Fence: getNestedConfigs() method

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 getNestedConfigs() method of the Fence interface returns the FencedFrameConfigs loaded into <fencedframe>s embedded inside the current <fencedframe>.

Syntax

js
getNestedConfigs()

Parameters

None.

Return value

getNestedConfigs() has two possible return values:

  • An array of 20 FencedFrameConfig objects, if the current <fencedframe>'s config was created using an API that supports nested configs (for example Protected Audience). Of these 20 configs, the first N configs are those registered through the API and the rest are padding configs that will navigate to about:blank, so that the number of configs is hidden and cannot leak any information.
  • null if the current <fencedframe>'s config was created using an API that does not support nested configs (for example Shared Storage).

Examples

js
// Run inside a <fencedframe>

// Retrieve the configs of embedded fenced frames
const configs = window.fence.getNestedConfigs();

// Set a new fenced frame's config to equal one of the retrieved configs
const frame = document.createElement("fencedframe");
frame.config = configs[0];

Specifications

Specification
Fenced Frame
# dom-fence-getnestedconfigs

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
getNestedConfigs
Experimental

Legend

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

See also