The HTTP Content-Security-Policy (CSP) frame-src directive specifies valid sources for nested browsing contexts loading using elements such as <frame> and <iframe>.
| CSP version | 1 |
|---|---|
| Directive type | Fetch directive |
| Fallback | If this directive is absent, the user agent will look for the child-src directive (which falls back to the default-src directive). |
One or more sources can be allowed for the frame-src policy:
Content-Security-Policy: frame-src <source>; Content-Security-Policy: frame-src <source> <source>;
<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 fetch directives (and a number of other directives).
Given this CSP header:
Content-Security-Policy: frame-src https://example.com/
The following <iframe> is blocked and won't load:
<iframe src="https://not-example.com/"></iframe>
| Specification |
|---|
| Content Security Policy Level 3 # directive-frame-src |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
frame-src |
25 |
14 |
23 |
No |
15 |
7 |
Yes |
Yes |
23 |
No |
7 |
Yes |
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https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/frame-src