DocumentFragment in JavaScript

  • Lightweight version of Document.
  • Not part of active document tree structure (has no parent in active document).
  • Stores nodes like standard document, but changes made in fragment don't affect active document (no performance impact when changes made to fragment), even on reflow.

Common Usage

  • Create a DocumentFragment and assemble DOM subtree in it.
  • Append fragment to active document using methods like appendChild() or insertBefore().
  • All nodes in fragment inserted into the document only once, therefore only one reflow and render is required.
  • Moving fragment's nodes into active document leaves behind empty fragment.