diff --git a/Userland/Libraries/LibWeb/CSS/MediaQuery.cpp b/Userland/Libraries/LibWeb/CSS/MediaQuery.cpp
index 2253fcf535..8fbc3a143d 100644
--- a/Userland/Libraries/LibWeb/CSS/MediaQuery.cpp
+++ b/Userland/Libraries/LibWeb/CSS/MediaQuery.cpp
@@ -60,18 +60,18 @@ String MediaFeature::to_string() const
 
     switch (m_type) {
     case Type::IsTrue:
-        return serialize_an_identifier(m_name);
+        return string_from_media_feature_id(m_id);
     case Type::ExactValue:
-        return String::formatted("{}:{}", serialize_an_identifier(m_name), m_value->to_string());
+        return String::formatted("{}:{}", string_from_media_feature_id(m_id), m_value->to_string());
     case Type::MinValue:
-        return String::formatted("min-{}:{}", serialize_an_identifier(m_name), m_value->to_string());
+        return String::formatted("min-{}:{}", string_from_media_feature_id(m_id), m_value->to_string());
     case Type::MaxValue:
-        return String::formatted("max-{}:{}", serialize_an_identifier(m_name), m_value->to_string());
+        return String::formatted("max-{}:{}", string_from_media_feature_id(m_id), m_value->to_string());
     case Type::Range:
         if (!m_range->right_comparison.has_value())
-            return String::formatted("{} {} {}", m_range->left_value.to_string(), comparison_string(m_range->left_comparison), serialize_an_identifier(m_name));
+            return String::formatted("{} {} {}", m_range->left_value.to_string(), comparison_string(m_range->left_comparison), string_from_media_feature_id(m_id));
 
-        return String::formatted("{} {} {} {} {}", m_range->left_value.to_string(), comparison_string(m_range->left_comparison), serialize_an_identifier(m_name), comparison_string(*m_range->right_comparison), m_range->right_value->to_string());
+        return String::formatted("{} {} {} {} {}", m_range->left_value.to_string(), comparison_string(m_range->left_comparison), string_from_media_feature_id(m_id), comparison_string(*m_range->right_comparison), m_range->right_value->to_string());
     }
 
     VERIFY_NOT_REACHED();
@@ -79,7 +79,7 @@ String MediaFeature::to_string() const
 
 bool MediaFeature::evaluate(HTML::Window const& window) const
 {
-    auto maybe_queried_value = window.query_media_feature(m_name);
+    auto maybe_queried_value = window.query_media_feature(m_id);
     if (!maybe_queried_value.has_value())
         return false;
     auto queried_value = maybe_queried_value.release_value();
diff --git a/Userland/Libraries/LibWeb/CSS/MediaQuery.h b/Userland/Libraries/LibWeb/CSS/MediaQuery.h
index 9cf0357b67..2045a47d26 100644
--- a/Userland/Libraries/LibWeb/CSS/MediaQuery.h
+++ b/Userland/Libraries/LibWeb/CSS/MediaQuery.h
@@ -13,6 +13,7 @@
 #include <AK/OwnPtr.h>
 #include <AK/RefCounted.h>
 #include <LibWeb/CSS/GeneralEnclosed.h>
+#include <LibWeb/CSS/MediaFeatureID.h>
 #include <LibWeb/CSS/Ratio.h>
 #include <LibWeb/CSS/StyleValue.h>
 
@@ -101,25 +102,29 @@ public:
     };
 
     // Corresponds to `<mf-boolean>` grammar
-    static MediaFeature boolean(String const& name)
+    static MediaFeature boolean(MediaFeatureID id)
     {
-        return MediaFeature(Type::IsTrue, name);
+        return MediaFeature(Type::IsTrue, id);
     }
 
     // Corresponds to `<mf-plain>` grammar
-    static MediaFeature plain(String const& name, MediaFeatureValue value)
+    static MediaFeature plain(MediaFeatureID id, MediaFeatureValue value)
     {
-        if (name.starts_with("min-", CaseSensitivity::CaseInsensitive))
-            return MediaFeature(Type::MinValue, name.substring_view(4), move(value));
-        if (name.starts_with("max-", CaseSensitivity::CaseInsensitive))
-            return MediaFeature(Type::MaxValue, name.substring_view(4), move(value));
-        return MediaFeature(Type::ExactValue, move(name), move(value));
+        return MediaFeature(Type::ExactValue, move(id), move(value));
+    }
+    static MediaFeature min(MediaFeatureID id, MediaFeatureValue value)
+    {
+        return MediaFeature(Type::MinValue, id, move(value));
+    }
+    static MediaFeature max(MediaFeatureID id, MediaFeatureValue value)
+    {
+        return MediaFeature(Type::MaxValue, id, move(value));
     }
 
     // Corresponds to `<mf-range>` grammar, with a single comparison
-    static MediaFeature half_range(MediaFeatureValue value, Comparison comparison, String const& name)
+    static MediaFeature half_range(MediaFeatureValue value, Comparison comparison, MediaFeatureID id)
     {
-        MediaFeature feature { Type::Range, name };
+        MediaFeature feature { Type::Range, id };
         feature.m_range = Range {
             .left_value = value,
             .left_comparison = comparison,
@@ -128,9 +133,9 @@ public:
     }
 
     // Corresponds to `<mf-range>` grammar, with two comparisons
-    static MediaFeature range(MediaFeatureValue left_value, Comparison left_comparison, String const& name, Comparison right_comparison, MediaFeatureValue right_value)
+    static MediaFeature range(MediaFeatureValue left_value, Comparison left_comparison, MediaFeatureID id, Comparison right_comparison, MediaFeatureValue right_value)
     {
-        MediaFeature feature { Type::Range, name };
+        MediaFeature feature { Type::Range, id };
         feature.m_range = Range {
             .left_value = left_value,
             .left_comparison = left_comparison,
@@ -152,9 +157,9 @@ private:
         Range,
     };
 
-    MediaFeature(Type type, FlyString name, Optional<MediaFeatureValue> value = {})
+    MediaFeature(Type type, MediaFeatureID id, Optional<MediaFeatureValue> value = {})
         : m_type(type)
-        , m_name(move(name))
+        , m_id(move(id))
         , m_value(move(value))
     {
     }
@@ -169,7 +174,7 @@ private:
     };
 
     Type m_type;
-    FlyString m_name;
+    MediaFeatureID m_id;
     Optional<MediaFeatureValue> m_value {};
     Optional<Range> m_range {};
 };
diff --git a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
index 8fa6a84ecc..26bafb7251 100644
--- a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
@@ -877,20 +877,31 @@ Optional<MediaFeature> Parser::parse_media_feature(TokenStream<StyleComponentVal
     tokens.skip_whitespace();
 
     // `<mf-name> = <ident>`
-    auto parse_mf_name = [](auto& tokens, bool allow_min_max_prefix) -> Optional<String> {
+    struct MediaFeatureName {
+        enum Type {
+            Normal,
+            Min,
+            Max
+        } type;
+        MediaFeatureID id;
+    };
+    auto parse_mf_name = [](auto& tokens, bool allow_min_max_prefix) -> Optional<MediaFeatureName> {
         auto& token = tokens.peek_token();
         if (token.is(Token::Type::Ident)) {
             auto name = token.token().ident();
-            if (is_media_feature_name(name)) {
+            if (auto id = media_feature_id_from_string(name); id.has_value()) {
                 tokens.next_token();
-                return name;
+                return MediaFeatureName { MediaFeatureName::Type::Normal, id.value() };
             }
 
             if (allow_min_max_prefix && (name.starts_with("min-", CaseSensitivity::CaseInsensitive) || name.starts_with("max-", CaseSensitivity::CaseInsensitive))) {
                 auto adjusted_name = name.substring_view(4);
-                if (is_media_feature_name(adjusted_name)) {
+                if (auto id = media_feature_id_from_string(adjusted_name); id.has_value()) {
                     tokens.next_token();
-                    return name;
+                    return MediaFeatureName {
+                        name.starts_with("min-", CaseSensitivity::CaseInsensitive) ? MediaFeatureName::Type::Min : MediaFeatureName::Type::Max,
+                        id.value()
+                    };
                 }
             }
         }
@@ -902,11 +913,10 @@ Optional<MediaFeature> Parser::parse_media_feature(TokenStream<StyleComponentVal
         auto position = tokens.position();
         tokens.skip_whitespace();
 
-        auto maybe_name = parse_mf_name(tokens, false);
-        if (maybe_name.has_value()) {
+        if (auto maybe_name = parse_mf_name(tokens, false); maybe_name.has_value()) {
             tokens.skip_whitespace();
             if (!tokens.has_next_token())
-                return MediaFeature::boolean(maybe_name.release_value());
+                return MediaFeature::boolean(maybe_name->id);
         }
 
         tokens.rewind_to_position(position);
@@ -924,8 +934,17 @@ Optional<MediaFeature> Parser::parse_media_feature(TokenStream<StyleComponentVal
                 tokens.skip_whitespace();
                 if (auto maybe_value = parse_media_feature_value(tokens); maybe_value.has_value()) {
                     tokens.skip_whitespace();
-                    if (!tokens.has_next_token())
-                        return MediaFeature::plain(maybe_name.release_value(), maybe_value.release_value());
+                    if (!tokens.has_next_token()) {
+                        switch (maybe_name->type) {
+                        case MediaFeatureName::Type::Normal:
+                            return MediaFeature::plain(maybe_name->id, maybe_value.release_value());
+                        case MediaFeatureName::Type::Min:
+                            return MediaFeature::min(maybe_name->id, maybe_value.release_value());
+                        case MediaFeatureName::Type::Max:
+                            return MediaFeature::max(maybe_name->id, maybe_value.release_value());
+                        }
+                        VERIFY_NOT_REACHED();
+                    }
                 }
             }
         }
@@ -1016,7 +1035,7 @@ Optional<MediaFeature> Parser::parse_media_feature(TokenStream<StyleComponentVal
                 if (auto maybe_value = parse_media_feature_value(tokens); maybe_value.has_value()) {
                     tokens.skip_whitespace();
                     if (!tokens.has_next_token() && !maybe_value->is_ident())
-                        return MediaFeature::half_range(maybe_value.release_value(), flip(maybe_comparison.release_value()), maybe_name.release_value());
+                        return MediaFeature::half_range(maybe_value.release_value(), flip(maybe_comparison.release_value()), maybe_name->id);
                 }
             }
         }
@@ -1032,7 +1051,7 @@ Optional<MediaFeature> Parser::parse_media_feature(TokenStream<StyleComponentVal
                     tokens.skip_whitespace();
 
                     if (!tokens.has_next_token())
-                        return MediaFeature::half_range(maybe_left_value.release_value(), maybe_left_comparison.release_value(), maybe_name.release_value());
+                        return MediaFeature::half_range(maybe_left_value.release_value(), maybe_left_comparison.release_value(), maybe_name->id);
 
                     if (auto maybe_right_comparison = parse_comparison(tokens); maybe_right_comparison.has_value()) {
                         tokens.skip_whitespace();
@@ -1049,7 +1068,7 @@ Optional<MediaFeature> Parser::parse_media_feature(TokenStream<StyleComponentVal
                                 && comparisons_match(left_comparison, right_comparison)
                                 && left_comparison != MediaFeature::Comparison::Equal
                                 && !maybe_left_value->is_ident() && !maybe_right_value->is_ident()) {
-                                return MediaFeature::range(maybe_left_value.release_value(), left_comparison, maybe_name.release_value(), right_comparison, maybe_right_value.release_value());
+                                return MediaFeature::range(maybe_left_value.release_value(), left_comparison, maybe_name->id, right_comparison, maybe_right_value.release_value());
                             }
                         }
                     }
diff --git a/Userland/Libraries/LibWeb/HTML/Window.cpp b/Userland/Libraries/LibWeb/HTML/Window.cpp
index d8437d1064..f712eff310 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Window.cpp
@@ -372,52 +372,53 @@ NonnullRefPtr<CSS::MediaQueryList> Window::match_media(String media)
     return media_query_list;
 }
 
-Optional<CSS::MediaFeatureValue> Window::query_media_feature(FlyString const& name) const
+Optional<CSS::MediaFeatureValue> Window::query_media_feature(CSS::MediaFeatureID media_feature) const
 {
     // FIXME: Many of these should be dependent on the hardware
 
     // MEDIAQUERIES-4 properties - https://www.w3.org/TR/mediaqueries-4/#media-descriptor-table
-    if (name.equals_ignoring_case("any-hover"sv))
+    switch (media_feature) {
+    case CSS::MediaFeatureID::AnyHover:
         return CSS::MediaFeatureValue("hover");
-    if (name.equals_ignoring_case("any-pointer"sv))
+    case CSS::MediaFeatureID::AnyPointer:
         return CSS::MediaFeatureValue("fine");
-    if (name.equals_ignoring_case("aspect-ratio"sv))
+    case CSS::MediaFeatureID::AspectRatio:
         return CSS::MediaFeatureValue(CSS::Ratio(inner_width(), inner_height()));
-    if (name.equals_ignoring_case("color"sv))
+    case CSS::MediaFeatureID::Color:
         return CSS::MediaFeatureValue(8);
-    if (name.equals_ignoring_case("color-gamut"sv))
+    case CSS::MediaFeatureID::ColorGamut:
         return CSS::MediaFeatureValue("srgb");
-    if (name.equals_ignoring_case("color-index"sv))
+    case CSS::MediaFeatureID::ColorIndex:
         return CSS::MediaFeatureValue(0);
     // FIXME: device-aspect-ratio
     // FIXME: device-height
     // FIXME: device-width
-    if (name.equals_ignoring_case("grid"sv))
+    case CSS::MediaFeatureID::Grid:
         return CSS::MediaFeatureValue(0);
-    if (name.equals_ignoring_case("height"sv))
+    case CSS::MediaFeatureID::Height:
         return CSS::MediaFeatureValue(CSS::Length::make_px(inner_height()));
-    if (name.equals_ignoring_case("hover"sv))
+    case CSS::MediaFeatureID::Hover:
         return CSS::MediaFeatureValue("hover");
-    if (name.equals_ignoring_case("monochrome"sv))
+    case CSS::MediaFeatureID::Monochrome:
         return CSS::MediaFeatureValue(0);
-    if (name.equals_ignoring_case("orientation"sv))
+    case CSS::MediaFeatureID::Orientation:
         return CSS::MediaFeatureValue(inner_height() >= inner_width() ? "portrait" : "landscape");
-    if (name.equals_ignoring_case("overflow-block"sv))
+    case CSS::MediaFeatureID::OverflowBlock:
         return CSS::MediaFeatureValue("scroll");
-    if (name.equals_ignoring_case("overflow-inline"sv))
+    case CSS::MediaFeatureID::OverflowInline:
         return CSS::MediaFeatureValue("scroll");
-    if (name.equals_ignoring_case("pointer"sv))
+    case CSS::MediaFeatureID::Pointer:
         return CSS::MediaFeatureValue("fine");
     // FIXME: resolution
-    if (name.equals_ignoring_case("scan"sv))
+    case CSS::MediaFeatureID::Scan:
         return CSS::MediaFeatureValue("progressive");
-    if (name.equals_ignoring_case("update"sv))
+    case CSS::MediaFeatureID::Update:
         return CSS::MediaFeatureValue("fast");
-    if (name.equals_ignoring_case("width"sv))
+    case CSS::MediaFeatureID::Width:
         return CSS::MediaFeatureValue(CSS::Length::make_px(inner_width()));
 
     // MEDIAQUERIES-5 properties - https://www.w3.org/TR/mediaqueries-5/#media-descriptor-table
-    if (name.equals_ignoring_case("prefers-color-scheme")) {
+    case CSS::MediaFeatureID::PrefersColorScheme: {
         if (auto* page = this->page()) {
             switch (page->preferred_color_scheme()) {
             case CSS::PreferredColorScheme::Light:
@@ -429,6 +430,11 @@ Optional<CSS::MediaFeatureValue> Window::query_media_feature(FlyString const& na
                 return CSS::MediaFeatureValue(page->palette().is_dark() ? "dark" : "light");
             }
         }
+        return CSS::MediaFeatureValue(CSS::ValueID::Light);
+    }
+
+    default:
+        break;
     }
 
     return {};
diff --git a/Userland/Libraries/LibWeb/HTML/Window.h b/Userland/Libraries/LibWeb/HTML/Window.h
index f9bca0fa15..cb6c7414f5 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.h
+++ b/Userland/Libraries/LibWeb/HTML/Window.h
@@ -89,7 +89,7 @@ public:
 
     NonnullRefPtr<CSS::CSSStyleDeclaration> get_computed_style(DOM::Element&) const;
     NonnullRefPtr<CSS::MediaQueryList> match_media(String);
-    Optional<CSS::MediaFeatureValue> query_media_feature(FlyString const&) const;
+    Optional<CSS::MediaFeatureValue> query_media_feature(CSS::MediaFeatureID) const;
 
     float scroll_x() const;
     float scroll_y() const;