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html/elements/iframe: add local-network, local-network-access, and loopback-network allow directives - #30833

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BHUVANSH855:fix-30831
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BHUVANSH855:fix-30831

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Fixes #30831

Adds three missing Permission Policy directive entries to html.elements.iframe.allow:

  • local-network: Chrome 145, Firefox 153, experimental: false
  • loopback-network: Chrome 145, Firefox 153, experimental: false
  • local-network-access: Chrome 142, Firefox false, experimental: true (legacy alias, superseded by the two above)

Firefox support verified via Bugzilla bug 1978550 (RESOLVED FIXED); network.lna.blocking defaults to true from the Firefox 153 release tag.

Note: http.headers.Permissions-Policy entries for these directives correctly remain false — Firefox has not implemented HTTP header parsing for Permissions-Policy (bug 1531012 is still open).

@github-actions github-actions Bot added data:html Compatibility data for HTML features. https://developer.mozilla.org/docs/Web/HTML size:l Pull request changing 101-1,000 lines of code. labels Oct 10, 2026
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Tip: Review these changes grouped by change (recommended for most PRs), or grouped by feature (for large PRs).

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data:html Compatibility data for HTML features. https://developer.mozilla.org/docs/Web/HTML size:l Pull request changing 101-1,000 lines of code.

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html.elements.iframe.allow: missing local-network, local-network-access, and loopback-network entries

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