diff --git a/Userland/Libraries/LibWeb/HTML/CrossOrigin/CrossOriginOpenerPolicy.h b/Userland/Libraries/LibWeb/HTML/CrossOrigin/CrossOriginOpenerPolicy.h
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+++ b/Userland/Libraries/LibWeb/HTML/CrossOrigin/CrossOriginOpenerPolicy.h
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+/*
+ * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+namespace Web::HTML {
+
+// https://html.spec.whatwg.org/multipage/origin.html#cross-origin-opener-policy-value
+enum class CrossOriginOpenerPolicyValue {
+    UnsafeNone,
+    SameOriginAllowPopups,
+    SameOrigin,
+    SameOriginPlusCOEP,
+};
+
+// https://html.spec.whatwg.org/multipage/origin.html#cross-origin-opener-policy
+struct CrossOriginOpenerPolicy {
+    // A value, which is a cross-origin opener policy value, initially "unsafe-none".
+    CrossOriginOpenerPolicyValue value { CrossOriginOpenerPolicyValue::UnsafeNone };
+
+    // A reporting endpoint, which is string or null, initially null.
+    Optional<String> reporting_endpoint;
+
+    // A report-only value, which is a cross-origin opener policy value, initially "unsafe-none".
+    CrossOriginOpenerPolicyValue report_only_value { CrossOriginOpenerPolicyValue::UnsafeNone };
+
+    // A report-only reporting endpoint, which is a string or null, initially null.
+    Optional<String> report_only_reporting_endpoint;
+};
+
+}