diff --git a/Userland/Libraries/LibWeb/Bindings/CSSNamespace.cpp b/Userland/Libraries/LibWeb/Bindings/CSSNamespace.cpp
index 6bc57f8bb3..56507ed776 100644
--- a/Userland/Libraries/LibWeb/Bindings/CSSNamespace.cpp
+++ b/Userland/Libraries/LibWeb/Bindings/CSSNamespace.cpp
@@ -26,40 +26,35 @@ void CSSNamespace::initialize(JS::GlobalObject& global_object)
 {
     Object::initialize(global_object);
     u8 attr = JS::Attribute::Enumerable;
-    define_old_native_function("escape", escape, 1, attr);
-    define_old_native_function("supports", supports, 2, attr);
+    define_native_function("escape", escape, 1, attr);
+    define_native_function("supports", supports, 2, attr);
 }
 
 // https://www.w3.org/TR/cssom-1/#dom-css-escape
-JS_DEFINE_OLD_NATIVE_FUNCTION(CSSNamespace::escape)
+JS_DEFINE_NATIVE_FUNCTION(CSSNamespace::escape)
 {
-    if (!vm.argument_count()) {
-        vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::BadArgCountAtLeastOne, "CSS.escape");
-        return {};
-    }
-
-    auto identifier = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
+    if (!vm.argument_count())
+        return vm.throw_completion<JS::TypeError>(global_object, JS::ErrorType::BadArgCountAtLeastOne, "CSS.escape");
 
+    auto identifier = TRY(vm.argument(0).to_string(global_object));
     return JS::js_string(vm, Web::CSS::serialize_an_identifier(identifier));
 }
 
 // https://www.w3.org/TR/css-conditional-3/#dom-css-supports
-JS_DEFINE_OLD_NATIVE_FUNCTION(CSSNamespace::supports)
+JS_DEFINE_NATIVE_FUNCTION(CSSNamespace::supports)
 {
-    if (!vm.argument_count()) {
-        vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::BadArgCountAtLeastOne, "CSS.supports");
-        return {};
-    }
+    if (!vm.argument_count())
+        return vm.throw_completion<JS::TypeError>(global_object, JS::ErrorType::BadArgCountAtLeastOne, "CSS.supports");
 
     if (vm.argument_count() >= 2) {
         // When the supports(property, value) method is invoked with two arguments property and value:
-        auto property_name = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
+        auto property_name = TRY(vm.argument(0).to_string(global_object));
 
         // If property is an ASCII case-insensitive match for any defined CSS property that the UA supports,
         // and value successfully parses according to that property’s grammar, return true.
         auto property = CSS::property_id_from_string(property_name);
         if (property != CSS::PropertyID::Invalid) {
-            auto value_string = TRY_OR_DISCARD(vm.argument(1).to_string(global_object));
+            auto value_string = TRY(vm.argument(1).to_string(global_object));
             if (parse_css_value({}, value_string, property))
                 return JS::Value(true);
         }
@@ -73,7 +68,7 @@ JS_DEFINE_OLD_NATIVE_FUNCTION(CSSNamespace::supports)
         return JS::Value(false);
     } else {
         // When the supports(conditionText) method is invoked with a single conditionText argument:
-        auto supports_text = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
+        auto supports_text = TRY(vm.argument(0).to_string(global_object));
 
         // If conditionText, parsed and evaluated as a <supports-condition>, would return true, return true.
         if (auto supports = parse_css_supports({}, supports_text); supports && supports->matches())
diff --git a/Userland/Libraries/LibWeb/Bindings/CSSNamespace.h b/Userland/Libraries/LibWeb/Bindings/CSSNamespace.h
index 2a0942448a..2791c54580 100644
--- a/Userland/Libraries/LibWeb/Bindings/CSSNamespace.h
+++ b/Userland/Libraries/LibWeb/Bindings/CSSNamespace.h
@@ -21,8 +21,8 @@ public:
     virtual ~CSSNamespace() override;
 
 private:
-    JS_DECLARE_OLD_NATIVE_FUNCTION(escape);
-    JS_DECLARE_OLD_NATIVE_FUNCTION(supports);
+    JS_DECLARE_NATIVE_FUNCTION(escape);
+    JS_DECLARE_NATIVE_FUNCTION(supports);
 };
 
 }