LibWeb: Implement the `:volume-locked` pseudo-class

Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp

@@ -511,6 +511,8 @@ Parser::ParseErrorOr<Selector::SimpleSelector> Parser::parse_pseudo_simple_selec
             return make_pseudo_class_selector(Selector::SimpleSelector::PseudoClass::Type::Host);
         if (pseudo_name.equals_ignoring_ascii_case("visited"sv))
             return make_pseudo_class_selector(Selector::SimpleSelector::PseudoClass::Type::Visited);
+        if (pseudo_name.equals_ignoring_ascii_case("volume-locked"sv))
+            return make_pseudo_class_selector(Selector::SimpleSelector::PseudoClass::Type::VolumeLocked);
         if (pseudo_name.equals_ignoring_ascii_case("scope"sv))
             return make_pseudo_class_selector(Selector::SimpleSelector::PseudoClass::Type::Scope);
 

Userland/Libraries/LibWeb/CSS/Selector.cpp

@@ -235,6 +235,7 @@ ErrorOr<String> Selector::SimpleSelector::serialize() const
         case Selector::SimpleSelector::PseudoClass::Type::Paused:
         case Selector::SimpleSelector::PseudoClass::Type::Seeking:
         case Selector::SimpleSelector::PseudoClass::Type::Muted:
+        case Selector::SimpleSelector::PseudoClass::Type::VolumeLocked:
             // If the pseudo-class does not accept arguments append ":" (U+003A), followed by the name of the pseudo-class, to s.
             TRY(s.try_append(':'));
             TRY(s.try_append(pseudo_class_name(pseudo_class.type)));

Userland/Libraries/LibWeb/CSS/Selector.h

@@ -119,6 +119,7 @@ public:
                 Paused,
                 Seeking,
                 Muted,
+                VolumeLocked,
             };
             Type type;
 
@@ -316,6 +317,8 @@ constexpr StringView pseudo_class_name(Selector::SimpleSelector::PseudoClass::Ty
         return "seeking"sv;
     case Selector::SimpleSelector::PseudoClass::Type::Muted:
         return "muted"sv;
+    case Selector::SimpleSelector::PseudoClass::Type::VolumeLocked:
+        return "volume-locked"sv;
     }
     VERIFY_NOT_REACHED();
 }

Userland/Libraries/LibWeb/CSS/SelectorEngine.cpp

@@ -401,6 +401,11 @@ static inline bool matches_pseudo_class(CSS::Selector::SimpleSelector::PseudoCla
         auto const& media_element = static_cast<HTML::HTMLMediaElement const&>(element);
         return media_element.muted();
     }
+    case CSS::Selector::SimpleSelector::PseudoClass::Type::VolumeLocked: {
+        // FIXME: Currently we don't allow the user to specify an override volume, so this is always false.
+        //        Once we do, implement this!
+        return false;
+    }
     }
 
     return false;

Userland/Libraries/LibWeb/Dump.cpp

@@ -554,6 +554,9 @@ void dump_selector(StringBuilder& builder, CSS::Selector const& selector)
                 case CSS::Selector::SimpleSelector::PseudoClass::Type::Muted:
                     pseudo_class_description = "Muted";
                     break;
+                case CSS::Selector::SimpleSelector::PseudoClass::Type::VolumeLocked:
+                    pseudo_class_description = "VolumeLocked";
+                    break;
                 }
 
                 builder.appendff(" pseudo_class={}", pseudo_class_description);