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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/Fence/getNestedConfigs below:

Fence: getNestedConfigs() method - Web APIs

Limited availability

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>.

None.

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).

// 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];

• Fenced frames on privacysandbox.google.com
• The Privacy Sandbox on privacysandbox.google.com

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