DocumentFragment: lastElementChild property
  The DocumentFragment.lastElementChild read-only property
  returns the document fragment's last child Element, or null if there
  are no child elements.
Value
An Element that is the last child Element of the object, or null if there are none.
Examples
js
let fragment = new DocumentFragment();
fragment.lastElementChild; // null
let paragraph = document.createElement("p");
fragment.appendChild(paragraph);
fragment.lastElementChild; // <p>
Specifications
| Specification | 
|---|
| DOM Standard  # ref-for-dom-parentnode-lastelementchild①  | 
Browser compatibility
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