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2 changes: 1 addition & 1 deletion fern/products/docs/pages/customization/embedded-mode.mdx
Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,7 @@ Add the `embedded=true` query parameter to the URL:
></iframe>
```

Embedded mode persists across navigation within a session, so internal links keep it active without the query string on every URL.
Embedded mode persists across navigation within a session, so internal links keep it active without the query string on every URL. `?embedded=true` is also required for the embed to work on third-party domains: without it, the page's `frame-ancestors` Content-Security-Policy restricts embedding to `*.buildwithfern.com` hosts, and browsers will block the iframe on any other domain.

## Embed external pages

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