React Js Get id of element onClick

<!DOCTYPE html>
<html>

<body>
  <div id="app"></div>
  <script type="text/babel">
    function App() {
      const handleClick = (event) => {
        const clickedElementId = event.target.id;
        alert(`Clicked element ID: ${clickedElementId}`)
      }

return (
        <div className='container'>
          <h3>React JS onClick event handler</h3>
         <button className="clickable-element" id="button1" onClick={handleClick}>
            Click me 1
          </button>
          <button className="clickable-element" id="button2" onClick={handleClick}>
            Click me 2
          </button>
        </div>
      );
    }

ReactDOM.render(<App />, document.getElementById("app"));
  </script>
  <style>
    .container {
      text-align: center;
      padding: 20px;
      box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
      margin: 0 auto;
      max-width: 600px;
    }
  </style>
</body>

</html>

 
<!DOCTYPE html>
<html>
​
<head>
  <meta charset="UTF-8" />
  <script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script>
  <script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.development.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>
</head>
​
<body>
  <div id="app"></div>
  <script type="text/babel">
    function App() {
      const handleClick = (event) => {
        const clickedElementId = event.target.id;
        alert(`Clicked element ID: ${clickedElementId}`)
      }
​
      return (
        <div className='container'>
          <h3>React JS onClick event handler</h3>
         <button className="clickable-element" id="button1" onClick={handleClick}>
            Click me 1
          </button>
          <button className="clickable-element" id="button2" onClick={handleClick}>
            Click me 2
          </button>
        </div>
      );
    }
​
    ReactDOM.render(<App />, document.getElementById("app"));
  </script>
  <style>
    .container {
      text-align: center;
      padding: 20px;
      box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
      margin: 0 auto;
      max-width: 600px;
    }
  </style>
</body>
​
</html>