Lazyload DOM fragment with AlpineJS + Unpoly

fragment.twig

<div up-id="replace-me-lazy">
  Hello, world!
</div>

index.twig

<!-- onload, will be replaced with contents from `/fragment` -->
<div up-id="replace-me-lazy"
     x-data
     x-init="up.render({ target: '[up-id=replace-me-lazy]', url: '/fragment' })">
     <!-- placeholder content can go here -->
</div>

Ensure that a DOM element with up-id="replace-me-lazy" is present in both the initial page response, and the fragment response.