1.1 index.js

import React from './react';
//import ReactDOM from 'react-dom';
let element = (
  <div id="A1">
    <div id="B1">
      <div id="C1"></div>
      <div id="C2"></div>
    </div>
    <div id="B2"></div>
  </div>
)
console.log(element);
/* ReactDOM.render(
  element,
  document.getElementById('root')
);
*/