diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.cpp b/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.cpp
index 2735778f1d..d970b6fa78 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.cpp
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2019-2022, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2024, Tim Ledbetter <timledbetter@gmail.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h b/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h
index e7760d76e5..ae1601bfc6 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2019-2021, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2024, Tim Ledbetter <timledbetter@gmail.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -28,6 +29,8 @@ public:
 
     virtual ~CSSStyleSheet() override = default;
 
+    JS::GCPtr<CSSRule const> owner_rule() const { return m_owner_css_rule; }
+    JS::GCPtr<CSSRule> owner_rule() { return m_owner_css_rule; }
     void set_owner_css_rule(CSSRule* rule) { m_owner_css_rule = rule; }
 
     virtual String type() const override { return "text/css"_string; }
diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.idl b/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.idl
index 265a8b08be..c71ea64852 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.idl
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.idl
@@ -7,7 +7,7 @@
 interface CSSStyleSheet : StyleSheet {
     // FIXME: constructor(optional CSSStyleSheetInit options = {});
 
-    // FIXME: readonly attribute CSSRule? ownerRule;
+    readonly attribute CSSRule? ownerRule;
     [SameObject] readonly attribute CSSRuleList cssRules;
     unsigned long insertRule(CSSOMString rule, optional unsigned long index = 0);
     undefined deleteRule(unsigned long index);