diff --git a/Libraries/LibWeb/Animations/KeyframeEffect.cpp b/Libraries/LibWeb/Animations/KeyframeEffect.cpp
index ffd7d6f7a6b..029013efab6 100644
--- a/Libraries/LibWeb/Animations/KeyframeEffect.cpp
+++ b/Libraries/LibWeb/Animations/KeyframeEffect.cpp
@@ -152,30 +152,21 @@ static WebIDL::ExceptionOr<KeyframeType<AL>> process_a_keyframe_like_object(JS::
     auto input_properties = TRY(keyframe_object.enumerable_own_property_names(JS::Object::PropertyKind::Key));
 
     Vector<String> animation_properties;
-    Optional<JS::Value> all_value;
 
     for (auto const& input_property : input_properties) {
         if (!input_property.is_string())
             continue;
 
         auto name = input_property.as_string().utf8_string();
-        if (name == "all"sv) {
-            all_value = TRY(keyframe_object.get(vm.names.all));
-            for (auto i = to_underlying(CSS::first_longhand_property_id); i <= to_underlying(CSS::last_longhand_property_id); ++i) {
-                auto property = static_cast<CSS::PropertyID>(i);
-                if (CSS::is_animatable_property(property))
-                    animation_properties.append(String { CSS::string_from_property_id(property) });
-            }
-        } else {
-            // Handle the two special cases
-            if (name == "cssFloat"sv || name == "cssOffset"sv) {
+
+        // Handle the two special cases
+        if (name == "cssFloat"sv || name == "cssOffset"sv) {
+            animation_properties.append(name);
+        } else if (name == "float"sv || name == "offset"sv) {
+            // Ignore these property names
+        } else if (auto property = CSS::property_id_from_camel_case_string(name); property.has_value()) {
+            if (CSS::is_animatable_property(property.value()))
                 animation_properties.append(name);
-            } else if (name == "float"sv || name == "offset"sv) {
-                // Ignore these property names
-            } else if (auto property = CSS::property_id_from_camel_case_string(name); property.has_value()) {
-                if (CSS::is_animatable_property(property.value()))
-                    animation_properties.append(name);
-            }
         }
     }
 
@@ -188,7 +179,7 @@ static WebIDL::ExceptionOr<KeyframeType<AL>> process_a_keyframe_like_object(JS::
         //    as the property key and keyframe input as the receiver.
         // 2. Check the completion record of raw value.
         JS::PropertyKey key { Utf16FlyString::from_utf8(property_name), JS::PropertyKey::StringMayBeNumber::No };
-        auto raw_value = TRY(keyframe_object.has_property(key)) ? TRY(keyframe_object.get(key)) : *all_value;
+        auto raw_value = TRY(keyframe_object.get(key));
 
         using PropertyValuesType = Conditional<AL == AllowLists::Yes, Vector<String>, String>;
         PropertyValuesType property_values;
diff --git a/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp b/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp
index 082d8c02c63..46aa2863c6f 100644
--- a/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp
+++ b/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp
@@ -5146,15 +5146,11 @@ RefPtr<StyleValue const> Parser::parse_transition_property_value(TokenStream<Com
     StyleValueVector transition_properties;
     for (auto const& value : transition_property_values) {
         TokenStream transition_property_tokens { value };
-        if (auto all_keyword_value = parse_all_as_single_keyword_value(transition_property_tokens, Keyword::All)) {
-            transition_properties.append(*all_keyword_value);
-        } else {
-            auto custom_ident = parse_custom_ident_value(transition_property_tokens, { { "all"sv, "none"sv } });
-            if (!custom_ident || transition_property_tokens.has_next_token())
-                return nullptr;
+        auto custom_ident = parse_custom_ident_value(transition_property_tokens, { { "none"sv } });
+        if (!custom_ident || transition_property_tokens.has_next_token())
+            return nullptr;
 
-            transition_properties.append(custom_ident.release_nonnull());
-        }
+        transition_properties.append(custom_ident.release_nonnull());
     }
     transaction.commit();
     return StyleValueList::create(move(transition_properties), StyleValueList::Separator::Comma);
diff --git a/Libraries/LibWeb/CSS/Properties.json b/Libraries/LibWeb/CSS/Properties.json
index e56c1e871b2..4247065be86 100644
--- a/Libraries/LibWeb/CSS/Properties.json
+++ b/Libraries/LibWeb/CSS/Properties.json
@@ -3888,10 +3888,9 @@
     "initial": "all",
     "multiplicity": "coordinating-list",
     "valid-types": [
-      "custom-ident ![all,none]"
+      "custom-ident ![none]"
     ],
     "valid-identifiers": [
-      "all",
       "none"
     ]
   },
diff --git a/Libraries/LibWeb/CSS/StyleComputer.cpp b/Libraries/LibWeb/CSS/StyleComputer.cpp
index cd5e8b157ce..7fc0667abea 100644
--- a/Libraries/LibWeb/CSS/StyleComputer.cpp
+++ b/Libraries/LibWeb/CSS/StyleComputer.cpp
@@ -1314,13 +1314,9 @@ static void compute_transitioned_properties(ComputedProperties const& style, DOM
         };
 
         if (property_value->is_keyword()) {
-            auto keyword = property_value->as_keyword().keyword();
-            if (keyword == Keyword::None) {
-                properties.append({});
-                continue;
-            }
-            if (keyword == Keyword::All)
-                properties_for_this_transition = expanded_longhands_for_shorthand(PropertyID::All);
+            VERIFY(property_value->to_keyword() == Keyword::None);
+            properties.append({});
+            continue;
         } else {
             auto maybe_property = property_id_from_string(property_value->as_custom_ident().custom_ident());
             if (!maybe_property.has_value()) {