot) throw new Error('Missing #root element')

const queryClient = new QueryClient()
const shadowRoot = appRoot.attachShadow({ mode: 'open' })
const root = ReactDOM.createRoot(shadowRoot)

root.render(
  <React.StrictMode>
    <QueryClientProvider client={queryClient}>
      <div
        style={{
          width: '100vw',
          padding: '30px',
        }}
      >
        <h2>Dog Breeds</h2>
        <DogList />
      </div>
      <ReactQueryDevtools
        initialIsOpen={false}
        buttonPosition="bottom-left"
        shadowDOMTarget={shadowRoot}
      />
    </QueryClientProvider>
  </React.StrictMode>,
)