diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSValueID.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSValueID.cpp
index 1aa5067ea0..bc3d65ea96 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSValueID.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSValueID.cpp
@@ -71,10 +71,12 @@ Optional<ValueID> value_id_from_string(StringView);
 StringView string_from_value_id(ValueID);
 
 // https://www.w3.org/TR/css-values-4/#common-keywords
+// https://drafts.csswg.org/css-cascade-4/#valdef-all-revert
 inline bool is_css_wide_keyword(StringView name)
 {
     return name.equals_ignoring_ascii_case("inherit"sv)
         || name.equals_ignoring_ascii_case("initial"sv)
+        || name.equals_ignoring_ascii_case("revert"sv)
         || name.equals_ignoring_ascii_case("unset"sv);
 }
 
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValue.h b/Userland/Libraries/LibWeb/CSS/StyleValue.h
index 8ad3d80fc9..f7e3c49b26 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleValue.h
+++ b/Userland/Libraries/LibWeb/CSS/StyleValue.h
@@ -157,7 +157,9 @@ public:
     AbstractImageStyleValue const& as_abstract_image() const;
     AbstractImageStyleValue& as_abstract_image() { return const_cast<AbstractImageStyleValue&>(const_cast<StyleValue const&>(*this).as_abstract_image()); }
 
-    bool is_builtin() const { return is_inherit() || is_initial() || is_unset(); }
+    // https://www.w3.org/TR/css-values-4/#common-keywords
+    // https://drafts.csswg.org/css-cascade-4/#valdef-all-revert
+    bool is_css_wide_keyword() const { return is_inherit() || is_initial() || is_revert() || is_unset(); }
 
     bool has_auto() const;
     virtual bool has_color() const { return false; }