index.html

<template id="foo">
  Hello {{one}}
  <p title="{{two}}">Suddenly potatoes</p>
  <div>
    {{three}}
  </div>

  <div>There is a potato {{four}}<p>Hello world!</p></div>
  <p title="A {{five}} combined {{six}} string">{{seven}} and {{eight}} foo</p>
</template>

<script type="module">
  import createInstance from './createInstance.js'

  const instance = createInstance(foo)

  document.body.appendChild(instance)

  window.instance = instance
</script>