Window: fence property

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 read-only property of the Window interface returns a Fence object instance for the current document context.

Fence objects 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.

Value

A Fence object instance, or null if the document context does not have access to a Fence object.

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

Specification
Fenced Frame # dom-window-fence

This page was last modified on Apr 4, 2025 by MDN contributors.