diff --git a/Libraries/LibHTML/CSS/PropertyID.h b/Libraries/LibHTML/CSS/PropertyID.h
new file mode 100644
index 0000000000..6e2be9e091
--- /dev/null
+++ b/Libraries/LibHTML/CSS/PropertyID.h
@@ -0,0 +1,62 @@
+#pragma once
+
+#include <AK/Traits.h>
+
+namespace CSS {
+enum class PropertyID {
+    Invalid,
+
+    BackgroundColor,
+    BorderBottomColor,
+    BorderBottomStyle,
+    BorderBottomWidth,
+    BorderCollapse,
+    BorderLeftColor,
+    BorderLeftStyle,
+    BorderLeftWidth,
+    BorderRightColor,
+    BorderRightStyle,
+    BorderRightWidth,
+    BorderSpacing,
+    BorderTopColor,
+    BorderTopStyle,
+    BorderTopWidth,
+    Color,
+    Display,
+    FontFamily,
+    FontSize,
+    FontStyle,
+    FontVariant,
+    FontWeight,
+    Height,
+    LetterSpacing,
+    LineHeight,
+    ListStyle,
+    ListStyleImage,
+    ListStylePosition,
+    ListStyleType,
+    MarginBottom,
+    MarginLeft,
+    MarginRight,
+    MarginTop,
+    PaddingBottom,
+    PaddingLeft,
+    PaddingRight,
+    PaddingTop,
+    TextAlign,
+    TextDecoration,
+    TextIndent,
+    TextTransform,
+    Visibility,
+    WhiteSpace,
+    Width,
+    WordSpacing,
+};
+}
+
+namespace AK {
+template<>
+struct Traits<CSS::PropertyID> : public GenericTraits<CSS::PropertyID> {
+    static unsigned hash(CSS::PropertyID property_id) { return int_hash((unsigned)property_id); }
+};
+}
diff --git a/Libraries/LibHTML/CSS/StyleDeclaration.h b/Libraries/LibHTML/CSS/StyleDeclaration.h
index 9dd6c70509..55620b1516 100644
--- a/Libraries/LibHTML/CSS/StyleDeclaration.h
+++ b/Libraries/LibHTML/CSS/StyleDeclaration.h
@@ -4,7 +4,7 @@
 #include <LibHTML/CSS/StyleValue.h>
 
 struct StyleProperty {
-    String name;
+    CSS::PropertyID property_id;
     NonnullRefPtr<StyleValue> value;
     bool important { false };
 };
diff --git a/Libraries/LibHTML/CSS/StyleProperties.cpp b/Libraries/LibHTML/CSS/StyleProperties.cpp
index d397853491..2c74171e28 100644
--- a/Libraries/LibHTML/CSS/StyleProperties.cpp
+++ b/Libraries/LibHTML/CSS/StyleProperties.cpp
@@ -2,38 +2,38 @@
 #include <LibHTML/CSS/StyleProperties.h>
 #include <ctype.h>
 
-void StyleProperties::set_property(const String& name, NonnullRefPtr<StyleValue> value)
+void StyleProperties::set_property(CSS::PropertyID id, NonnullRefPtr<StyleValue> value)
 {
-    m_property_values.set(name, move(value));
+    m_property_values.set((unsigned)id, move(value));
 }
 
-Optional<NonnullRefPtr<StyleValue>> StyleProperties::property(const String& name) const
+Optional<NonnullRefPtr<StyleValue>> StyleProperties::property(CSS::PropertyID id) const
 {
-    auto it = m_property_values.find(name);
+    auto it = m_property_values.find((unsigned)id);
     if (it == m_property_values.end())
         return {};
     return it->value;
 }
 
-Length StyleProperties::length_or_fallback(const StringView& property_name, const Length& fallback) const
+Length StyleProperties::length_or_fallback(CSS::PropertyID id, const Length& fallback) const
 {
-    auto value = property(property_name);
+    auto value = property(id);
     if (!value.has_value())
         return fallback;
     return value.value()->to_length();
 }
 
-String StyleProperties::string_or_fallback(const StringView& property_name, const StringView& fallback) const
+String StyleProperties::string_or_fallback(CSS::PropertyID id, const StringView& fallback) const
 {
-    auto value = property(property_name);
+    auto value = property(id);
     if (!value.has_value())
         return fallback;
     return value.value()->to_string();
 }
 
-Color StyleProperties::color_or_fallback(const StringView& property_name, const Document& document, Color fallback) const
+Color StyleProperties::color_or_fallback(CSS::PropertyID id, const Document& document, Color fallback) const
 {
-    auto value = property(property_name);
+    auto value = property(id);
     if (!value.has_value())
         return fallback;
     return value.value()->to_color(document);
@@ -41,8 +41,8 @@ Color StyleProperties::color_or_fallback(const StringView& property_name, const
 
 void StyleProperties::load_font() const
 {
-    auto font_family = string_or_fallback("font-family", "Katica");
-    auto font_weight = string_or_fallback("font-weight", "normal");
+    auto font_family = string_or_fallback(CSS::PropertyID::FontFamily, "Katica");
+    auto font_weight = string_or_fallback(CSS::PropertyID::FontWeight, "normal");
 
     String weight;
     if (font_weight == "lighter")
diff --git a/Libraries/LibHTML/CSS/StyleProperties.h b/Libraries/LibHTML/CSS/StyleProperties.h
index 4a551a8c5f..650836eed1 100644
--- a/Libraries/LibHTML/CSS/StyleProperties.h
+++ b/Libraries/LibHTML/CSS/StyleProperties.h
@@ -15,15 +15,15 @@ public:
     inline void for_each_property(Callback callback) const
     {
         for (auto& it : m_property_values)
-            callback(it.key, *it.value);
+            callback((CSS::PropertyID)it.key, *it.value);
     }
 
-    void set_property(const String& name, NonnullRefPtr<StyleValue> value);
-    Optional<NonnullRefPtr<StyleValue>> property(const String& name) const;
+    void set_property(CSS::PropertyID, NonnullRefPtr<StyleValue> value);
+    Optional<NonnullRefPtr<StyleValue>> property(CSS::PropertyID) const;
 
-    Length length_or_fallback(const StringView& property_name, const Length& fallback) const;
-    String string_or_fallback(const StringView& property_name, const StringView& fallback) const;
-    Color color_or_fallback(const StringView& property_name, const Document&, Color fallback) const;
+    Length length_or_fallback(CSS::PropertyID, const Length& fallback) const;
+    String string_or_fallback(CSS::PropertyID, const StringView& fallback) const;
+    Color color_or_fallback(CSS::PropertyID, const Document&, Color fallback) const;
 
     const Font& font() const
     {
@@ -33,7 +33,7 @@ public:
     }
 
 private:
-    HashMap<String, NonnullRefPtr<StyleValue>> m_property_values;
+    HashMap<unsigned, NonnullRefPtr<StyleValue>> m_property_values;
 
     void load_font() const;
 
diff --git a/Libraries/LibHTML/CSS/StyleResolver.cpp b/Libraries/LibHTML/CSS/StyleResolver.cpp
index 1745084414..76c4a34ae0 100644
--- a/Libraries/LibHTML/CSS/StyleResolver.cpp
+++ b/Libraries/LibHTML/CSS/StyleResolver.cpp
@@ -61,37 +61,36 @@ NonnullRefPtrVector<StyleRule> StyleResolver::collect_matching_rules(const Eleme
     return matching_rules;
 }
 
-bool StyleResolver::is_inherited_property(const StringView& name)
+bool StyleResolver::is_inherited_property(CSS::PropertyID property_id)
 {
-    static HashTable<String> inherited_properties;
+    static HashTable<CSS::PropertyID> inherited_properties;
     if (inherited_properties.is_empty()) {
-        inherited_properties.set("border-collapse");
-        inherited_properties.set("border-spacing");
-        inherited_properties.set("color");
-        inherited_properties.set("font-family");
-        inherited_properties.set("font-size");
-        inherited_properties.set("font-style");
-        inherited_properties.set("font-variant");
-        inherited_properties.set("font-weight");
-        inherited_properties.set("font");
-        inherited_properties.set("letter-spacing");
-        inherited_properties.set("line-height");
-        inherited_properties.set("list-style-image");
-        inherited_properties.set("list-style-position");
-        inherited_properties.set("list-style-type");
-        inherited_properties.set("list-style");
-        inherited_properties.set("text-align");
-        inherited_properties.set("text-indent");
-        inherited_properties.set("text-transform");
-        inherited_properties.set("visibility");
-        inherited_properties.set("white-space");
-        inherited_properties.set("word-spacing");
+        inherited_properties.set(CSS::PropertyID::BorderCollapse);
+        inherited_properties.set(CSS::PropertyID::BorderSpacing);
+        inherited_properties.set(CSS::PropertyID::Color);
+        inherited_properties.set(CSS::PropertyID::FontFamily);
+        inherited_properties.set(CSS::PropertyID::FontSize);
+        inherited_properties.set(CSS::PropertyID::FontStyle);
+        inherited_properties.set(CSS::PropertyID::FontVariant);
+        inherited_properties.set(CSS::PropertyID::FontWeight);
+        inherited_properties.set(CSS::PropertyID::LetterSpacing);
+        inherited_properties.set(CSS::PropertyID::LineHeight);
+        inherited_properties.set(CSS::PropertyID::ListStyle);
+        inherited_properties.set(CSS::PropertyID::ListStyleImage);
+        inherited_properties.set(CSS::PropertyID::ListStylePosition);
+        inherited_properties.set(CSS::PropertyID::ListStyleType);
+        inherited_properties.set(CSS::PropertyID::TextAlign);
+        inherited_properties.set(CSS::PropertyID::TextIndent);
+        inherited_properties.set(CSS::PropertyID::TextTransform);
+        inherited_properties.set(CSS::PropertyID::Visibility);
+        inherited_properties.set(CSS::PropertyID::WhiteSpace);
+        inherited_properties.set(CSS::PropertyID::WordSpacing);
 
         // FIXME: This property is not supposed to be inherited, but we currently
         //        rely on inheritance to propagate decorations into line boxes.
-        inherited_properties.set("text-decoration");
+        inherited_properties.set(CSS::PropertyID::TextDecoration);
     }
-    return inherited_properties.contains(name);
+    return inherited_properties.contains(property_id);
 }
 
 NonnullRefPtr<StyleProperties> StyleResolver::resolve_style(const Element& element, const StyleProperties* parent_style) const
@@ -99,9 +98,9 @@ NonnullRefPtr<StyleProperties> StyleResolver::resolve_style(const Element& eleme
     auto style = StyleProperties::create();
 
     if (parent_style) {
-        parent_style->for_each_property([&](const StringView& name, auto& value) {
-            if (is_inherited_property(name))
-                style->set_property(name, value);
+        parent_style->for_each_property([&](auto property_id, auto& value) {
+            if (is_inherited_property(property_id))
+                style->set_property(property_id, value);
         });
     }
 
@@ -110,7 +109,7 @@ NonnullRefPtr<StyleProperties> StyleResolver::resolve_style(const Element& eleme
     auto matching_rules = collect_matching_rules(element);
     for (auto& rule : matching_rules) {
         for (auto& property : rule.declaration().properties()) {
-            style->set_property(property.name, property.value);
+            style->set_property(property.property_id, property.value);
         }
     }
 
@@ -118,7 +117,7 @@ NonnullRefPtr<StyleProperties> StyleResolver::resolve_style(const Element& eleme
     if (!style_attribute.is_null()) {
         if (auto declaration = parse_css_declaration(style_attribute)) {
             for (auto& property : declaration->properties()) {
-                style->set_property(property.name, property.value);
+                style->set_property(property.property_id, property.value);
             }
         }
     }
diff --git a/Libraries/LibHTML/CSS/StyleResolver.h b/Libraries/LibHTML/CSS/StyleResolver.h
index fd0a358374..49d59704f0 100644
--- a/Libraries/LibHTML/CSS/StyleResolver.h
+++ b/Libraries/LibHTML/CSS/StyleResolver.h
@@ -22,7 +22,7 @@ public:
 
     NonnullRefPtrVector<StyleRule> collect_matching_rules(const Element&) const;
 
-    static bool is_inherited_property(const StringView&);
+    static bool is_inherited_property(CSS::PropertyID);
 
 private:
     template<typename Callback>
diff --git a/Libraries/LibHTML/CSS/StyleValue.h b/Libraries/LibHTML/CSS/StyleValue.h
index 3a0f43e69b..1cfa3d1c3b 100644
--- a/Libraries/LibHTML/CSS/StyleValue.h
+++ b/Libraries/LibHTML/CSS/StyleValue.h
@@ -6,6 +6,7 @@
 #include <AK/StringView.h>
 #include <LibDraw/Color.h>
 #include <LibHTML/CSS/Length.h>
+#include <LibHTML/CSS/PropertyID.h>
 
 class Document;
 
diff --git a/Libraries/LibHTML/DOM/Document.cpp b/Libraries/LibHTML/DOM/Document.cpp
index 4543c897ae..5d6d45a9d8 100644
--- a/Libraries/LibHTML/DOM/Document.cpp
+++ b/Libraries/LibHTML/DOM/Document.cpp
@@ -92,7 +92,7 @@ Color Document::background_color() const
     if (!body_layout_node)
         return Color::White;
 
-    auto background_color = body_layout_node->style().property("background-color");
+    auto background_color = body_layout_node->style().property(CSS::PropertyID::BackgroundColor);
     if (!background_color.has_value() || !background_color.value()->is_color())
         return Color::White;
 
diff --git a/Libraries/LibHTML/DOM/Element.cpp b/Libraries/LibHTML/DOM/Element.cpp
index 19dd68d121..5ef79e9986 100644
--- a/Libraries/LibHTML/DOM/Element.cpp
+++ b/Libraries/LibHTML/DOM/Element.cpp
@@ -73,7 +73,7 @@ RefPtr<LayoutNode> Element::create_layout_node(const StyleResolver& resolver, co
 {
     auto style = resolver.resolve_style(*this, parent_style);
 
-    auto display_property = style->property("display");
+    auto display_property = style->property(CSS::PropertyID::Display);
     String display = display_property.has_value() ? display_property.release_value()->to_string() : "inline";
 
     if (display == "none")
diff --git a/Libraries/LibHTML/DOM/HTMLBodyElement.cpp b/Libraries/LibHTML/DOM/HTMLBodyElement.cpp
index 14a0b9b234..724bf31459 100644
--- a/Libraries/LibHTML/DOM/HTMLBodyElement.cpp
+++ b/Libraries/LibHTML/DOM/HTMLBodyElement.cpp
@@ -18,11 +18,11 @@ void HTMLBodyElement::apply_presentational_hints(StyleProperties& style) const
         if (name == "bgcolor") {
             auto color = Color::from_string(value);
             if (color.has_value())
-                style.set_property("background-color", ColorStyleValue::create(color.value()));
+                style.set_property(CSS::PropertyID::BackgroundColor, ColorStyleValue::create(color.value()));
         } else if (name == "text") {
             auto color = Color::from_string(value);
             if (color.has_value())
-                style.set_property("color", ColorStyleValue::create(color.value()));
+                style.set_property(CSS::PropertyID::Color, ColorStyleValue::create(color.value()));
         }
     });
 }
diff --git a/Libraries/LibHTML/DOM/HTMLFontElement.cpp b/Libraries/LibHTML/DOM/HTMLFontElement.cpp
index 56ff2e8848..fca7ad0f04 100644
--- a/Libraries/LibHTML/DOM/HTMLFontElement.cpp
+++ b/Libraries/LibHTML/DOM/HTMLFontElement.cpp
@@ -17,7 +17,7 @@ void HTMLFontElement::apply_presentational_hints(StyleProperties& style) const
         if (name == "color") {
             auto color = Color::from_string(value);
             if (color.has_value())
-                style.set_property("color", ColorStyleValue::create(color.value()));
+                style.set_property(CSS::PropertyID::Color, ColorStyleValue::create(color.value()));
         }
     });
 }
diff --git a/Libraries/LibHTML/DOM/HTMLImageElement.cpp b/Libraries/LibHTML/DOM/HTMLImageElement.cpp
index 1210fe297e..846318fd20 100644
--- a/Libraries/LibHTML/DOM/HTMLImageElement.cpp
+++ b/Libraries/LibHTML/DOM/HTMLImageElement.cpp
@@ -59,7 +59,7 @@ RefPtr<LayoutNode> HTMLImageElement::create_layout_node(const StyleResolver& res
 {
     auto style = resolver.resolve_style(*this, parent_style);
 
-    auto display_property = style->property("display");
+    auto display_property = style->property(CSS::PropertyID::Display);
     String display = display_property.has_value() ? display_property.release_value()->to_string() : "inline";
 
     if (display == "none")
diff --git a/Libraries/LibHTML/Dump.cpp b/Libraries/LibHTML/Dump.cpp
index 62619de074..82458f44b0 100644
--- a/Libraries/LibHTML/Dump.cpp
+++ b/Libraries/LibHTML/Dump.cpp
@@ -114,10 +114,10 @@ void dump_tree(const LayoutNode& layout_node)
         }
     }
 
-    layout_node.style().for_each_property([&](auto& key, auto& value) {
+    layout_node.style().for_each_property([&](auto property_id, auto& value) {
         for (int i = 0; i < indent; ++i)
             dbgprintf("    ");
-        dbgprintf("  (%s: %s)\n", key.characters(), value.to_string().characters());
+        dbgprintf("  (CSS::PropertyID(%u): %s)\n", (unsigned)property_id, value.to_string().characters());
     });
 
     ++indent;
@@ -170,7 +170,7 @@ void dump_rule(const StyleRule& rule)
     }
     dbgprintf("  Declarations:\n");
     for (auto& property : rule.declaration().properties()) {
-        dbgprintf("    '%s': '%s'\n", property.name.characters(), property.value->to_string().characters());
+        dbgprintf("    CSS::PropertyID(%u): '%s'\n", (unsigned)property.property_id, property.value->to_string().characters());
     }
 }
 
diff --git a/Libraries/LibHTML/Layout/LayoutBlock.cpp b/Libraries/LibHTML/Layout/LayoutBlock.cpp
index a4db9dbdf3..3f3e95c625 100644
--- a/Libraries/LibHTML/Layout/LayoutBlock.cpp
+++ b/Libraries/LibHTML/Layout/LayoutBlock.cpp
@@ -83,13 +83,13 @@ void LayoutBlock::compute_width()
 
     auto auto_value = Length();
     auto zero_value = Length(0, Length::Type::Absolute);
-    auto width = style.length_or_fallback("width", auto_value);
-    auto margin_left = style.length_or_fallback("margin-left", zero_value);
-    auto margin_right = style.length_or_fallback("margin-right", zero_value);
-    auto border_left = style.length_or_fallback("border-left", zero_value);
-    auto border_right = style.length_or_fallback("border-right", zero_value);
-    auto padding_left = style.length_or_fallback("padding-left", zero_value);
-    auto padding_right = style.length_or_fallback("padding-right", zero_value);
+    auto width = style.length_or_fallback(CSS::PropertyID::Width, auto_value);
+    auto margin_left = style.length_or_fallback(CSS::PropertyID::MarginLeft, zero_value);
+    auto margin_right = style.length_or_fallback(CSS::PropertyID::MarginRight, zero_value);
+    auto border_left = style.length_or_fallback(CSS::PropertyID::BorderLeftWidth, zero_value);
+    auto border_right = style.length_or_fallback(CSS::PropertyID::BorderRightWidth, zero_value);
+    auto padding_left = style.length_or_fallback(CSS::PropertyID::PaddingLeft, zero_value);
+    auto padding_right = style.length_or_fallback(CSS::PropertyID::PaddingRight, zero_value);
 
 #ifdef HTML_DEBUG
     dbg() << " Left: " << margin_left << "+" << border_left << "+" << padding_left;
@@ -158,14 +158,14 @@ void LayoutBlock::compute_position()
     auto auto_value = Length();
     auto zero_value = Length(0, Length::Type::Absolute);
 
-    auto width = style.length_or_fallback("width", auto_value);
+    auto width = style.length_or_fallback(CSS::PropertyID::Width, auto_value);
 
-    box_model().margin().top = style.length_or_fallback("margin-top", zero_value);
-    box_model().margin().bottom = style.length_or_fallback("margin-bottom", zero_value);
-    box_model().border().top = style.length_or_fallback("border-top", zero_value);
-    box_model().border().bottom = style.length_or_fallback("border-bottom", zero_value);
-    box_model().padding().top = style.length_or_fallback("padding-top", zero_value);
-    box_model().padding().bottom = style.length_or_fallback("padding-bottom", zero_value);
+    box_model().margin().top = style.length_or_fallback(CSS::PropertyID::MarginTop, zero_value);
+    box_model().margin().bottom = style.length_or_fallback(CSS::PropertyID::MarginBottom, zero_value);
+    box_model().border().top = style.length_or_fallback(CSS::PropertyID::BorderTopWidth, zero_value);
+    box_model().border().bottom = style.length_or_fallback(CSS::PropertyID::BorderBottomWidth, zero_value);
+    box_model().padding().top = style.length_or_fallback(CSS::PropertyID::PaddingTop, zero_value);
+    box_model().padding().bottom = style.length_or_fallback(CSS::PropertyID::PaddingBottom, zero_value);
     rect().set_x(containing_block()->rect().x() + box_model().margin().left.to_px() + box_model().border().left.to_px() + box_model().padding().left.to_px());
 
     int top_border = -1;
@@ -184,7 +184,7 @@ void LayoutBlock::compute_height()
 {
     auto& style = this->style();
 
-    auto height_property = style.property("height");
+    auto height_property = style.property(CSS::PropertyID::Height);
     if (!height_property.has_value())
         return;
     auto height_length = height_property.value()->to_length();
@@ -197,7 +197,7 @@ void LayoutBlock::render(RenderingContext& context)
     LayoutNode::render(context);
 
     // FIXME: position this properly
-    if (style().string_or_fallback("display", "block") == "list-item") {
+    if (style().string_or_fallback(CSS::PropertyID::Display, "block") == "list-item") {
         Rect bullet_rect {
             rect().x() - 8,
             rect().y() + 4,
@@ -205,7 +205,7 @@ void LayoutBlock::render(RenderingContext& context)
             3
         };
 
-        context.painter().fill_rect(bullet_rect, style().color_or_fallback("color", document(), Color::Black));
+        context.painter().fill_rect(bullet_rect, style().color_or_fallback(CSS::PropertyID::Color, document(), Color::Black));
     }
 
     if (children_are_inline()) {
@@ -242,9 +242,9 @@ NonnullRefPtr<StyleProperties> LayoutBlock::style_for_anonymous_block() const
 {
     auto new_style = StyleProperties::create();
 
-    style().for_each_property([&](auto& name, auto& value) {
-        if (StyleResolver::is_inherited_property(name))
-            new_style->set_property(name, value);
+    style().for_each_property([&](auto property_id, auto& value) {
+        if (StyleResolver::is_inherited_property(property_id))
+            new_style->set_property(property_id, value);
     });
 
     return new_style;
diff --git a/Libraries/LibHTML/Layout/LayoutImage.cpp b/Libraries/LibHTML/Layout/LayoutImage.cpp
index d81e2e7b6a..82a111c04a 100644
--- a/Libraries/LibHTML/Layout/LayoutImage.cpp
+++ b/Libraries/LibHTML/Layout/LayoutImage.cpp
@@ -40,7 +40,7 @@ void LayoutImage::render(RenderingContext& context)
         auto alt = node().alt();
         if (alt.is_empty())
             alt = node().src();
-        context.painter().draw_text(rect(), alt, TextAlignment::Center, style().color_or_fallback("color", document(), Color::Black), TextElision::Right);
+        context.painter().draw_text(rect(), alt, TextAlignment::Center, style().color_or_fallback(CSS::PropertyID::Color, document(), Color::Black), TextElision::Right);
     } else {
         context.painter().draw_scaled_bitmap(rect(), *node().bitmap(), node().bitmap()->rect());
     }
diff --git a/Libraries/LibHTML/Layout/LayoutNode.cpp b/Libraries/LibHTML/Layout/LayoutNode.cpp
index 3be9e7aca2..3527c3dbd1 100644
--- a/Libraries/LibHTML/Layout/LayoutNode.cpp
+++ b/Libraries/LibHTML/Layout/LayoutNode.cpp
@@ -52,14 +52,15 @@ void LayoutNode::render(RenderingContext& context)
     padded_rect.set_y(rect().y() - box_model().padding().top.to_px());
     padded_rect.set_height(rect().height() + box_model().padding().top.to_px() + box_model().padding().bottom.to_px());
 
-    auto bgcolor = style().property("background-color");
+    auto bgcolor = style().property(CSS::PropertyID::BackgroundColor);
     if (bgcolor.has_value() && bgcolor.value()->is_color()) {
         context.painter().fill_rect(padded_rect, bgcolor.value()->to_color(document()));
     }
 
-    auto border_width_value = style().property("border-width");
-    auto border_color_value = style().property("border-color");
-    auto border_style_value = style().property("border-style");
+    // FIXME: Respect all individual border sides
+    auto border_width_value = style().property(CSS::PropertyID::BorderTopWidth);
+    auto border_color_value = style().property(CSS::PropertyID::BorderTopColor);
+    auto border_style_value = style().property(CSS::PropertyID::BorderTopStyle);
     if (border_width_value.has_value() && border_color_value.has_value()) {
         int border_width = border_width_value.value()->to_length().to_px();
         Color border_color = border_color_value.value()->to_color(document());
diff --git a/Libraries/LibHTML/Layout/LayoutText.cpp b/Libraries/LibHTML/Layout/LayoutText.cpp
index a75b7f11e2..581760d11c 100644
--- a/Libraries/LibHTML/Layout/LayoutText.cpp
+++ b/Libraries/LibHTML/Layout/LayoutText.cpp
@@ -30,7 +30,7 @@ const String& LayoutText::text_for_style(const StyleProperties& style) const
 {
     static String one_space = " ";
     if (is_all_whitespace(node().data())) {
-        if (style.string_or_fallback("white-space", "normal") == "normal")
+        if (style.string_or_fallback(CSS::PropertyID::WhiteSpace, "normal") == "normal")
             return one_space;
     }
     return node().data();
@@ -41,8 +41,8 @@ void LayoutText::render_fragment(RenderingContext& context, const LineBoxFragmen
     auto& painter = context.painter();
     painter.set_font(style().font());
 
-    auto color = style().color_or_fallback("color", document(), Color::Black);
-    auto text_decoration = style().string_or_fallback("text-decoration", "none");
+    auto color = style().color_or_fallback(CSS::PropertyID::Color, document(), Color::Black);
+    auto text_decoration = style().string_or_fallback(CSS::PropertyID::TextDecoration, "none");
 
     bool is_underline = text_decoration == "underline";
     if (is_underline)
@@ -131,7 +131,7 @@ void LayoutText::split_into_lines(LayoutBlock& container)
         line_boxes.append(LineBox());
     int available_width = container.rect().width() - line_boxes.last().width();
 
-    bool is_preformatted = style().string_or_fallback("white-space", "normal") == "pre";
+    bool is_preformatted = style().string_or_fallback(CSS::PropertyID::WhiteSpace, "normal") == "pre";
     if (is_preformatted) {
         for_each_source_line([&](const Utf8View& view, int start, int length) {
             line_boxes.last().add_fragment(*this, start, length, font.width(view), line_height);
diff --git a/Libraries/LibHTML/Parser/CSSParser.cpp b/Libraries/LibHTML/Parser/CSSParser.cpp
index 7b43b046ac..4166177b78 100644
--- a/Libraries/LibHTML/Parser/CSSParser.cpp
+++ b/Libraries/LibHTML/Parser/CSSParser.cpp
@@ -1,13 +1,14 @@
+#include <AK/HashMap.h>
 #include <LibHTML/CSS/StyleSheet.h>
 #include <LibHTML/Parser/CSSParser.h>
 #include <ctype.h>
 #include <stdio.h>
 
-#define PARSE_ASSERT(x) \
-    if (!(x)) { \
-        dbg() << "CSS PARSER ASSERTION FAILED: " << #x; \
+#define PARSE_ASSERT(x)                                                   \
+    if (!(x)) {                                                           \
+        dbg() << "CSS PARSER ASSERTION FAILED: " << #x;                   \
         dbg() << "At character# " << index << " in CSS: _" << css << "_"; \
-        ASSERT_NOT_REACHED(); \
+        ASSERT_NOT_REACHED();                                             \
     }
 
 static Optional<Color> parse_css_color(const StringView& view)
@@ -47,6 +48,55 @@ NonnullRefPtr<StyleValue> parse_css_value(const StringView& view)
     return StringStyleValue::create(string);
 }
 
+static CSS::PropertyID parse_css_property_id(const StringView& string)
+{
+    static HashMap<String, CSS::PropertyID> map;
+    if (map.is_empty()) {
+        map.set("background-color", CSS::PropertyID::BackgroundColor);
+        map.set("border-bottom-style", CSS::PropertyID::BorderBottomStyle);
+        map.set("border-bottom-width", CSS::PropertyID::BorderBottomWidth);
+        map.set("border-collapse", CSS::PropertyID::BorderCollapse);
+        map.set("border-left-style", CSS::PropertyID::BorderLeftStyle);
+        map.set("border-left-width", CSS::PropertyID::BorderLeftWidth);
+        map.set("border-right-style", CSS::PropertyID::BorderRightStyle);
+        map.set("border-right-width", CSS::PropertyID::BorderRightWidth);
+        map.set("border-spacing", CSS::PropertyID::BorderSpacing);
+        map.set("border-top-style", CSS::PropertyID::BorderTopStyle);
+        map.set("border-top-width", CSS::PropertyID::BorderTopWidth);
+        map.set("color", CSS::PropertyID::Color);
+        map.set("display", CSS::PropertyID::Display);
+        map.set("font-family", CSS::PropertyID::FontFamily);
+        map.set("font-size", CSS::PropertyID::FontSize);
+        map.set("font-style", CSS::PropertyID::FontStyle);
+        map.set("font-variant", CSS::PropertyID::FontVariant);
+        map.set("font-weight", CSS::PropertyID::FontWeight);
+        map.set("height", CSS::PropertyID::Height);
+        map.set("letter-spacing", CSS::PropertyID::LetterSpacing);
+        map.set("line-height", CSS::PropertyID::LineHeight);
+        map.set("list-style", CSS::PropertyID::ListStyle);
+        map.set("list-style-image", CSS::PropertyID::ListStyleImage);
+        map.set("list-style-position", CSS::PropertyID::ListStylePosition);
+        map.set("list-style-type", CSS::PropertyID::ListStyleType);
+        map.set("margin-bottom", CSS::PropertyID::MarginBottom);
+        map.set("margin-left", CSS::PropertyID::MarginLeft);
+        map.set("margin-right", CSS::PropertyID::MarginRight);
+        map.set("margin-top", CSS::PropertyID::MarginTop);
+        map.set("padding-bottom", CSS::PropertyID::PaddingBottom);
+        map.set("padding-left", CSS::PropertyID::PaddingLeft);
+        map.set("padding-right", CSS::PropertyID::PaddingRight);
+        map.set("padding-top", CSS::PropertyID::PaddingTop);
+        map.set("text-align", CSS::PropertyID::TextAlign);
+        map.set("text-decoration", CSS::PropertyID::TextDecoration);
+        map.set("text-indent", CSS::PropertyID::TextIndent);
+        map.set("text-transform", CSS::PropertyID::TextTransform);
+        map.set("visibility", CSS::PropertyID::Visibility);
+        map.set("white-space", CSS::PropertyID::WhiteSpace);
+        map.set("width", CSS::PropertyID::Width);
+        map.set("word-spacing", CSS::PropertyID::WordSpacing);
+    }
+    return map.get(string).value_or(CSS::PropertyID::Invalid);
+}
+
 class CSSParser {
 public:
     CSSParser(const StringView& input)
@@ -233,7 +283,7 @@ public:
         if (peek() != '}')
             consume_specific(';');
 
-        return StyleProperty { property_name, parse_css_value(property_value), is_important };
+        return StyleProperty { parse_css_property_id(property_name), parse_css_value(property_value), is_important };
     }
 
     void parse_declaration()