<fencedframe>
An iframe variant with the communication channel cut — the embedder can load content but never learn what was shown.
Experimental — limited availability · Media & embedded content
When to use it
Privacy Sandbox ad slots chosen by Protected Audience auctions or Shared Storage; the config is set via JavaScript, never a URL.
When not to
Chromium-only and experimental; for any general embedding use iframe.
Key attributes
width / heightallow- Privacy Sandbox policies only
title- accessible name
Example
<fencedframe width='640' height='320' title='Advertisement, selected privately'></fencedframe>