CSP: child-src
The HTTP Content-Security-Policy (CSP)
child-src directive defines the valid sources for web workers and nested browsing
contexts loaded using elements such as <frame> and
<iframe>. For workers, non-compliant requests are treated as fatal
network errors by the user agent.
| CSP version | 2 |
|---|---|
| Directive type | Fetch directive |
default-src fallback |
Yes. If this directive is absent, the user agent will look for the
default-src directive.
|
Syntax
http
Content-Security-Policy: child-src 'none';
Content-Security-Policy: child-src <source-expression-list>;
This directive may have one of the following values:
'none'-
No resources of this type may be loaded. The single quotes are mandatory.
<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: child-src https://example.com/
This <iframe> and worker are blocked and won't load:
html
<iframe src="https://not-example.com"></iframe>
<script>
const blockedWorker = new Worker("data:application/javascript,…");
</script>