screen_rotation
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<!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://cdn.jsdelivr.net/npm/@babel/standalone@7.14.6/babel.min.js"></script> </head> <body> <div id="app"></div> <script type="text/babel" data-presets="env,react"> function App() { const showAlert = () => { window.alert("Button clicked!"); }; return ( <div> <h3>React Js Show alert on click button </h3> <button onClick={showAlert}>Click me</button> </div> ); } ReactDOM.render(<App />, document.getElementById("app")); </script> </body> </html>