index.md

---

title: "CSP: font-src"
slug: Web/HTTP/Headers/Content-Security-Policy/font-src
browser-compat: http.headers.Content-Security-Policy.font-src

---

{{HTTPSidebar}}

The HTTP {{HTTPHeader("Content-Security-Policy")}} (CSP) font-src directive specifies valid sources for fonts loaded using {{cssxref("@font-face")}}.

CSP version	1
Directive type	{{Glossary("Fetch directive")}}
{{CSP("default-src")}} fallback	Yes. If this directive is absent, the user agent will look for the default-src directive.

Syntax

One or more sources can be allowed for the font-src policy:

Content-Security-Policy: font-src <source>;
Content-Security-Policy: font-src <source> <source>;

Sources

<source> can be any one of the values listed in CSP Source Values.

Note that this same set of values can be used in all {{Glossary("fetch directive", "fetch directives")}} (and a number of other directives).

Examples

Violation cases

Given this CSP header:

Content-Security-Policy: font-src https://example.com/

The following font resource loading is blocked and won't load:

<style>
  @font-face {
    font-family: "MyFont";
    src: url("https://not-example.com/font");
  }
  body {
    font-family: "MyFont";
  }
</style>

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• {{HTTPHeader("Content-Security-Policy")}}

• {{cssxref("@font-face")}}