Fence

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

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

The Fence interface of the Fenced Frame API contains several functions relevant to <fencedframe> functionality.

Fence objects are accessed through the Window.fence property, but they are only available to documents embedded inside <fencedframe>s (loaded via FencedFrameConfigs) or <iframe>s (loaded via opaque URNs).

Note: See How do <fencedframe>s work? for some description around FencedFrameConfigs and opaque URNs.

Instance methods

getNestedConfigs()

Returns the FencedFrameConfigs loaded into <fencedframe>s embedded inside the current <fencedframe>.

reportEvent()

Triggers the submission of report data via a beacon to one ore more specific URLs registered via the registerAdBeacon() method of the Protected Audience API, for the purpose of collecting ad auction results.

setReportEventDataForAutomaticBeacons()

Specifies event data that will be sent when a navigation occurs inside a <fencedframe>. This data will be sent via an automatic beacon to one or more specific URLs registered via the registerAdBeacon() method of the Protected Audience API, for the purpose of collecting reporting data for ad auction results.

Examples

js
window.fence.reportEvent({
  eventType: "click",
  eventData: JSON.stringify({ clickX: "123", clickY: "456" }),
  destination: ["buyer", "seller"],
});

Specifications

Specification
Fenced Frame
# fence-interface

Browser compatibility

desktop mobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Fence
Experimental
Chrome – Full support
Chrome 126 (Release date: 2024-06-11)
footnote Full support
Edge – Full support
Edge 126 (Release date: 2024-06-13)
footnote Full support
Firefox – No support
Firefox
footnote No support
Opera – Full support
Opera 112 (Release date: 2024-07-11)
footnote Full support
Safari – No support
Safari
footnote No support
Chrome Android – Full support
Chrome Android 126 (Release date: 2024-06-11)
footnote Full support
Firefox for Android – No support
Firefox for Android
footnote No support
Opera Android – Full support
Opera Android 83 (Release date: 2024-06-25)
footnote Full support
Safari on iOS – No support
Safari on iOS
footnote No support
Samsung Internet – Full support
Samsung Internet 28 (Release date: 2025-04-02)
footnote Full support
WebView Android – Full support
WebView Android 126 (Release date: 2024-06-11)
footnote Full support
WebView on iOS – No support
WebView on iOS
footnote No support
getNestedConfigs
Experimental
Chrome – Full support
Chrome 126 (Release date: 2024-06-11)
footnote Full support
Edge – Full support
Edge 126 (Release date: 2024-06-13)
footnote Full support
Firefox – No support
Firefox
footnote No support
Opera – Full support
Opera 112 (Release date: 2024-07-11)
footnote Full support
Safari – No support
Safari
footnote No support
Chrome Android – Full support
Chrome Android 126 (Release date: 2024-06-11)
footnote Full support
Firefox for Android – No support
Firefox for Android
footnote No support
Opera Android – Full support
Opera Android 83 (Release date: 2024-06-25)
footnote Full support
Safari on iOS – No support
Safari on iOS
footnote No support
Samsung Internet – Full support
Samsung Internet 28 (Release date: 2025-04-02)
footnote Full support
WebView Android – Full support
WebView Android 126 (Release date: 2024-06-11)
footnote Full support
WebView on iOS – No support
WebView on iOS
footnote No support
reportEvent
Experimental
Chrome – Full support
Chrome 126 (Release date: 2024-06-11)
footnote Full support
Edge – Full support
Edge 126 (Release date: 2024-06-13)
footnote Full support
Firefox – No support
Firefox
footnote No support
Opera – Full support
Opera 112 (Release date: 2024-07-11)
footnote Full support
Safari – No support
Safari
footnote No support
Chrome Android – Full support
Chrome Android 126 (Release date: 2024-06-11)
footnote Full support
Firefox for Android – No support
Firefox for Android
footnote No support
Opera Android – Full support
Opera Android 83 (Release date: 2024-06-25)
footnote Full support
Safari on iOS – No support
Safari on iOS
footnote No support
Samsung Internet – Full support
Samsung Internet 28 (Release date: 2025-04-02)
footnote Full support
WebView Android – Full support
WebView Android 126 (Release date: 2024-06-11)
footnote Full support
WebView on iOS – No support
WebView on iOS
footnote No support
setReportEventDataForAutomaticBeacons
Experimental
Chrome – Full support
Chrome 126 (Release date: 2024-06-11)
footnote Full support
Edge – Full support
Edge 126 (Release date: 2024-06-13)
footnote Full support
Firefox – No support
Firefox
footnote No support
Opera – Full support
Opera 112 (Release date: 2024-07-11)
footnote Full support
Safari – No support
Safari
footnote No support
Chrome Android – Full support
Chrome Android 126 (Release date: 2024-06-11)
footnote Full support
Firefox for Android – No support
Firefox for Android
footnote No support
Opera Android – Full support
Opera Android 83 (Release date: 2024-06-25)
footnote Full support
Safari on iOS – No support
Safari on iOS
footnote No support
Samsung Internet – Full support
Samsung Internet 28 (Release date: 2025-04-02)
footnote Full support
WebView Android – Full support
WebView Android 126 (Release date: 2024-06-11)
footnote Full support
WebView on iOS – No support
WebView on iOS
footnote No support

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.

See also