docs/Web/HTTP/Headers/Content-Security-Policy/child-src) directive).   
  
##  Syntax

One or more sources can be allowed for the ` fenced-frame-src ` policy:

http

    
    
    Content-Security-Policy: fenced-frame-src <source>;
    Content-Security-Policy: fenced-frame-src <source> <source>;
    

###  Sources

` <source> ` s for ` fenced-frame-src ` are more limited than for [ ` frame-
src ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/frame-src) . Only
the following source expressions can be used:

  * The scheme-source ` "https:" `
  * The host-source ` "https://*:*" `
  * The string ` "*" `

**Note:** See the full list of [ CSP Source Values ](/en-
US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources#sources) .

##  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

Specification  
---  
[ Fenced Frame  
#  new-csp-directive  ](https://wicg.github.io/fenced-frame/#new-csp-
directive)  
  
##  Browser compatibility

BCD tables only load in the browser  with JavaScript enabled. Enable
JavaScript to view data.

##  See also

  * [ Fenced Frame API ](/en-US/docs/Web/API/Fenced_frame_API)
  * [ ` <fencedframe> ` ](/en-US/docs/Web/HTML/Element/fencedframe)
  * [ ` Content-Security-Policy ` ](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy)

##  Help improve MDN

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