sandboxBugPlayground.js

/**
 * External dependencies
 */
import '@babel/polyfill';

/**
 * WordPress dependencies
 */
import '@wordpress/editor'; // This shouldn't be necessary

import { render, useState, Fragment } from '@wordpress/element';
import {
	BlockEditorProvider,
	BlockList,
	WritingFlow,
	ObserveTyping,
} from '@wordpress/block-editor';
import { Popover, SandBox } from '@wordpress/components';
import { registerCoreBlocks } from '@wordpress/block-library';
import '@wordpress/format-library';

/* eslint-disable no-restricted-syntax */
import '@wordpress/components/build-style/style.css';
/* eslint-enable no-restricted-syntax */

const MySandBox = () => (
	<SandBox
		html="<p>Content</p>"
		title="Sandbox"
		type="embed"
	/>
);

render(
	<MySandBox />,
	document.querySelector( '#app' )
);