diff --git a/Libraries/LibWeb/CSS/CSSNumericType.cpp b/Libraries/LibWeb/CSS/CSSNumericType.cpp
index b568e5192cd..883b2ccd8f7 100644
--- a/Libraries/LibWeb/CSS/CSSNumericType.cpp
+++ b/Libraries/LibWeb/CSS/CSSNumericType.cpp
@@ -479,21 +479,21 @@ bool CSSNumericType::matches_dimension() const
     return number_of_one_exponents == 0 || number_of_one_exponents == 1;
 }
 
-ErrorOr<String> CSSNumericType::dump() const
+String CSSNumericType::dump() const
 {
     StringBuilder builder;
-    TRY(builder.try_appendff("{{ hint: {}", m_percent_hint.map([](auto base_type) { return base_type_name(base_type); })));
+    builder.appendff("{{ hint: {}", m_percent_hint.map([](auto base_type) { return base_type_name(base_type); }));
 
     for (auto i = 0; i < to_underlying(BaseType::__Count); ++i) {
         auto base_type = static_cast<BaseType>(i);
         auto type_exponent = exponent(base_type);
 
         if (type_exponent.has_value())
-            TRY(builder.try_appendff(", \"{}\" → {}", base_type_name(base_type), type_exponent.value()));
+            builder.appendff(", \"{}\" → {}", base_type_name(base_type), type_exponent.value());
     }
 
-    TRY(builder.try_append(" }"sv));
-    return builder.to_string();
+    builder.append(" }"sv);
+    return builder.to_string_without_validation();
 }
 
 }
diff --git a/Libraries/LibWeb/CSS/CSSNumericType.h b/Libraries/LibWeb/CSS/CSSNumericType.h
index b00a0de9c8a..680fb00dfb8 100644
--- a/Libraries/LibWeb/CSS/CSSNumericType.h
+++ b/Libraries/LibWeb/CSS/CSSNumericType.h
@@ -8,6 +8,7 @@
 
 #include <AK/Array.h>
 #include <AK/Optional.h>
+#include <AK/String.h>
 #include <LibWeb/CSS/PropertyID.h>
 
 namespace Web::CSS {
@@ -93,7 +94,7 @@ public:
 
     bool operator==(CSSNumericType const& other) const = default;
 
-    ErrorOr<String> dump() const;
+    String dump() const;
 
 private:
     bool contains_all_the_non_zero_entries_of_other_with_the_same_value(CSSNumericType const& other) const;
@@ -112,3 +113,11 @@ private:
 };
 
 }
+
+template<>
+struct AK::Formatter<Web::CSS::CSSNumericType> : Formatter<StringView> {
+    ErrorOr<void> format(FormatBuilder& builder, Web::CSS::CSSNumericType const& value)
+    {
+        return Formatter<StringView>::format(builder, value.dump());
+    }
+};
diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMathFunctions.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMathFunctions.cpp
index 40b8bbf4300..4f240b69de7 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMathFunctions.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMathFunctions.cpp
@@ -159,7 +159,7 @@ OwnPtr<CalculationNode> Parser::parse_math_function(PropertyID property_id, Func
             function_generator.set("type_check", generate_calculation_type_check("argument_type"sv, parameter_type_string));
             function_generator.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()));
+                dbgln_if(CSS_PARSER_DEBUG, "@name:lowercase@() argument #{} type ({}) is not an accepted type", parsed_arguments.size(), argument_type.dump());
                 return nullptr;
             }
 
@@ -167,7 +167,7 @@ OwnPtr<CalculationNode> Parser::parse_math_function(PropertyID property_id, Func
                 determined_argument_type = move(argument_type);
             } else {
                 if (determined_argument_type != argument_type) {
-                    dbgln_if(CSS_PARSER_DEBUG, "@name:lowercase@() argument #{} type ({}) doesn't match type of previous arguments ({})", parsed_arguments.size(), MUST(argument_type.dump()), MUST(determined_argument_type.dump()));
+                    dbgln_if(CSS_PARSER_DEBUG, "@name:lowercase@() argument #{} type ({}) doesn't match type of previous arguments ({})", parsed_arguments.size(), argument_type.dump(), determined_argument_type.dump());
                     return nullptr;
                 }
             }
@@ -287,7 +287,7 @@ OwnPtr<CalculationNode> Parser::parse_math_function(PropertyID property_id, Func
         auto argument_type_@parameter_index@ = maybe_argument_type_@parameter_index@.release_value();
 
         if (!(@type_check@)) {
-            dbgln_if(CSS_PARSER_DEBUG, "@name:lowercase@() argument '@parameter_name@' type ({}) is not an accepted type", MUST(argument_type_@parameter_index@.dump()));
+            dbgln_if(CSS_PARSER_DEBUG, "@name:lowercase@() argument '@parameter_name@' type ({}) is not an accepted type", argument_type_@parameter_index@.dump());
             return nullptr;
         }
 )~~~");
@@ -297,7 +297,7 @@ OwnPtr<CalculationNode> Parser::parse_math_function(PropertyID property_id, Func
                     if (previous_parameter_type_string == parameter_type_string) {
                         parameter_generator.append(R"~~~(
         if (argument_type_@parameter_index@ != previous_argument_type) {
-            dbgln_if(CSS_PARSER_DEBUG, "@name:lowercase@() argument '@parameter_name@' type ({}) doesn't match type of previous arguments ({})", MUST(argument_type_@parameter_index@.dump()), MUST(previous_argument_type.dump()));
+            dbgln_if(CSS_PARSER_DEBUG, "@name:lowercase@() argument '@parameter_name@' type ({}) doesn't match type of previous arguments ({})", argument_type_@parameter_index@.dump(), previous_argument_type.dump());
             return nullptr;
         }
 )~~~");