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+---
+title: 'CSP: child-src'
+slug: Web/HTTP/Headers/Content-Security-Policy/child-src
+translation_of: Web/HTTP/Headers/Content-Security-Policy/child-src
+---
+<div>{{HTTPSidebar}}</div>
+
+<p>The HTTP {{HTTPHeader("Content-Security-Policy")}} (CSP) <strong><code>child-src</code></strong> directive defines the valid sources for <a href="/en-US/docs/Web/API/Web_Workers_API">web workers</a> and nested <a id="002" name="002">browsing </a>contexts loaded using elements such as {{HTMLElement("frame")}} and {{HTMLElement("iframe")}}. For workers, non-compliant requests are treated as fatal network errors by the user agent.</p>
+
+<table class="properties">
+ <tbody>
+  <tr>
+   <th scope="row">CSP version</th>
+   <td>2</td>
+  </tr>
+  <tr>
+   <th scope="row">Directive type</th>
+   <td>{{Glossary("Fetch directive")}}</td>
+  </tr>
+  <tr>
+   <th scope="row">{{CSP("default-src")}} fallback</th>
+   <td>Yes. If this directive is absent, the user agent will look for the <code>default-src</code> directive.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Syntax">Syntax</h2>
+
+<p>One or more sources can be allowed for the child-src policy:</p>
+
+<pre class="syntaxbox">Content-Security-Policy: child-src &lt;source&gt;;
+Content-Security-Policy: child-src &lt;source&gt; &lt;source&gt;;
+</pre>
+
+<h3 id="Sources">Sources</h3>
+
+<p>{{page("Web/HTTP/Headers/Content-Security-Policy/connect-src", "Sources")}}</p>
+
+<h2 id="Examples">Examples</h2>
+
+<h3 id="Violation_cases">Violation cases</h3>
+
+<p>Given this CSP header:</p>
+
+<pre class="brush: bash">Content-Security-Policy: child-src https://example.com/</pre>
+
+<p>This {{HTMLElement("iframe")}} and worker are blocked and won't load:</p>
+
+<pre class="brush: html">&lt;iframe src="https://not-example.com"&gt;&lt;/iframe&gt;
+
+&lt;script&gt;
+  var blockedWorker = new Worker("data:application/javascript,...");
+&lt;/script&gt;</pre>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{specName("CSP 3.0", "#directive-child-src", "child-src")}}</td>
+   <td>{{Spec2('CSP 3.0')}}</td>
+   <td>No changes.</td>
+  </tr>
+  <tr>
+   <td>{{specName("CSP 1.1", "#directive-child-srci", "child-src")}}</td>
+   <td>{{Spec2('CSP 1.1')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("http.headers.csp.Content-Security-Policy.child-src")}}</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{HTTPHeader("Content-Security-Policy")}}</li>
+ <li>{{HTMLElement("frame")}} and {{HTMLElement("iframe")}}</li>
+ <li>{{domxref("Worker")}}, {{domxref("SharedWorker")}}, {{domxref("ServiceWorker")}}</li>
+</ul>