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diff --git a/Userland/Libraries/LibWeb/HTML/Navigable.h b/Userland/Libraries/LibWeb/HTML/Navigable.h
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index 0000000000..e96fe5db0d
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+++ b/Userland/Libraries/LibWeb/HTML/Navigable.h
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+/*
+ * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibJS/Heap/Cell.h>
+#include <LibWeb/Forward.h>
+
+namespace Web::HTML {
+
+// https://html.spec.whatwg.org/multipage/document-sequences.html#navigable
+class Navigable : public JS::Cell {
+    JS_CELL(Navigable, JS::Cell);
+
+public:
+    virtual ~Navigable() override;
+
+    String const& id() const { return m_id; };
+    JS::GCPtr<Navigable> parent() const { return m_parent; };
+
+    bool is_closing() const { return m_closing; };
+    void set_closing(bool value) { m_closing = value; };
+
+    bool is_delaying_load_events() const { return m_delaying_load_events; };
+    void set_delaying_load_events(bool value) { m_delaying_load_events = value; };
+
+    JS::GCPtr<SessionHistoryEntry> active_session_history_entry() const { return m_active_session_history_entry; };
+    JS::GCPtr<SessionHistoryEntry> current_session_history_entry() const { return m_current_session_history_entry; };
+
+    JS::GCPtr<DOM::Document> active_document();
+    JS::GCPtr<BrowsingContext> active_browsing_context();
+    JS::GCPtr<WindowProxy> active_window_proxy();
+    JS::GCPtr<Window> active_window();
+
+    String target_name() const;
+
+    JS::GCPtr<NavigableContainer> container() const;
+    void set_container(JS::GCPtr<NavigableContainer>);
+
+protected:
+    Navigable();
+
+    virtual void visit_edges(Cell::Visitor&) override;
+
+private:
+    // https://html.spec.whatwg.org/multipage/document-sequences.html#nav-id
+    String m_id;
+
+    // https://html.spec.whatwg.org/multipage/document-sequences.html#nav-parent
+    JS::GCPtr<Navigable> m_parent;
+
+    // https://html.spec.whatwg.org/multipage/document-sequences.html#nav-current-history-entry
+    JS::GCPtr<SessionHistoryEntry> m_current_session_history_entry;
+
+    // https://html.spec.whatwg.org/multipage/document-sequences.html#nav-active-history-entry
+    JS::GCPtr<SessionHistoryEntry> m_active_session_history_entry;
+
+    // https://html.spec.whatwg.org/multipage/document-sequences.html#is-closing
+    bool m_closing { false };
+
+    // https://html.spec.whatwg.org/multipage/document-sequences.html#delaying-load-events-mode
+    bool m_delaying_load_events { false };
+
+    // Implied link between navigable and its container.
+    JS::GCPtr<NavigableContainer> m_container;
+};
+
+}