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<!DOCTYPE html>
<html>
<head>
  <title>My first Vue page</title>
  <style>
    #app {
      display: inline-block;
      padding: 10px;
      font-size: x-large;
      background-color: lightgreen;
    }
  </style>
</head>
<body>
<h1>Vue Example</h1>
<p>The message is taken from 'data' inside the Vue instance by writing {{ message }} inside the div with id="app".</p>
<div id="app">
  {{ message }}
</div>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
<script>
  const app = Vue.createApp({
   data() {
    return {
     message: "Hello World!"
    }
   }
  })
  
  app.mount('#app')
</script>
</body>
</html>