diff --git a/Libraries/LibWeb/CSS/Parser/ValueParsing.cpp b/Libraries/LibWeb/CSS/Parser/ValueParsing.cpp
index 70b34cddac5..7329804a605 100644
--- a/Libraries/LibWeb/CSS/Parser/ValueParsing.cpp
+++ b/Libraries/LibWeb/CSS/Parser/ValueParsing.cpp
@@ -4847,6 +4847,8 @@ RefPtr<StyleValue const> Parser::parse_value(ValueType value_type, TokenStream<C
         return parse_anchor_size(tokens);
     case ValueType::Angle:
         return parse_angle_value(tokens);
+    case ValueType::AnglePercentage:
+        return parse_angle_percentage_value(tokens);
     case ValueType::BackgroundPosition:
         return parse_position_value(tokens, PositionParsingMode::BackgroundPosition);
     case ValueType::BasicShape:
@@ -4870,12 +4872,16 @@ RefPtr<StyleValue const> Parser::parse_value(ValueType value_type, TokenStream<C
         return parse_flex_value(tokens);
     case ValueType::Frequency:
         return parse_frequency_value(tokens);
+    case ValueType::FrequencyPercentage:
+        return parse_frequency_percentage_value(tokens);
     case ValueType::Image:
         return parse_image_value(tokens);
     case ValueType::Integer:
         return parse_integer_value(tokens);
     case ValueType::Length:
         return parse_length_value(tokens);
+    case ValueType::LengthPercentage:
+        return parse_length_percentage_value(tokens);
     case ValueType::Number:
         return parse_number_value(tokens);
     case ValueType::Opacity:
@@ -4898,6 +4904,8 @@ RefPtr<StyleValue const> Parser::parse_value(ValueType value_type, TokenStream<C
         return parse_string_value(tokens);
     case ValueType::Time:
         return parse_time_value(tokens);
+    case ValueType::TimePercentage:
+        return parse_time_percentage_value(tokens);
     case ValueType::TransformFunction:
         return parse_transform_function_value(tokens);
     case ValueType::TransformList:
diff --git a/Libraries/LibWeb/CSS/ValueType.cpp b/Libraries/LibWeb/CSS/ValueType.cpp
index 598a8d2fd3d..feddc6fc250 100644
--- a/Libraries/LibWeb/CSS/ValueType.cpp
+++ b/Libraries/LibWeb/CSS/ValueType.cpp
@@ -15,6 +15,8 @@ Optional<ValueType> value_type_from_string(StringView string)
         return ValueType::AnchorSize;
     if (string.equals_ignoring_ascii_case("angle"sv))
         return ValueType::Angle;
+    if (string.equals_ignoring_ascii_case("angle-percentage"sv))
+        return ValueType::AnglePercentage;
     if (string.equals_ignoring_ascii_case("background-position"sv))
         return ValueType::BackgroundPosition;
     if (string.equals_ignoring_ascii_case("basic-shape"sv))
@@ -35,12 +37,16 @@ Optional<ValueType> value_type_from_string(StringView string)
         return ValueType::Flex;
     if (string.equals_ignoring_ascii_case("frequency"sv))
         return ValueType::Frequency;
+    if (string.equals_ignoring_ascii_case("frequency-percentage"sv))
+        return ValueType::FrequencyPercentage;
     if (string.equals_ignoring_ascii_case("image"sv))
         return ValueType::Image;
     if (string.equals_ignoring_ascii_case("integer"sv))
         return ValueType::Integer;
     if (string.equals_ignoring_ascii_case("length"sv))
         return ValueType::Length;
+    if (string.equals_ignoring_ascii_case("length-percentage"sv))
+        return ValueType::LengthPercentage;
     if (string.equals_ignoring_ascii_case("number"sv))
         return ValueType::Number;
     if (string.equals_ignoring_ascii_case("opacity"sv))
@@ -63,6 +69,8 @@ Optional<ValueType> value_type_from_string(StringView string)
         return ValueType::String;
     if (string.equals_ignoring_ascii_case("time"sv))
         return ValueType::Time;
+    if (string.equals_ignoring_ascii_case("time-percentage"sv))
+        return ValueType::TimePercentage;
     if (string.equals_ignoring_ascii_case("transform-function"sv))
         return ValueType::TransformFunction;
     if (string.equals_ignoring_ascii_case("transform-list"sv))
@@ -81,6 +89,8 @@ StringView value_type_to_string(ValueType value_type)
         return "AnchorSize"sv;
     case Web::CSS::ValueType::Angle:
         return "Angle"sv;
+    case Web::CSS::ValueType::AnglePercentage:
+        return "AnglePercentage"sv;
     case Web::CSS::ValueType::BackgroundPosition:
         return "BackgroundPosition"sv;
     case Web::CSS::ValueType::BasicShape:
@@ -103,12 +113,16 @@ StringView value_type_to_string(ValueType value_type)
         return "Flex"sv;
     case Web::CSS::ValueType::Frequency:
         return "Frequency"sv;
+    case Web::CSS::ValueType::FrequencyPercentage:
+        return "FrequencyPercentage"sv;
     case Web::CSS::ValueType::Image:
         return "Image"sv;
     case Web::CSS::ValueType::Integer:
         return "Integer"sv;
     case Web::CSS::ValueType::Length:
         return "Length"sv;
+    case Web::CSS::ValueType::LengthPercentage:
+        return "LengthPercentage"sv;
     case Web::CSS::ValueType::Number:
         return "Number"sv;
     case Web::CSS::ValueType::Opacity:
@@ -131,6 +145,8 @@ StringView value_type_to_string(ValueType value_type)
         return "String"sv;
     case Web::CSS::ValueType::Time:
         return "Time"sv;
+    case Web::CSS::ValueType::TimePercentage:
+        return "TimePercentage"sv;
     case Web::CSS::ValueType::TransformFunction:
         return "TransformFunction"sv;
     case Web::CSS::ValueType::TransformList:
diff --git a/Libraries/LibWeb/CSS/ValueType.h b/Libraries/LibWeb/CSS/ValueType.h
index 44f86b43af5..1487531e8d6 100644
--- a/Libraries/LibWeb/CSS/ValueType.h
+++ b/Libraries/LibWeb/CSS/ValueType.h
@@ -16,6 +16,7 @@ enum class ValueType : u8 {
     Anchor,
     AnchorSize,
     Angle,
+    AnglePercentage,
     BackgroundPosition,
     BasicShape,
     Color,
@@ -27,9 +28,11 @@ enum class ValueType : u8 {
     FitContent,
     Flex,
     Frequency,
+    FrequencyPercentage,
     Image,
     Integer,
     Length,
+    LengthPercentage,
     Number,
     Opacity,
     OpentypeTag,
@@ -41,6 +44,7 @@ enum class ValueType : u8 {
     Resolution,
     String,
     Time,
+    TimePercentage,
     TransformFunction,
     TransformList,
     Url,
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-properties-values-api/register-property-syntax-parsing.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-properties-values-api/register-property-syntax-parsing.txt
index 747edcfe9be..befecf4950f 100644
--- a/Tests/LibWeb/Text/expected/wpt-import/css/css-properties-values-api/register-property-syntax-parsing.txt
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-properties-values-api/register-property-syntax-parsing.txt
@@ -2,8 +2,8 @@ Harness status: OK
 
 Found 239 tests
 
-189 Pass
-50 Fail
+191 Pass
+48 Fail
 Pass	syntax:'*', initialValue:'a' is valid
 Pass	syntax:' * ', initialValue:'b' is valid
 Pass	syntax:'<length>', initialValue:'2px' is valid
@@ -32,8 +32,8 @@ Pass	syntax:'<length>', initialValue:'calc(7in - 12px)' is valid
 Pass	syntax:'<length>+', initialValue:'2px 7px calc(8px)' is valid
 Fail	syntax:'<length>#', initialValue:'2px, 7px, calc(8px)' is valid
 Pass	syntax:'<percentage>', initialValue:'-9.3e3%' is valid
-Fail	syntax:'<length-percentage>', initialValue:'-54%' is valid
-Fail	syntax:'<length-percentage>', initialValue:'0' is valid
+Pass	syntax:'<length-percentage>', initialValue:'-54%' is valid
+Pass	syntax:'<length-percentage>', initialValue:'0' is valid
 Fail	syntax:'<length-percentage>', initialValue:'calc(-11px + 10.4%)' is valid
 Pass	syntax:'<length>', initialValue:'10vmin' is valid
 Pass	syntax:'<percentage> | <length>+', initialValue:'calc(100vh - 10px) 30px' is valid