diff --git a/Userland/Libraries/LibWeb/HTML/CORSSettingAttribute.cpp b/Userland/Libraries/LibWeb/HTML/CORSSettingAttribute.cpp
index 6eee57613d..097a4cadf2 100644
--- a/Userland/Libraries/LibWeb/HTML/CORSSettingAttribute.cpp
+++ b/Userland/Libraries/LibWeb/HTML/CORSSettingAttribute.cpp
@@ -26,4 +26,24 @@ CORSSettingAttribute cors_setting_attribute_from_keyword(Optional<String> const&
     return CORSSettingAttribute::Anonymous;
 }
 
+// https://html.spec.whatwg.org/multipage/urls-and-fetching.html#cors-settings-attribute-credentials-mode
+Fetch::Infrastructure::Request::CredentialsMode cors_settings_attribute_credentials_mode(CORSSettingAttribute attribute)
+{
+    switch (attribute) {
+    // -> No CORS
+    // -> Anonymous
+    case CORSSettingAttribute::NoCORS:
+    case CORSSettingAttribute::Anonymous:
+        // "same-origin"
+        return Fetch::Infrastructure::Request::CredentialsMode::SameOrigin;
+
+    // -> Use Credentials
+    case CORSSettingAttribute::UseCredentials:
+        // "include"
+        return Fetch::Infrastructure::Request::CredentialsMode::Include;
+    }
+
+    VERIFY_NOT_REACHED();
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/HTML/CORSSettingAttribute.h b/Userland/Libraries/LibWeb/HTML/CORSSettingAttribute.h
index 5d60e13052..73ea94eeee 100644
--- a/Userland/Libraries/LibWeb/HTML/CORSSettingAttribute.h
+++ b/Userland/Libraries/LibWeb/HTML/CORSSettingAttribute.h
@@ -8,6 +8,7 @@
 
 #include <AK/Optional.h>
 #include <AK/String.h>
+#include <LibWeb/Fetch/Infrastructure/HTTP/Requests.h>
 
 namespace Web::HTML {
 
@@ -19,5 +20,6 @@ enum class CORSSettingAttribute {
 };
 
 [[nodiscard]] CORSSettingAttribute cors_setting_attribute_from_keyword(Optional<String> const& keyword);
+[[nodiscard]] Fetch::Infrastructure::Request::CredentialsMode cors_settings_attribute_credentials_mode(CORSSettingAttribute);
 
 }