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<!DOCTYPE html>
<html>
<head>
  <title>The template configuration option</title>
  <style>
    #app {
      display: inline-block;
      padding: 10px;
      font-size: x-large;
      background-color: lightgreen;
    }
  </style>
</head>
<body>
<h1>'template' Example</h1>
<p>All HTML code from inside the div tag with id="app" is moved inside the 'template' configuration option, in backtick quotes.</p>
<div id="app"></div>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
<script>
  const app = Vue.createApp({
    template: 
    `<h1>{{ message }}</h1>
    <p>This is a second line of HTML code, inside backtick quotes</p>`,
    data() {
      return {
      message: "Hello World!"
      }
    }
  })
  
  app.mount('#app')
</script>
</body>
</html>