Preview:
<script type="text/javascript">
const pacificoObserver = new FontFaceObserver('Pacifico');
const robotoObserver = new FontFaceObserver('Roboto');

Promise.all([
  pacificoObserver.load(),
  robotoObserver.load()
]).then(function(){
  /* Do things */
  document.documentElement.className += " fonts-loaded";
});
</script>
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