index.html

<!DOCTYPE html>
<html>
<head>
    <title>Testing Vue</title>
</head>
<body>

<div id="app">
    <h1>Testing Vue with x templates</h1>

    <hello-world></hello-world>

    <hr>

    <second-test></second-test>

</div>

<script src="https://cdn.jsdelivr.net/npm/vue@2.5.16/dist/vue.js"></script>
<script src="components.js"></script>

<!-- All Templates for components down here -->
<script type="text/x-template" id="hello-world-template">
    <div>
        <p>Reactive: {{ inputTesting }}</p>
        <input v-model="inputTesting" type="text" placeholder="Type in me">
    </div>
</script>

<!-- Template #2 -->
<script type="text/x-template" id="second-test-template">
    <div>
        <p>{{ domData }}</p>
        <p>
            <button @click.stop.prevent="putInDom">Push Me</button>
        </p>
    </div>
</script>

<script src="app.js"></script>

</body>
</html>