<! DOCTYPEhtml>
<html>

<head>
    <meta charset="UTF-8" />
    <title>React binds events to the body and prevents events from bubbling</title>
    <script src="https://unpkg.com/react@16/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
    <script src="https://unpkg.com/[email protected]/babel.min.js"></script>
    <style>
        html{height: 100%; }body{height: 100%;background-color: rgba(0.0.0.0.2); }.m-outer{background-color: red; }</style>
</head>

<body>
    <div id="root"></div>
    <script type="text/babel">
        class Toggle extends React.Component {
        constructor(props) {
          super(props);
          this.state = {isToggleOn: true};
 
          // This binding is necessary to make 'this' work in the callback
          this.handleClick = this.handleClick.bind(this);
        }

        componentDidMount() { 
            document.body.addEventListener('click'.e= > { 
                if (e.target && e.target.matches('#m-btn')) { 
                    return; 
                }             
                console.log('body');
            });             
        } 

        componentWillUnmount() { 
            document.body.removeEventListener('click');
        }                

        handleClick() {
          this.setState(prevState= > ({
            isToggleOn: !prevState.isToggleOn
          }));
        }
 
        render() {
          return (
              <button onClick={this.handleClick} id="m-btn">
                {this.state.isToggleOn ? 'ON' : 'OFF'}
              </button>
          );
        }
      }
 
      ReactDOM.render(
        <Toggle />.document.getElementById('root'));</script>
</body>

</html>
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