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diff --git a/Userland/Libraries/LibWeb/CSS/Selector.h b/Userland/Libraries/LibWeb/CSS/Selector.h
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+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/FlyString.h>
+#include <AK/Vector.h>
+
+namespace Web::CSS {
+
+class Selector {
+public:
+    struct SimpleSelector {
+        enum class Type {
+            Invalid,
+            Universal,
+            TagName,
+            Id,
+            Class,
+        };
+        Type type { Type::Invalid };
+
+        enum class PseudoClass {
+            None,
+            Link,
+            Visited,
+            Hover,
+            Focus,
+            FirstChild,
+            LastChild,
+            OnlyChild,
+            Empty,
+            Root,
+        };
+        PseudoClass pseudo_class { PseudoClass::None };
+
+        enum class PseudoElement {
+            None,
+            Before,
+            After,
+        };
+        PseudoElement pseudo_element { PseudoElement::None };
+
+        FlyString value;
+
+        enum class AttributeMatchType {
+            None,
+            HasAttribute,
+            ExactValueMatch,
+            Contains,
+        };
+
+        AttributeMatchType attribute_match_type { AttributeMatchType::None };
+        FlyString attribute_name;
+        String attribute_value;
+    };
+
+    struct ComplexSelector {
+        enum class Relation {
+            None,
+            ImmediateChild,
+            Descendant,
+            AdjacentSibling,
+            GeneralSibling,
+        };
+        Relation relation { Relation::None };
+
+        using CompoundSelector = Vector<SimpleSelector>;
+        CompoundSelector compound_selector;
+    };
+
+    explicit Selector(Vector<ComplexSelector>&&);
+    ~Selector();
+
+    const Vector<ComplexSelector>& complex_selectors() const { return m_complex_selectors; }
+
+    u32 specificity() const;
+
+private:
+    Vector<ComplexSelector> m_complex_selectors;
+};
+
+}