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In the above code snippet you have not closed the script tag.
Code after closing the tag:
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<script src="https://cdn.jsdelivr.net/npm/vue"></script>
<title>Learning Vue.js</title>
</head>
<body>
<div id="app">
<input type="text" v-model="name" />
<p>Hello {{ name }}</p>
</div>
<script>
new Vue({
el: '#app',
data() {
return {
name: 'John'
};
}
});
</script>
</body>
</html>
Source:stackexchange.com