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Content-Security-Policy: fenced-frame-src directive

files/en-us/web/http/reference/headers/content-security-policy/fenced-frame-src/index.md

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{{SeeCompatTable}}

The HTTP {{HTTPHeader("Content-Security-Policy")}} (CSP) fenced-frame-src directive specifies valid sources for nested browsing contexts loaded into {{HTMLElement("fencedframe")}} elements.

<table class="properties"> <tbody> <tr> <th scope="row">CSP version</th> <td>1</td> </tr> <tr> <th scope="row">Directive type</th> <td>{{Glossary("Fetch directive")}}</td> </tr> <tr> <th scope="row">Fallback</th> <td> If this directive is absent, the user agent will look for the {{CSP("frame-src")}} directive (which falls back to the {{CSP("child-src")}} directive). </td> </tr> </tbody> </table>

Syntax

http
Content-Security-Policy: fenced-frame-src <source-expression-list>;
  • <source-expression-list>
    • : A space-separated list of source expression values. Resources of this type may be loaded if they match any of the given source expressions. For this directive, the following source expression values are applicable:

Examples

Violation cases

Given this CSP header:

http
Content-Security-Policy: fenced-frame-src https://example.com/

The following sources will not load in a fenced frame:

  • https://not-example.com/ (domain doesn't match)
  • https://example.org/ (TLD doesn't match)

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

  • Fenced Frame API
  • {{HTMLElement("fencedframe")}}
  • {{HTTPHeader("Content-Security-Policy")}}