jitsi_app_c0/react/features/always-on-top/index.js

// @flow

import React from 'react';
import ReactDOM from 'react-dom';

import AlwaysOnTop from './AlwaysOnTop';

// Render the main/root Component.
// $FlowExpectedError
ReactDOM.render(<AlwaysOnTop />, document.getElementById('react'));

window.addEventListener(
    'beforeunload',
    () => ReactDOM.unmountComponentAtNode(document.getElementById('react')));