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<!-- index.html — minimal Vue 3 CDN setup --> <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <title>Hello Vue 3</title> </head> <body> <div id="app"> <h1>{{ message }}</h1> <button @click="greet">Say Hello</button> </div> <script type="module"> import { createApp, ref } from 'https://unpkg.com/vue@3/dist/vue.esm-browser.js'; createApp({ setup() { const message = ref('Welcome to Vue 3!'); function greet() { message.value = 'Hello from Vue 3 ' + new Date().getFullYear(); } return { message, greet }; } }).mount('#app'); </script> </body> </html>
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