LibWeb: Use IdentifierStyleValue for CSS 'list-style-type'

Libraries/LibWeb/CSS/Parser/CSSParser.cpp

@@ -464,6 +464,14 @@ static Optional<CSS::ValueID> value_id_from_string(const String& string)
         return CSS::ValueID::FullWidth;
     if (string.equals_ignoring_case("full-size-kana"))
         return CSS::ValueID::FullSizeKana;
+    if (string.equals_ignoring_case("disc"))
+        return CSS::ValueID::Disc;
+    if (string.equals_ignoring_case("circle"))
+        return CSS::ValueID::Circle;
+    if (string.equals_ignoring_case("square"))
+        return CSS::ValueID::Square;
+    if (string.equals_ignoring_case("decimal"))
+        return CSS::ValueID::Decimal;
     if (string.starts_with("-libweb-palette-", CaseSensitivity::CaseInsensitive))
         return value_id_for_palette_string(string.substring_view(16, string.length() - 16));
     return {};

Libraries/LibWeb/CSS/StyleProperties.cpp

@@ -453,4 +453,26 @@ Optional<CSS::TextTransform> StyleProperties::text_transform() const
     }
 }
 
+Optional<CSS::ListStyleType> StyleProperties::list_style_type() const
+{
+    auto value = property(CSS::PropertyID::ListStyleType);
+    if (!value.has_value())
+        return {};
+
+    switch (value.value()->to_identifier()) {
+    case CSS::ValueID::None:
+        return CSS::ListStyleType::None;
+    case CSS::ValueID::Disc:
+        return CSS::ListStyleType::Disc;
+    case CSS::ValueID::Circle:
+        return CSS::ListStyleType::Circle;
+    case CSS::ValueID::Square:
+        return CSS::ListStyleType::Square;
+    case CSS::ValueID::Decimal:
+        return CSS::ListStyleType::Decimal;
+    default:
+        return {};
+    }
+}
+
 }

Libraries/LibWeb/CSS/StyleProperties.h

@@ -68,6 +68,7 @@ public:
     Optional<CSS::LineStyle> line_style(CSS::PropertyID) const;
     Optional<CSS::TextDecorationLine> text_decoration_line() const;
     Optional<CSS::TextTransform> text_transform() const;
+    Optional<CSS::ListStyleType> list_style_type() const;
 
     const Gfx::Font& font() const
     {

Libraries/LibWeb/CSS/StyleValue.h

@@ -156,6 +156,10 @@ enum class ValueID {
     Lowercase,
     FullWidth,
     FullSizeKana,
+    Disc,
+    Circle,
+    Square,
+    Decimal,
 };
 
 enum class Position {
@@ -239,6 +243,14 @@ enum class LineStyle {
     Outset,
 };
 
+enum class ListStyleType {
+    None,
+    Disc,
+    Circle,
+    Square,
+    Decimal,
+};
+
 class StyleValue : public RefCounted<StyleValue> {
 public:
     virtual ~StyleValue();