example mutation observer

<!-- https://developer.mozilla.org/pt-BR/docs/Web/API/MutationObserver -->
<ion-content>
  <div>
    <message *ngFor></message>
  </div>
</ion-content>


<script>
  const llist = null;
  const obs = new MutationObserver(() => {
    // scroll
  })
  
  obs.observe(llist, {
    childList: true,
  })
</script>