<!-- BEGIN COPY / PASTE -->
        // React
        import React from 'react';
        import ReactDOM from 'react-dom';

        function App() {
            return <h1>Hello, React!</h1>;
        }

        ReactDOM.render(<App />, document.getElementById('root'));

        // Vue
        const app = Vue.createApp({
            data() {
                return { message: 'Hello, Vue!' }
            },
            template: '<h1>{{ message }}</h1>'
        });
        app.mount('#app');

        // Angular
        import { Component } from '@angular/core';

        @Component({
            selector: 'app-root',
            template: '<h1>Hello, Angular!</h1>'
        })
        export class AppComponent {}
        <!-- END COPY / PASTE -->