diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPropertyID.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPropertyID.cpp
index a74c875eee8..990091f222c 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPropertyID.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPropertyID.cpp
@@ -173,7 +173,7 @@ bool is_animatable_property(PropertyID);
 
 Optional<PropertyID> property_id_from_camel_case_string(StringView);
 Optional<PropertyID> property_id_from_string(StringView);
-StringView string_from_property_id(PropertyID);
+[[nodiscard]] FlyString const& string_from_property_id(PropertyID);
 bool is_inherited_property(PropertyID);
 NonnullRefPtr<StyleValue> property_initial_value(JS::Realm&, PropertyID);
 
@@ -401,7 +401,7 @@ Optional<PropertyID> property_id_from_string(StringView string)
     return {};
 }
 
-StringView string_from_property_id(PropertyID property_id) {
+FlyString const& string_from_property_id(PropertyID property_id) {
     switch (property_id) {
 )~~~");
 
@@ -412,14 +412,18 @@ StringView string_from_property_id(PropertyID property_id) {
         member_generator.set("name", name);
         member_generator.set("name:titlecase", title_casify(name));
         member_generator.append(R"~~~(
-    case PropertyID::@name:titlecase@:
-        return "@name@"sv;
+    case PropertyID::@name:titlecase@: {
+        static FlyString name = "@name@"_fly_string;
+        return name;
+    }
 )~~~");
     });
 
     generator.append(R"~~~(
-    default:
-        return "(invalid CSS::PropertyID)"sv;
+    default: {
+        static FlyString invalid_property_id_string = "(invalid CSS::PropertyID)"_fly_string;
+        return invalid_property_id_string;
+    }
     }
 }
 
diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.cpp b/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.cpp
index 5ebbe1c3689..a844b889e65 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.cpp
@@ -56,7 +56,7 @@ String PropertyOwningCSSStyleDeclaration::item(size_t index) const
 {
     if (index >= m_properties.size())
         return {};
-    return MUST(String::from_utf8(CSS::string_from_property_id(m_properties[index].property_id)));
+    return CSS::string_from_property_id(m_properties[index].property_id).to_string();
 }
 
 JS::NonnullGCPtr<ElementInlineCSSStyleDeclaration> ElementInlineCSSStyleDeclaration::create(DOM::Element& element, Vector<StyleProperty> properties, HashMap<FlyString, StyleProperty> custom_properties)
diff --git a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
index 3e14432385d..6fa8e7a79ed 100644
--- a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
@@ -7019,7 +7019,7 @@ static RefPtr<StyleValue const> get_custom_property(DOM::Element const& element,
     return nullptr;
 }
 
-bool Parser::expand_variables(DOM::Element& element, Optional<Selector::PseudoElement::Type> pseudo_element, StringView property_name, HashMap<FlyString, NonnullRefPtr<PropertyDependencyNode>>& dependencies, TokenStream<ComponentValue>& source, Vector<ComponentValue>& dest)
+bool Parser::expand_variables(DOM::Element& element, Optional<Selector::PseudoElement::Type> pseudo_element, FlyString const& property_name, HashMap<FlyString, NonnullRefPtr<PropertyDependencyNode>>& dependencies, TokenStream<ComponentValue>& source, Vector<ComponentValue>& dest)
 {
     // Arbitrary large value chosen to avoid the billion-laughs attack.
     // https://www.w3.org/TR/css-variables-1/#long-variables
@@ -7081,7 +7081,7 @@ bool Parser::expand_variables(DOM::Element& element, Optional<Selector::PseudoEl
         // but rebuilding it every time.
         if (custom_property_name == property_name)
             return false;
-        auto parent = get_dependency_node(MUST(FlyString::from_utf8(property_name)));
+        auto parent = get_dependency_node(property_name);
         auto child = get_dependency_node(custom_property_name);
         parent->add_child(child);
         if (parent->has_cycles())
@@ -7109,7 +7109,7 @@ bool Parser::expand_variables(DOM::Element& element, Optional<Selector::PseudoEl
     return true;
 }
 
-bool Parser::expand_unresolved_values(DOM::Element& element, StringView property_name, TokenStream<ComponentValue>& source, Vector<ComponentValue>& dest)
+bool Parser::expand_unresolved_values(DOM::Element& element, FlyString const& property_name, TokenStream<ComponentValue>& source, Vector<ComponentValue>& dest)
 {
     while (source.has_next_token()) {
         auto const& value = source.next_token();
@@ -7180,7 +7180,7 @@ bool Parser::expand_unresolved_values(DOM::Element& element, StringView property
 }
 
 // https://drafts.csswg.org/css-values-5/#attr-substitution
-bool Parser::substitute_attr_function(DOM::Element& element, StringView property_name, Function const& attr_function, Vector<ComponentValue>& dest)
+bool Parser::substitute_attr_function(DOM::Element& element, FlyString const& property_name, Function const& attr_function, Vector<ComponentValue>& dest)
 {
     // First, parse the arguments to attr():
     // attr() = attr( <q-name> <attr-type>? , <declaration-value>?)
diff --git a/Userland/Libraries/LibWeb/CSS/Parser/Parser.h b/Userland/Libraries/LibWeb/CSS/Parser/Parser.h
index d9b0b8a85cc..2f5c6276421 100644
--- a/Userland/Libraries/LibWeb/CSS/Parser/Parser.h
+++ b/Userland/Libraries/LibWeb/CSS/Parser/Parser.h
@@ -307,9 +307,9 @@ private:
     Optional<Supports::Feature> parse_supports_feature(TokenStream<ComponentValue>&);
 
     NonnullRefPtr<StyleValue> resolve_unresolved_style_value(DOM::Element&, Optional<Selector::PseudoElement::Type>, PropertyID, UnresolvedStyleValue const&);
-    bool expand_variables(DOM::Element&, Optional<Selector::PseudoElement::Type>, StringView property_name, HashMap<FlyString, NonnullRefPtr<PropertyDependencyNode>>& dependencies, TokenStream<ComponentValue>& source, Vector<ComponentValue>& dest);
-    bool expand_unresolved_values(DOM::Element&, StringView property_name, TokenStream<ComponentValue>& source, Vector<ComponentValue>& dest);
-    bool substitute_attr_function(DOM::Element& element, StringView property_name, Function const& attr_function, Vector<ComponentValue>& dest);
+    bool expand_variables(DOM::Element&, Optional<Selector::PseudoElement::Type>, FlyString const& property_name, HashMap<FlyString, NonnullRefPtr<PropertyDependencyNode>>& dependencies, TokenStream<ComponentValue>& source, Vector<ComponentValue>& dest);
+    bool expand_unresolved_values(DOM::Element&, FlyString const& property_name, TokenStream<ComponentValue>& source, Vector<ComponentValue>& dest);
+    bool substitute_attr_function(DOM::Element& element, FlyString const& property_name, Function const& attr_function, Vector<ComponentValue>& dest);
 
     static bool has_ignored_vendor_prefix(StringView);
 
diff --git a/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp b/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp
index c74cc760563..1e533efce86 100644
--- a/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp
+++ b/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp
@@ -79,7 +79,7 @@ String ResolvedCSSStyleDeclaration::item(size_t index) const
     if (index > length())
         return {};
     auto property_id = static_cast<PropertyID>(index + to_underlying(first_longhand_property_id));
-    return MUST(String::from_utf8(string_from_property_id(property_id)));
+    return string_from_property_id(property_id).to_string();
 }
 
 static NonnullRefPtr<StyleValue const> style_value_for_background_property(Layout::NodeWithStyle const& layout_node, Function<NonnullRefPtr<StyleValue const>(BackgroundLayerData const&)> callback, Function<NonnullRefPtr<StyleValue const>()> default_value)
diff --git a/Userland/Libraries/LibWeb/Dump.cpp b/Userland/Libraries/LibWeb/Dump.cpp
index 3f72ec1a584..48e67100b3b 100644
--- a/Userland/Libraries/LibWeb/Dump.cpp
+++ b/Userland/Libraries/LibWeb/Dump.cpp
@@ -384,12 +384,12 @@ void dump_tree(StringBuilder& builder, Layout::Node const& layout_node, bool sho
 
     if (show_specified_style && layout_node.dom_node() && layout_node.dom_node()->is_element() && verify_cast<DOM::Element>(layout_node.dom_node())->computed_css_values()) {
         struct NameAndValue {
-            String name;
+            FlyString name;
             String value;
         };
         Vector<NameAndValue> properties;
         verify_cast<DOM::Element>(*layout_node.dom_node()).computed_css_values()->for_each_property([&](auto property_id, auto& value) {
-            properties.append({ MUST(String::from_utf8(CSS::string_from_property_id(property_id))), value.to_string() });
+            properties.append({ CSS::string_from_property_id(property_id), value.to_string() });
         });
         quick_sort(properties, [](auto& a, auto& b) { return a.name < b.name; });