code: function onSortableSortedDefaultAnnouncement({dragEvent}) {
    const sourceText = dragEvent.source.textContent.trim() || dragEvent.source.id || 'sortable element';
  
    if (dragEvent.over) {
      const overText = dragEvent.over.textContent.trim() || dragEvent.over.id || 'sortable element';
      const isFollowing = dragEvent.source.compareDocumentPosition(dragEvent.over) & Node.DOCUMENT_POSITION_FOLLOWING;
  
      if (isFollowing) {
        return `Placed ${sourceText} after ${overText}`;
      } else {
        return `Placed ${sourceText} before ${overText}`;
      }
    } else {
      // need to figure out how to compute container name
      return `Placed ${sourceText} into a different container`;
    }
  }
docs: Returns announcement message when a Draggable element has been sorted with another Draggable element
  or moved into a new container
  @param {SortableSortedEvent} sortableEvent
  @return {String}