Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The HTMLFencedFrameElement interface represents a <fencedframe> element in JavaScript and provides configuration properties.

EventTarget Node Element HTMLElement HTMLFencedFrameElement

Instance properties

Inherits properties from its parent, HTMLElement.

HTMLFencedFrameElement.allow Experimental

Gets and sets the value of the corresponding <fencedframe> allow attribute, which represents a Permissions Policy applied to the content when it is first embedded.

HTMLFencedFrameElement.config Experimental

a FencedFrameConfig object, which represents the navigation of a <fencedframe>, i.e. what content will be displayed in it. A FencedFrameConfig is returned from a source such as the Protected Audience API.

HTMLFencedFrameElement.height Experimental

Gets and sets the value of the corresponding <fencedframe> height attribute, which specifies the height of the element.

HTMLFencedFrameElement.width Experimental

Gets and sets the value of the corresponding <fencedframe> width attribute, which specifies the width of the element.


To set what content will be shown in a <fencedframe>, a utilizing API (such as Protected Audience or Shared Storage) generates a FencedFrameConfig object, which is then set as the value of the <fencedframe>'s config property.

The following example gets a FencedFrameConfig from a Protected Audience API's ad auction, which is then used to display the winning ad in a <fencedframe>:

const frameConfig = await navigator.runAdAuction({
  // configuration
  resolveToConfig: true,

const frame = document.createElement("fencedframe");
frame.config = frameConfig;

Note: resolveToConfig: true must be passed in to the runAdAuction() call to obtain a FencedFrameConfig object. If it is not set, the resulting Promise will resolve to a URN that can only be used in an <iframe>.


Fenced Frame
# htmlfencedframeelement

Browser compatibility

BCD tables only load in the browser

See also