diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/Environments.h b/Userland/Libraries/LibWeb/HTML/Scripting/Environments.h
index f846f30218..551c18f53e 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/Environments.h
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/Environments.h
@@ -77,7 +77,8 @@ struct EnvironmentSettingsObject
     // https://html.spec.whatwg.org/multipage/webappapis.html#concept-settings-object-origin
     virtual Origin origin() = 0;
 
-    // FIXME: A policy container https://html.spec.whatwg.org/multipage/webappapis.html#concept-settings-object-policy-container
+    // A policy container https://html.spec.whatwg.org/multipage/webappapis.html#concept-settings-object-policy-container
+    virtual PolicyContainer policy_container() = 0;
 
     // https://html.spec.whatwg.org/multipage/webappapis.html#concept-settings-object-cross-origin-isolated-capability
     virtual CanUseCrossOriginIsolatedAPIs cross_origin_isolated_capability() = 0;
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.cpp b/Userland/Libraries/LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.cpp
index 94e861c64b..4d78bfb3e6 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.cpp
@@ -108,6 +108,13 @@ Origin WindowEnvironmentSettingsObject::origin()
     return m_window->associated_document().origin();
 }
 
+// https://html.spec.whatwg.org/multipage/window-object.html#script-settings-for-window-objects:concept-settings-object-policy-container
+PolicyContainer WindowEnvironmentSettingsObject::policy_container()
+{
+    // Return the policy container of window's associated Document.
+    return m_window->associated_document().policy_container();
+}
+
 // https://html.spec.whatwg.org/multipage/window-object.html#script-settings-for-window-objects:concept-settings-object-cross-origin-isolated-capability
 CanUseCrossOriginIsolatedAPIs WindowEnvironmentSettingsObject::cross_origin_isolated_capability()
 {
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.h b/Userland/Libraries/LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.h
index 47c25d9e85..f743d9a81f 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.h
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.h
@@ -23,6 +23,7 @@ public:
     virtual String api_url_character_encoding() override;
     virtual AK::URL api_base_url() override;
     virtual Origin origin() override;
+    virtual PolicyContainer policy_container() override;
     virtual CanUseCrossOriginIsolatedAPIs cross_origin_isolated_capability() override;
 
 private:
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.h b/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.h
index e2e2ba6dc9..8226d2557d 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.h
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.h
@@ -46,12 +46,14 @@ public:
     String api_url_character_encoding() override { return m_api_url_character_encoding; }
     AK::URL api_base_url() override { return m_url; }
     Origin origin() override { return m_origin; }
+    PolicyContainer policy_container() override { return m_policy_container; }
     CanUseCrossOriginIsolatedAPIs cross_origin_isolated_capability() override { TODO(); }
 
 private:
     String m_api_url_character_encoding;
     AK::URL m_url;
     HTML::Origin m_origin;
+    HTML::PolicyContainer m_policy_container;
 };
 
 }