diff --git a/AK/SourceGenerator.h b/AK/SourceGenerator.h
index 8c7384616d..972a22bd03 100644
--- a/AK/SourceGenerator.h
+++ b/AK/SourceGenerator.h
@@ -44,14 +44,13 @@ public:
         return SourceGenerator { m_builder, TRY(m_mapping.clone()), m_opening, m_closing };
     }
 
-    ErrorOr<void> set(StringView key, String value)
+    void set(StringView key, String value)
     {
         if (key.contains(m_opening) || key.contains(m_closing)) {
             warnln("SourceGenerator keys cannot contain the opening/closing delimiters `{}` and `{}`. (Keys are only wrapped in these when using them, not when setting them.)", m_opening, m_closing);
             VERIFY_NOT_REACHED();
         }
-        TRY(m_mapping.try_set(key, move(value)));
-        return {};
+        m_mapping.set(key, move(value));
     }
 
     String get(StringView key) const
@@ -101,9 +100,9 @@ public:
     }
 
     template<size_t N>
-    ErrorOr<void> set(char const (&key)[N], String value)
+    void set(char const (&key)[N], String value)
     {
-        return set(StringView { key, N - 1 }, value);
+        set(StringView { key, N - 1 }, value);
     }
 
     template<size_t N>
@@ -121,7 +120,7 @@ public:
     // FIXME: These are deprecated.
     void set(StringView key, DeprecatedString value)
     {
-        MUST(set(key, MUST(String::from_deprecated_string(value))));
+        set(key, MUST(String::from_deprecated_string(value)));
     }
     template<size_t N>
     void set(char const (&key)[N], DeprecatedString value)
diff --git a/Meta/Lagom/Tools/CodeGenerators/LibUnicode/GenerateUnicodeData.cpp b/Meta/Lagom/Tools/CodeGenerators/LibUnicode/GenerateUnicodeData.cpp
index 479c969a45..196410a50b 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibUnicode/GenerateUnicodeData.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibUnicode/GenerateUnicodeData.cpp
@@ -891,8 +891,8 @@ static ErrorOr<void> generate_unicode_data_implementation(Core::InputBufferedFil
     generator.set("special_casing_size", DeprecatedString::number(unicode_data.special_casing.size()));
     generator.set("case_folding_size", DeprecatedString::number(unicode_data.case_folding.size()));
 
-    TRY(generator.set("CODE_POINT_TABLES_LSB_COUNT", TRY(String::number(CODE_POINT_TABLES_LSB_COUNT))));
-    TRY(generator.set("CODE_POINT_TABLES_LSB_MASK", TRY(String::formatted("{:#x}", CODE_POINT_TABLES_LSB_MASK))));
+    generator.set("CODE_POINT_TABLES_LSB_COUNT", TRY(String::number(CODE_POINT_TABLES_LSB_COUNT)));
+    generator.set("CODE_POINT_TABLES_LSB_MASK", TRY(String::formatted("{:#x}", CODE_POINT_TABLES_LSB_MASK)));
 
     generator.append(R"~~~(
 #include <AK/Array.h>
@@ -1092,8 +1092,8 @@ static constexpr Array<@mapping_type@, @size@> s_@name@_mappings { {
     append_code_point_mappings("decomposition"sv, "CodePointDecompositionRaw"sv, unicode_data.code_points_with_decomposition_mapping, [](auto const& data) { return data.decomposition_mapping; });
 
     auto append_casing_table = [&](auto collection_snake, auto const& unique_properties) -> ErrorOr<void> {
-        TRY(generator.set("name", TRY(String::formatted("{}_unique_properties", collection_snake))));
-        TRY(generator.set("size", TRY(String::number(unique_properties.size()))));
+        generator.set("name", TRY(String::formatted("{}_unique_properties", collection_snake)));
+        generator.set("size", TRY(String::number(unique_properties.size())));
 
         auto optional_code_point_to_string = [](auto const& code_point) -> ErrorOr<String> {
             if (!code_point.has_value())
@@ -1110,14 +1110,14 @@ static constexpr Array<@mapping_type@, @size@> s_@name@_mappings { {
 static constexpr Array<CasingTable, @size@> @name@ { {)~~~");
 
         for (auto const& casing : unique_properties) {
-            TRY(generator.set("canonical_combining_class", TRY(String::number(casing.canonical_combining_class))));
-            TRY(generator.set("simple_uppercase_mapping", TRY(optional_code_point_to_string(casing.simple_uppercase_mapping))));
-            TRY(generator.set("simple_lowercase_mapping", TRY(optional_code_point_to_string(casing.simple_lowercase_mapping))));
-            TRY(generator.set("simple_titlecase_mapping", TRY(optional_code_point_to_string(casing.simple_titlecase_mapping))));
-            TRY(generator.set("special_casing_start_index", TRY(first_index_to_string(casing.special_casing_indices))));
-            TRY(generator.set("special_casing_size", TRY(String::number(casing.special_casing_indices.size()))));
-            TRY(generator.set("case_folding_start_index", TRY(first_index_to_string(casing.case_folding_indices))));
-            TRY(generator.set("case_folding_size", TRY(String::number(casing.case_folding_indices.size()))));
+            generator.set("canonical_combining_class", TRY(String::number(casing.canonical_combining_class)));
+            generator.set("simple_uppercase_mapping", TRY(optional_code_point_to_string(casing.simple_uppercase_mapping)));
+            generator.set("simple_lowercase_mapping", TRY(optional_code_point_to_string(casing.simple_lowercase_mapping)));
+            generator.set("simple_titlecase_mapping", TRY(optional_code_point_to_string(casing.simple_titlecase_mapping)));
+            generator.set("special_casing_start_index", TRY(first_index_to_string(casing.special_casing_indices)));
+            generator.set("special_casing_size", TRY(String::number(casing.special_casing_indices.size())));
+            generator.set("case_folding_start_index", TRY(first_index_to_string(casing.case_folding_indices)));
+            generator.set("case_folding_size", TRY(String::number(casing.case_folding_indices.size())));
 
             generator.append(R"~~~(
     { @canonical_combining_class@, @simple_uppercase_mapping@, @simple_lowercase_mapping@, @simple_titlecase_mapping@, @special_casing_start_index@, @special_casing_size@, @case_folding_start_index@, @case_folding_size@ },)~~~");
@@ -1131,9 +1131,9 @@ static constexpr Array<CasingTable, @size@> @name@ { {)~~~");
     };
 
     auto append_property_table = [&](auto collection_snake, auto const& unique_properties) -> ErrorOr<void> {
-        TRY(generator.set("name", TRY(String::formatted("{}_unique_properties", collection_snake))));
-        TRY(generator.set("outer_size", TRY(String::number(unique_properties.size()))));
-        TRY(generator.set("inner_size", TRY(String::number(unique_properties[0].size()))));
+        generator.set("name", TRY(String::formatted("{}_unique_properties", collection_snake)));
+        generator.set("outer_size", TRY(String::number(unique_properties.size())));
+        generator.set("inner_size", TRY(String::number(unique_properties[0].size())));
 
         generator.append(R"~~~(
 static constexpr Array<Array<bool, @inner_size@>, @outer_size@> @name@ { {)~~~");
@@ -1143,7 +1143,7 @@ static constexpr Array<Array<bool, @inner_size@>, @outer_size@> @name@ { {)~~~")
     { )~~~");
 
             for (auto value : property_set) {
-                TRY(generator.set("value", TRY(String::formatted("{}", value))));
+                generator.set("value", TRY(String::formatted("{}", value)));
                 generator.append("@value@, ");
             }
 
@@ -1159,8 +1159,8 @@ static constexpr Array<Array<bool, @inner_size@>, @outer_size@> @name@ { {)~~~")
 
     auto append_code_point_tables = [&](StringView collection_snake, auto const& tables, auto& append_unique_properties) -> ErrorOr<void> {
         auto append_stage = [&](auto const& stage, auto name, auto type) -> ErrorOr<void> {
-            TRY(generator.set("name", TRY(String::formatted("{}_{}", collection_snake, name))));
-            TRY(generator.set("size", TRY(String::number(stage.size()))));
+            generator.set("name", TRY(String::formatted("{}_{}", collection_snake, name)));
+            generator.set("size", TRY(String::number(stage.size())));
             generator.set("type", type);
 
             generator.append(R"~~~(
@@ -1174,7 +1174,7 @@ static constexpr Array<@type@, @size@> @name@ { {
                 if (values_in_current_row++ > 0)
                     generator.append(", ");
 
-                TRY(generator.set("value", TRY(String::number(value))));
+                generator.set("value", TRY(String::number(value)));
                 generator.append("@value@");
 
                 if (values_in_current_row == max_values_per_row) {
diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateAriaRoles.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateAriaRoles.cpp
index 3900333882..7d00e9c445 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateAriaRoles.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateAriaRoles.cpp
@@ -133,7 +133,7 @@ ErrorOr<void> generate_hash_table_member(SourceGenerator& generator, StringView
     member_generator.set("member_name"sv, member_name);
     member_generator.set("hash_table_name"sv, hash_table_name);
     member_generator.set("enum_class"sv, enum_class);
-    TRY(member_generator.set("hash_table_size"sv, TRY(String::number(values.size()))));
+    member_generator.set("hash_table_size"sv, TRY(String::number(values.size())));
 
     if (values.size() == 0) {
         member_generator.append(R"~~~(
diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSEasingFunctions.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSEasingFunctions.cpp
index 6f39c88c79..200c87ef62 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSEasingFunctions.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSEasingFunctions.cpp
@@ -58,7 +58,7 @@ namespace Web::CSS {
     TRY(generator.try_appendln("enum class EasingFunction {"));
     TRY(easing_data.try_for_each_member([&](auto& name, auto&) -> ErrorOr<void> {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
         TRY(member_generator.try_appendln("    @name:titlecase@,"));
         return {};
     }));
@@ -110,8 +110,8 @@ Optional<EasingFunction> easing_function_from_string(StringView name)
 )~~~"));
     TRY(easing_data.try_for_each_member([&](auto& name, auto&) -> ErrorOr<void> {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name", TRY(String::from_deprecated_string(name))));
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name", TRY(String::from_deprecated_string(name)));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
         TRY(member_generator.try_append(R"~~~(
     if (name.equals_ignoring_ascii_case("@name@"sv))
         return EasingFunction::@name:titlecase@;
@@ -130,8 +130,8 @@ StringView to_string(EasingFunction easing_function)
 )~~~"));
     TRY(easing_data.try_for_each_member([&](auto& name, auto&) -> ErrorOr<void> {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name", TRY(String::from_deprecated_string(name))));
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name", TRY(String::from_deprecated_string(name)));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
         TRY(member_generator.try_append(R"~~~(
     case EasingFunction::@name:titlecase@:
         return "@name@"sv;
@@ -154,7 +154,7 @@ EasingFunctionMetadata easing_function_metadata(EasingFunction easing_function)
         VERIFY(value.is_object());
 
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
         TRY(member_generator.try_append(R"~~~(
     case EasingFunction::@name:titlecase@:
         return EasingFunctionMetadata {
diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSEnums.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSEnums.cpp
index bd1e6cabf3..a43cfb4f61 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSEnums.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSEnums.cpp
@@ -59,19 +59,19 @@ enum class ValueID;
         auto& members = value.as_array();
 
         auto enum_generator = TRY(generator.fork());
-        TRY(enum_generator.set("name:titlecase", TRY(title_casify(name))));
-        TRY(enum_generator.set("name:snakecase", TRY(snake_casify(name))));
+        enum_generator.set("name:titlecase", TRY(title_casify(name)));
+        enum_generator.set("name:snakecase", TRY(snake_casify(name)));
 
         // Find the smallest possible type to use.
         auto member_max_value = members.size() - 1;
         if (NumericLimits<u8>::max() >= member_max_value) {
-            TRY(enum_generator.set("enum_type", "u8"_string));
+            enum_generator.set("enum_type", "u8"_string);
         } else if (NumericLimits<u16>::max() >= member_max_value) {
-            TRY(enum_generator.set("enum_type", "u16"_string));
+            enum_generator.set("enum_type", "u16"_string);
         } else if (NumericLimits<u32>::max() >= member_max_value) {
-            TRY(enum_generator.set("enum_type", "u32"_string));
+            enum_generator.set("enum_type", "u32"_string);
         } else {
-            TRY(enum_generator.set("enum_type", "u64"_string));
+            enum_generator.set("enum_type", "u64"_string);
         }
 
         TRY(enum_generator.try_appendln("enum class @name:titlecase@ : @enum_type@ {"));
@@ -82,7 +82,7 @@ enum class ValueID;
             if (member_name.contains('='))
                 continue;
             auto member_generator = TRY(enum_generator.fork());
-            TRY(member_generator.set("member:titlecase", TRY(title_casify(member_name))));
+            member_generator.set("member:titlecase", TRY(title_casify(member_name)));
             TRY(member_generator.try_appendln("    @member:titlecase@,"));
         }
 
@@ -117,8 +117,8 @@ namespace Web::CSS {
         auto& members = value.as_array();
 
         auto enum_generator = TRY(generator.fork());
-        TRY(enum_generator.set("name:titlecase", TRY(title_casify(name))));
-        TRY(enum_generator.set("name:snakecase", TRY(snake_casify(name))));
+        enum_generator.set("name:titlecase", TRY(title_casify(name)));
+        enum_generator.set("name:snakecase", TRY(snake_casify(name)));
 
         TRY(enum_generator.try_append(R"~~~(
 Optional<@name:titlecase@> value_id_to_@name:snakecase@(ValueID value_id)
@@ -130,11 +130,11 @@ Optional<@name:titlecase@> value_id_to_@name:snakecase@(ValueID value_id)
             auto member_name = member.to_deprecated_string();
             if (member_name.contains('=')) {
                 auto parts = member_name.split_view('=');
-                TRY(member_generator.set("valueid:titlecase", TRY(title_casify(parts[0]))));
-                TRY(member_generator.set("member:titlecase", TRY(title_casify(parts[1]))));
+                member_generator.set("valueid:titlecase", TRY(title_casify(parts[0])));
+                member_generator.set("member:titlecase", TRY(title_casify(parts[1])));
             } else {
-                TRY(member_generator.set("valueid:titlecase", TRY(title_casify(member_name))));
-                TRY(member_generator.set("member:titlecase", TRY(title_casify(member_name))));
+                member_generator.set("valueid:titlecase", TRY(title_casify(member_name)));
+                member_generator.set("member:titlecase", TRY(title_casify(member_name)));
             }
             TRY(member_generator.try_append(R"~~~(
     case ValueID::@valueid:titlecase@:
@@ -158,7 +158,7 @@ ValueID to_value_id(@name:titlecase@ @name:snakecase@_value)
             auto member_name = member.to_deprecated_string();
             if (member_name.contains('='))
                 continue;
-            TRY(member_generator.set("member:titlecase", TRY(title_casify(member_name))));
+            member_generator.set("member:titlecase", TRY(title_casify(member_name)));
 
             TRY(member_generator.try_append(R"~~~(
     case @name:titlecase@::@member:titlecase@:
@@ -182,8 +182,8 @@ StringView to_string(@name:titlecase@ value)
             auto member_name = member.to_deprecated_string();
             if (member_name.contains('='))
                 continue;
-            TRY(member_generator.set("member:css", TRY(String::from_deprecated_string(member_name))));
-            TRY(member_generator.set("member:titlecase", TRY(title_casify(member_name))));
+            member_generator.set("member:css", TRY(String::from_deprecated_string(member_name)));
+            member_generator.set("member:titlecase", TRY(title_casify(member_name)));
 
             TRY(member_generator.try_append(R"~~~(
     case @name:titlecase@::@member:titlecase@:
diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMathFunctions.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMathFunctions.cpp
index 08ba3f82f0..2551242774 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMathFunctions.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMathFunctions.cpp
@@ -55,7 +55,7 @@ enum class MathFunction {
 
     TRY(functions_data.try_for_each_member([&](auto& name, auto&) -> ErrorOr<void> {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
         TRY(member_generator.try_appendln("    @name:titlecase@,"sv));
         return {};
     }));
@@ -155,8 +155,8 @@ OwnPtr<CalculationNode> Parser::parse_math_function(PropertyID property_id, Func
         auto& parameters = function_data.get_array("parameters"sv).value();
 
         auto function_generator = TRY(generator.fork());
-        TRY(function_generator.set("name:lowercase", TRY(String::from_deprecated_string(name))));
-        TRY(function_generator.set("name:titlecase", TRY(title_casify(name))));
+        function_generator.set("name:lowercase", TRY(String::from_deprecated_string(name)));
+        function_generator.set("name:titlecase", TRY(title_casify(name)));
         TRY(function_generator.try_appendln("    if (function.name().equals_ignoring_ascii_case(\"@name:lowercase@\"sv)) {"));
         if (function_data.get_bool("is-variadic"sv).value_or(false)) {
             // Variadic function
@@ -184,7 +184,7 @@ OwnPtr<CalculationNode> Parser::parse_math_function(PropertyID property_id, Func
             VERIFY(parameters.size() == 1);
             auto& parameter_data = parameters[0].as_object();
             auto parameter_type_string = parameter_data.get_deprecated_string("type"sv).value();
-            TRY(function_generator.set("type_check", TRY(generate_calculation_type_check("argument_type"sv, parameter_type_string))));
+            function_generator.set("type_check", TRY(generate_calculation_type_check("argument_type"sv, parameter_type_string)));
             TRY(function_generator.try_append(R"~~~(
             if (!(@type_check@)) {
                 dbgln_if(CSS_PARSER_DEBUG, "@name:lowercase@() argument #{} type ({}) is not an accepted type", parsed_arguments.size(), MUST(argument_type.dump()));
@@ -216,8 +216,8 @@ OwnPtr<CalculationNode> Parser::parse_math_function(PropertyID property_id, Func
                 if (parameter.get_bool("required"sv) == true)
                     min_argument_count++;
             });
-            TRY(function_generator.set("min_argument_count", TRY(String::number(min_argument_count))));
-            TRY(function_generator.set("max_argument_count", TRY(String::number(max_argument_count))));
+            function_generator.set("min_argument_count", TRY(String::number(min_argument_count)));
+            function_generator.set("max_argument_count", TRY(String::number(max_argument_count)));
 
             TRY(function_generator.try_append(R"~~~(
         if (arguments.size() < @min_argument_count@ || arguments.size() > @max_argument_count@) {
@@ -236,35 +236,35 @@ OwnPtr<CalculationNode> Parser::parse_math_function(PropertyID property_id, Func
                 auto parameter_required = parameter.get_bool("required"sv).value();
 
                 auto parameter_generator = TRY(function_generator.fork());
-                TRY(parameter_generator.set("parameter_name", TRY(String::from_deprecated_string(parameter.get_deprecated_string("name"sv).value()))));
-                TRY(parameter_generator.set("parameter_index", TRY(String::number(parameter_index))));
+                parameter_generator.set("parameter_name", TRY(String::from_deprecated_string(parameter.get_deprecated_string("name"sv).value())));
+                parameter_generator.set("parameter_index", TRY(String::number(parameter_index)));
 
                 bool parameter_is_calculation;
                 if (parameter_type_string == "<rounding-strategy>") {
                     parameter_is_calculation = false;
-                    TRY(parameter_generator.set("parameter_type", "RoundingStrategy"_string));
-                    TRY(parameter_generator.set("parse_function", "parse_rounding_strategy(arguments[argument_index])"_string));
-                    TRY(parameter_generator.set("check_function", ".has_value()"_string));
-                    TRY(parameter_generator.set("release_function", ".release_value()"_string));
+                    parameter_generator.set("parameter_type", "RoundingStrategy"_string);
+                    parameter_generator.set("parse_function", "parse_rounding_strategy(arguments[argument_index])"_string);
+                    parameter_generator.set("check_function", ".has_value()"_string);
+                    parameter_generator.set("release_function", ".release_value()"_string);
                     if (auto default_value = parameter.get_deprecated_string("default"sv); default_value.has_value()) {
-                        TRY(parameter_generator.set("parameter_default", TRY(String::formatted(" = RoundingStrategy::{}", TRY(title_casify(default_value.value()))))));
+                        parameter_generator.set("parameter_default", TRY(String::formatted(" = RoundingStrategy::{}", TRY(title_casify(default_value.value())))));
                     } else {
-                        TRY(parameter_generator.set("parameter_default", ""_string));
+                        parameter_generator.set("parameter_default", ""_string);
                     }
                 } else {
                     // NOTE: This assumes everything not handled above is a calculation node of some kind.
                     parameter_is_calculation = true;
-                    TRY(parameter_generator.set("parameter_type", "OwnPtr<CalculationNode>"_string));
-                    TRY(parameter_generator.set("parse_function", "parse_a_calculation(arguments[argument_index])"_string));
-                    TRY(parameter_generator.set("check_function", " != nullptr"_string));
-                    TRY(parameter_generator.set("release_function", ".release_nonnull()"_string));
+                    parameter_generator.set("parameter_type", "OwnPtr<CalculationNode>"_string);
+                    parameter_generator.set("parse_function", "parse_a_calculation(arguments[argument_index])"_string);
+                    parameter_generator.set("check_function", " != nullptr"_string);
+                    parameter_generator.set("release_function", ".release_nonnull()"_string);
 
                     // NOTE: We have exactly one default value in the data right now, and it's a `<calc-constant>`,
                     //       so that's all we handle.
                     if (auto default_value = parameter.get_deprecated_string("default"sv); default_value.has_value()) {
-                        TRY(parameter_generator.set("parameter_default", TRY(String::formatted(" = ConstantCalculationNode::create(CalculationNode::constant_type_from_string(\"{}\"sv).value())", TRY(String::from_deprecated_string(default_value.value()))))));
+                        parameter_generator.set("parameter_default", TRY(String::formatted(" = ConstantCalculationNode::create(CalculationNode::constant_type_from_string(\"{}\"sv).value())", TRY(String::from_deprecated_string(default_value.value())))));
                     } else {
-                        TRY(parameter_generator.set("parameter_default", ""_string));
+                        parameter_generator.set("parameter_default", ""_string);
                     }
                 }
 
@@ -305,7 +305,7 @@ OwnPtr<CalculationNode> Parser::parse_math_function(PropertyID property_id, Func
 
                 if (parameter_is_calculation) {
                     auto parameter_type_variable = TRY(String::formatted("argument_type_{}", parameter_index));
-                    TRY(parameter_generator.set("type_check", TRY(generate_calculation_type_check(parameter_type_variable, parameter_type_string))));
+                    parameter_generator.set("type_check", TRY(generate_calculation_type_check(parameter_type_variable, parameter_type_string)));
                     TRY(parameter_generator.try_append(R"~~~(
         auto maybe_argument_type_@parameter_index@ = parameter_@parameter_index@->determine_type(property_id);
         if (!maybe_argument_type_@parameter_index@.has_value()) {
@@ -348,13 +348,13 @@ OwnPtr<CalculationNode> Parser::parse_math_function(PropertyID property_id, Func
                 auto parameter_type_string = parameter.get_deprecated_string("type"sv).value();
 
                 auto parameter_generator = TRY(function_generator.fork());
-                TRY(parameter_generator.set("parameter_index"sv, TRY(String::number(parameter_index))));
+                parameter_generator.set("parameter_index"sv, TRY(String::number(parameter_index)));
 
                 if (parameter_type_string == "<rounding-strategy>"sv) {
-                    TRY(parameter_generator.set("release_value"sv, ""_string));
+                    parameter_generator.set("release_value"sv, ""_string);
                 } else {
                     // NOTE: This assumes everything not handled above is a calculation node of some kind.
-                    TRY(parameter_generator.set("release_value"sv, ".release_nonnull()"_string));
+                    parameter_generator.set("release_value"sv, ".release_nonnull()"_string);
                 }
 
                 if (parameter_index == 0) {
diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMediaFeatureID.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMediaFeatureID.cpp
index 97a86b2944..e938c2b464 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMediaFeatureID.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMediaFeatureID.cpp
@@ -62,7 +62,7 @@ enum class MediaFeatureID {)~~~"));
 
     TRY(media_feature_data.try_for_each_member([&](auto& name, auto&) -> ErrorOr<void> {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
         TRY(member_generator.try_append(R"~~~(
     @name:titlecase@,)~~~"));
         return {};
@@ -100,8 +100,8 @@ Optional<MediaFeatureID> media_feature_id_from_string(StringView string)
 
     TRY(media_feature_data.try_for_each_member([&](auto& name, auto&) -> ErrorOr<void> {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name", TRY(String::from_deprecated_string(name))));
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name", TRY(String::from_deprecated_string(name)));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
         TRY(member_generator.try_append(R"~~~(
     if (Infra::is_ascii_case_insensitive_match(string, "@name@"sv))
         return MediaFeatureID::@name:titlecase@;
@@ -119,8 +119,8 @@ StringView string_from_media_feature_id(MediaFeatureID media_feature_id)
 
     TRY(media_feature_data.try_for_each_member([&](auto& name, auto&) -> ErrorOr<void> {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name", TRY(String::from_deprecated_string(name))));
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name", TRY(String::from_deprecated_string(name)));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
         TRY(member_generator.try_append(R"~~~(
     case MediaFeatureID::@name:titlecase@:
         return "@name@"sv;)~~~"));
@@ -141,11 +141,11 @@ bool media_feature_type_is_range(MediaFeatureID media_feature_id)
         auto& feature = value.as_object();
 
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
         VERIFY(feature.has("type"sv));
         auto feature_type = feature.get_deprecated_string("type"sv);
         VERIFY(feature_type.has_value());
-        TRY(member_generator.set("is_range", feature_type.value() == "range" ? "true"_string : "false"_string));
+        member_generator.set("is_range", feature_type.value() == "range" ? "true"_string : "false"_string);
         TRY(member_generator.try_append(R"~~~(
     case MediaFeatureID::@name:titlecase@:
         return @is_range@;)~~~"));
@@ -166,7 +166,7 @@ bool media_feature_accepts_type(MediaFeatureID media_feature_id, MediaFeatureVal
         auto& feature = member.as_object();
 
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
         TRY(member_generator.try_append(R"~~~(
     case MediaFeatureID::@name:titlecase@:)~~~"));
 
@@ -246,7 +246,7 @@ bool media_feature_accepts_identifier(MediaFeatureID media_feature_id, ValueID i
         auto& feature = member.as_object();
 
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
         TRY(member_generator.try_append(R"~~~(
     case MediaFeatureID::@name:titlecase@:)~~~"));
 
@@ -272,7 +272,7 @@ bool media_feature_accepts_identifier(MediaFeatureID media_feature_id, ValueID i
                 TRY(append_identifier_switch_if_needed());
 
                 auto ident_generator = TRY(member_generator.fork());
-                TRY(ident_generator.set("identifier:titlecase", TRY(title_casify(identifier_name))));
+                ident_generator.set("identifier:titlecase", TRY(title_casify(identifier_name)));
                 TRY(ident_generator.try_append(R"~~~(
         case ValueID::@identifier:titlecase@:
             return true;)~~~"));
diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPropertyID.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPropertyID.cpp
index 29d778b8a5..f6b4b1b1b6 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPropertyID.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPropertyID.cpp
@@ -124,7 +124,7 @@ enum class PropertyID {
 
     for (auto& name : shorthand_property_ids) {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
 
         TRY(member_generator.try_append(R"~~~(
     @name:titlecase@,
@@ -133,21 +133,21 @@ enum class PropertyID {
 
     for (auto& name : longhand_property_ids) {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
 
         TRY(member_generator.try_append(R"~~~(
     @name:titlecase@,
 )~~~"));
     }
 
-    TRY(generator.set("first_property_id", TRY(title_casify(first_property_id))));
-    TRY(generator.set("last_property_id", TRY(title_casify(last_property_id))));
+    generator.set("first_property_id", TRY(title_casify(first_property_id)));
+    generator.set("last_property_id", TRY(title_casify(last_property_id)));
 
-    TRY(generator.set("first_shorthand_property_id", TRY(title_casify(shorthand_property_ids.first()))));
-    TRY(generator.set("last_shorthand_property_id", TRY(title_casify(shorthand_property_ids.last()))));
+    generator.set("first_shorthand_property_id", TRY(title_casify(shorthand_property_ids.first())));
+    generator.set("last_shorthand_property_id", TRY(title_casify(shorthand_property_ids.last())));
 
-    TRY(generator.set("first_longhand_property_id", TRY(title_casify(longhand_property_ids.first()))));
-    TRY(generator.set("last_longhand_property_id", TRY(title_casify(longhand_property_ids.last()))));
+    generator.set("first_longhand_property_id", TRY(title_casify(longhand_property_ids.first())));
+    generator.set("last_longhand_property_id", TRY(title_casify(longhand_property_ids.last())));
 
     TRY(generator.try_append(R"~~~(
 };
@@ -232,8 +232,8 @@ struct Traits<Web::CSS::PropertyID> : public GenericTraits<Web::CSS::PropertyID>
 ErrorOr<void> generate_bounds_checking_function(JsonObject& properties, SourceGenerator& parent_generator, StringView css_type_name, StringView type_name, Optional<StringView> default_unit_name, Optional<StringView> value_getter)
 {
     auto generator = TRY(parent_generator.fork());
-    TRY(generator.set("css_type_name", TRY(String::from_utf8(css_type_name))));
-    TRY(generator.set("type_name", TRY(String::from_utf8(type_name))));
+    generator.set("css_type_name", TRY(String::from_utf8(css_type_name)));
+    generator.set("type_name", TRY(String::from_utf8(type_name)));
 
     TRY(generator.try_append(R"~~~(
 bool property_accepts_@css_type_name@(PropertyID property_id, [[maybe_unused]] @type_name@ const& value)
@@ -250,7 +250,7 @@ bool property_accepts_@css_type_name@(PropertyID property_id, [[maybe_unused]] @
                     continue;
 
                 auto property_generator = TRY(generator.fork());
-                TRY(property_generator.set("property_name:titlecase", TRY(title_casify(name))));
+                property_generator.set("property_name:titlecase", TRY(title_casify(name)));
 
                 TRY(property_generator.try_append(R"~~~(
     case PropertyID::@property_name:titlecase@:
@@ -276,9 +276,9 @@ bool property_accepts_@css_type_name@(PropertyID property_id, [[maybe_unused]] @
 
                     auto output_check = [&](auto& value_string, StringView comparator) -> ErrorOr<void> {
                         if (value_getter.has_value()) {
-                            TRY(property_generator.set("value_number", TRY(String::from_utf8(value_string))));
-                            TRY(property_generator.set("value_getter", TRY(String::from_utf8(value_getter.value()))));
-                            TRY(property_generator.set("comparator", TRY(String::from_utf8(comparator))));
+                            property_generator.set("value_number", TRY(String::from_utf8(value_string)));
+                            property_generator.set("value_getter", TRY(String::from_utf8(value_getter.value())));
+                            property_generator.set("comparator", TRY(String::from_utf8(comparator)));
                             TRY(property_generator.try_append("@value_getter@ @comparator@ @value_number@"));
                             return {};
                         }
@@ -289,9 +289,9 @@ bool property_accepts_@css_type_name@(PropertyID property_id, [[maybe_unused]] @
                         if (value_unit.is_empty())
                             value_unit = default_unit_name.value();
                         VERIFY(lexer.is_eof());
-                        TRY(property_generator.set("value_number", TRY(String::from_utf8(value_number))));
-                        TRY(property_generator.set("value_unit", TRY(title_casify(value_unit))));
-                        TRY(property_generator.set("comparator", TRY(String::from_utf8(comparator))));
+                        property_generator.set("value_number", TRY(String::from_utf8(value_number)));
+                        property_generator.set("value_unit", TRY(title_casify(value_unit)));
+                        property_generator.set("comparator", TRY(String::from_utf8(comparator)));
                         TRY(property_generator.try_append("value @comparator@ @type_name@(@value_number@, @type_name@::Type::@value_unit@)"));
                         return {};
                     };
@@ -346,9 +346,9 @@ Optional<PropertyID> property_id_from_camel_case_string(StringView string)
         VERIFY(value.is_object());
 
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name", TRY(String::from_deprecated_string(name))));
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
-        TRY(member_generator.set("name:camelcase", TRY(camel_casify(name))));
+        member_generator.set("name", TRY(String::from_deprecated_string(name)));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
+        member_generator.set("name:camelcase", TRY(camel_casify(name)));
         TRY(member_generator.try_append(R"~~~(
     if (string.equals_ignoring_ascii_case("@name:camelcase@"sv))
         return PropertyID::@name:titlecase@;
@@ -370,8 +370,8 @@ Optional<PropertyID> property_id_from_string(StringView string)
         VERIFY(value.is_object());
 
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name", TRY(String::from_deprecated_string(name))));
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name", TRY(String::from_deprecated_string(name)));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
         TRY(member_generator.try_append(R"~~~(
     if (Infra::is_ascii_case_insensitive_match(string, "@name@"sv))
         return PropertyID::@name:titlecase@;
@@ -391,8 +391,8 @@ StringView string_from_property_id(PropertyID property_id) {
         VERIFY(value.is_object());
 
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name", TRY(String::from_deprecated_string(name))));
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name", TRY(String::from_deprecated_string(name)));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
         TRY(member_generator.try_append(R"~~~(
     case PropertyID::@name:titlecase@:
         return "@name@"sv;
@@ -423,7 +423,7 @@ bool is_inherited_property(PropertyID property_id)
 
         if (inherited) {
             auto member_generator = TRY(generator.fork());
-            TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+            member_generator.set("name:titlecase", TRY(title_casify(name)));
             TRY(member_generator.try_append(R"~~~(
     case PropertyID::@name:titlecase@:
         return true;
@@ -452,7 +452,7 @@ bool property_affects_layout(PropertyID property_id)
 
         if (affects_layout) {
             auto member_generator = TRY(generator.fork());
-            TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+            member_generator.set("name:titlecase", TRY(title_casify(name)));
             TRY(member_generator.try_append(R"~~~(
     case PropertyID::@name:titlecase@:
 )~~~"));
@@ -481,7 +481,7 @@ bool property_affects_stacking_context(PropertyID property_id)
 
         if (affects_stacking_context) {
             auto member_generator = TRY(generator.fork());
-            TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+            member_generator.set("name:titlecase", TRY(title_casify(name)));
             TRY(member_generator.try_append(R"~~~(
     case PropertyID::@name:titlecase@:
 )~~~"));
@@ -520,8 +520,8 @@ NonnullRefPtr<StyleValue> property_initial_value(JS::Realm& context_realm, Prope
         auto& initial_value_string = initial_value.value();
 
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
-        TRY(member_generator.set("initial_value_string", TRY(String::from_deprecated_string(initial_value_string))));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
+        member_generator.set("initial_value_string", TRY(String::from_deprecated_string(initial_value_string)));
         TRY(member_generator.try_append(
             R"~~~(        case PropertyID::@name:titlecase@:
         {
@@ -561,7 +561,7 @@ bool property_has_quirk(PropertyID property_id, Quirk quirk)
 
             if (!quirks.is_empty()) {
                 auto property_generator = TRY(generator.fork());
-                TRY(property_generator.set("name:titlecase", TRY(title_casify(name))));
+                property_generator.set("name:titlecase", TRY(title_casify(name)));
                 TRY(property_generator.try_append(R"~~~(
     case PropertyID::@name:titlecase@: {
         switch (quirk) {
@@ -569,7 +569,7 @@ bool property_has_quirk(PropertyID property_id, Quirk quirk)
                 for (auto& quirk : quirks.values()) {
                     VERIFY(quirk.is_string());
                     auto quirk_generator = TRY(property_generator.fork());
-                    TRY(quirk_generator.set("quirk:titlecase", TRY(title_casify(quirk.as_string()))));
+                    quirk_generator.set("quirk:titlecase", TRY(title_casify(quirk.as_string())));
                     TRY(quirk_generator.try_append(R"~~~(
         case Quirk::@quirk:titlecase@:
             return true;
@@ -602,7 +602,7 @@ bool property_accepts_type(PropertyID property_id, ValueType value_type)
         if (auto maybe_valid_types = object.get_array("valid-types"sv); maybe_valid_types.has_value() && !maybe_valid_types->is_empty()) {
             auto& valid_types = maybe_valid_types.value();
             auto property_generator = TRY(generator.fork());
-            TRY(property_generator.set("name:titlecase", TRY(title_casify(name))));
+            property_generator.set("name:titlecase", TRY(title_casify(name)));
             TRY(property_generator.try_append(R"~~~(
     case PropertyID::@name:titlecase@: {
         switch (value_type) {
@@ -682,7 +682,7 @@ bool property_accepts_identifier(PropertyID property_id, ValueID identifier)
         auto& object = value.as_object();
 
         auto property_generator = TRY(generator.fork());
-        TRY(property_generator.set("name:titlecase", TRY(title_casify(name))));
+        property_generator.set("name:titlecase", TRY(title_casify(name)));
         TRY(property_generator.try_appendln("    case PropertyID::@name:titlecase@: {"));
 
         if (auto maybe_valid_identifiers = object.get_array("valid-identifiers"sv); maybe_valid_identifiers.has_value() && !maybe_valid_identifiers->is_empty()) {
@@ -690,7 +690,7 @@ bool property_accepts_identifier(PropertyID property_id, ValueID identifier)
             auto& valid_identifiers = maybe_valid_identifiers.value();
             for (auto& identifier : valid_identifiers.values()) {
                 auto identifier_generator = TRY(generator.fork());
-                TRY(identifier_generator.set("identifier:titlecase", TRY(title_casify(identifier.as_string()))));
+                identifier_generator.set("identifier:titlecase", TRY(title_casify(identifier.as_string())));
                 TRY(identifier_generator.try_appendln("        case ValueID::@identifier:titlecase@:"));
             }
             TRY(property_generator.try_append(R"~~~(
@@ -709,7 +709,7 @@ bool property_accepts_identifier(PropertyID property_id, ValueID identifier)
                     continue;
 
                 auto type_generator = TRY(generator.fork());
-                TRY(type_generator.set("type_name:snakecase", TRY(snake_casify(type_name))));
+                type_generator.set("type_name:snakecase", TRY(snake_casify(type_name)));
                 TRY(type_generator.try_append(R"~~~(
         if (value_id_to_@type_name:snakecase@(identifier).has_value())
             return true;
@@ -737,8 +737,8 @@ Optional<ValueType> property_resolves_percentages_relative_to(PropertyID propert
         VERIFY(value.is_object());
         if (auto resolved_type = value.as_object().get_deprecated_string("percentages-resolve-to"sv); resolved_type.has_value()) {
             auto property_generator = TRY(generator.fork());
-            TRY(property_generator.set("name:titlecase", TRY(title_casify(name))));
-            TRY(property_generator.set("resolved_type:titlecase", TRY(title_casify(resolved_type.value()))));
+            property_generator.set("name:titlecase", TRY(title_casify(name)));
+            property_generator.set("resolved_type:titlecase", TRY(title_casify(resolved_type.value())));
             TRY(property_generator.try_append(R"~~~(
     case PropertyID::@name:titlecase@:
         return ValueType::@resolved_type:titlecase@;
@@ -764,8 +764,8 @@ size_t property_maximum_value_count(PropertyID property_id)
             auto max_values = value.as_object().get("max-values"sv);
             VERIFY(max_values.has_value() && max_values->is_number() && !max_values->is_double());
             auto property_generator = TRY(generator.fork());
-            TRY(property_generator.set("name:titlecase", TRY(title_casify(name))));
-            TRY(property_generator.set("max_values", TRY(String::from_deprecated_string(max_values->to_deprecated_string()))));
+            property_generator.set("name:titlecase", TRY(title_casify(name)));
+            property_generator.set("max_values", TRY(String::from_deprecated_string(max_values->to_deprecated_string())));
             TRY(property_generator.try_append(R"~~~(
     case PropertyID::@name:titlecase@:
         return @max_values@;
@@ -800,7 +800,7 @@ Vector<PropertyID> longhands_for_shorthand(PropertyID property_id)
             VERIFY(longhands.has_value() && longhands->is_array());
             auto longhand_values = longhands->as_array();
             auto property_generator = TRY(generator.fork());
-            TRY(property_generator.set("name:titlecase", TRY(title_casify(name))));
+            property_generator.set("name:titlecase", TRY(title_casify(name)));
             StringBuilder builder;
             bool first = true;
             TRY(longhand_values.try_for_each([&](auto& longhand) -> ErrorOr<IterationDecision> {
diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPseudoClass.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPseudoClass.cpp
index 910aca738e..ca9aec0b4f 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPseudoClass.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPseudoClass.cpp
@@ -55,7 +55,7 @@ enum class PseudoClass {
 
     TRY(pseudo_classes_data.try_for_each_member([&](auto& name, auto&) -> ErrorOr<void> {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
 
         TRY(member_generator.try_appendln("    @name:titlecase@,"));
         return {};
@@ -105,8 +105,8 @@ Optional<PseudoClass> pseudo_class_from_string(StringView string)
 
     TRY(pseudo_classes_data.try_for_each_member([&](auto& name, auto&) -> ErrorOr<void> {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name", TRY(String::from_deprecated_string(name))));
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name", TRY(String::from_deprecated_string(name)));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
 
         TRY(member_generator.try_append(R"~~~(
     if (string.equals_ignoring_ascii_case("@name@"sv))
@@ -127,8 +127,8 @@ StringView pseudo_class_name(PseudoClass pseudo_class)
 
     TRY(pseudo_classes_data.try_for_each_member([&](auto& name, auto&) -> ErrorOr<void> {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name", TRY(String::from_deprecated_string(name))));
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
+        member_generator.set("name", TRY(String::from_deprecated_string(name)));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
 
         TRY(member_generator.try_append(R"~~~(
     case PseudoClass::@name:titlecase@:
@@ -182,10 +182,10 @@ PseudoClassMetadata pseudo_class_metadata(PseudoClass pseudo_class)
             }
         }
 
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name))));
-        TRY(member_generator.set("parameter_type", parameter_type));
-        TRY(member_generator.set("is_valid_as_function", is_valid_as_function ? "true"_string : "false"_string));
-        TRY(member_generator.set("is_valid_as_identifier", is_valid_as_identifier ? "true"_string : "false"_string));
+        member_generator.set("name:titlecase", TRY(title_casify(name)));
+        member_generator.set("parameter_type", parameter_type);
+        member_generator.set("is_valid_as_function", is_valid_as_function ? "true"_string : "false"_string);
+        member_generator.set("is_valid_as_identifier", is_valid_as_identifier ? "true"_string : "false"_string);
 
         TRY(member_generator.try_append(R"~~~(
     case PseudoClass::@name:titlecase@:
diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSTransformFunctions.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSTransformFunctions.cpp
index c50782f57e..b473aa82cb 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSTransformFunctions.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSTransformFunctions.cpp
@@ -67,7 +67,7 @@ namespace Web::CSS {
     TRY(generator.try_appendln("enum class TransformFunction {"));
     TRY(transforms_data.try_for_each_member([&](auto& name, auto&) -> ErrorOr<void> {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name:titlecase", TRY(title_casify_transform_function(name))));
+        member_generator.set("name:titlecase", TRY(title_casify_transform_function(name)));
         TRY(member_generator.try_appendln("    @name:titlecase@,"));
         return {};
     }));
@@ -119,8 +119,8 @@ Optional<TransformFunction> transform_function_from_string(StringView name)
 )~~~"));
     TRY(transforms_data.try_for_each_member([&](auto& name, auto&) -> ErrorOr<void> {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name", TRY(String::from_deprecated_string(name))));
-        TRY(member_generator.set("name:titlecase", TRY(title_casify_transform_function(name))));
+        member_generator.set("name", TRY(String::from_deprecated_string(name)));
+        member_generator.set("name:titlecase", TRY(title_casify_transform_function(name)));
         TRY(member_generator.try_append(R"~~~(
     if (name.equals_ignoring_ascii_case("@name@"sv))
         return TransformFunction::@name:titlecase@;
@@ -139,8 +139,8 @@ StringView to_string(TransformFunction transform_function)
 )~~~"));
     TRY(transforms_data.try_for_each_member([&](auto& name, auto&) -> ErrorOr<void> {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name", TRY(String::from_deprecated_string(name))));
-        TRY(member_generator.set("name:titlecase", TRY(title_casify_transform_function(name))));
+        member_generator.set("name", TRY(String::from_deprecated_string(name)));
+        member_generator.set("name:titlecase", TRY(title_casify_transform_function(name)));
         TRY(member_generator.try_append(R"~~~(
     case TransformFunction::@name:titlecase@:
         return "@name@"sv;
@@ -163,7 +163,7 @@ TransformFunctionMetadata transform_function_metadata(TransformFunction transfor
         VERIFY(value.is_object());
 
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name:titlecase", TRY(title_casify_transform_function(name))));
+        member_generator.set("name:titlecase", TRY(title_casify_transform_function(name)));
         TRY(member_generator.try_append(R"~~~(
     case TransformFunction::@name:titlecase@:
         return TransformFunctionMetadata {
diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSValueID.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSValueID.cpp
index d898079e43..05f3d1ade2 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSValueID.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSValueID.cpp
@@ -57,7 +57,7 @@ enum class ValueID {
 
     TRY(identifier_data.try_for_each([&](auto& name) -> ErrorOr<void> {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name.to_deprecated_string()))));
+        member_generator.set("name:titlecase", TRY(title_casify(name.to_deprecated_string())));
 
         TRY(member_generator.try_append(R"~~~(
     @name:titlecase@,
@@ -96,8 +96,8 @@ HashMap<StringView, ValueID, AK::CaseInsensitiveASCIIStringViewTraits> g_stringv
 
     TRY(identifier_data.try_for_each([&](auto& name) -> ErrorOr<void> {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name", TRY(String::from_deprecated_string(name.to_deprecated_string()))));
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name.to_deprecated_string()))));
+        member_generator.set("name", TRY(String::from_deprecated_string(name.to_deprecated_string())));
+        member_generator.set("name:titlecase", TRY(title_casify(name.to_deprecated_string())));
         TRY(member_generator.try_append(R"~~~(
     {"@name@"sv, ValueID::@name:titlecase@},
 )~~~"));
@@ -118,8 +118,8 @@ StringView string_from_value_id(ValueID value_id) {
 
     TRY(identifier_data.try_for_each([&](auto& name) -> ErrorOr<void> {
         auto member_generator = TRY(generator.fork());
-        TRY(member_generator.set("name", TRY(String::from_deprecated_string(name.to_deprecated_string()))));
-        TRY(member_generator.set("name:titlecase", TRY(title_casify(name.to_deprecated_string()))));
+        member_generator.set("name", TRY(String::from_deprecated_string(name.to_deprecated_string())));
+        member_generator.set("name:titlecase", TRY(title_casify(name.to_deprecated_string())));
         TRY(member_generator.try_append(R"~~~(
     case ValueID::@name:titlecase@:
         return "@name@"sv;