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diff --git a/accessible/html/HTMLSelectAccessible.h b/accessible/html/HTMLSelectAccessible.h
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_a11y_HTMLSelectAccessible_h__
+#define mozilla_a11y_HTMLSelectAccessible_h__
+
+#include "HTMLFormControlAccessible.h"
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ *  Selects, Listboxes and Comboboxes, are made up of a number of different
+ *  widgets, some of which are shared between the two. This file contains
+ *  all of the widgets for both of the Selects, for HTML only.
+ *
+ *  Listbox:
+ *     - HTMLSelectListAccessible
+ *        - HTMLSelectOptionAccessible
+ *
+ *  Comboboxes:
+ *     - HTMLComboboxAccessible
+ *        - HTMLComboboxListAccessible  [ inserted in accessible tree ]
+ *           - HTMLSelectOptionAccessible(s)
+ */
+
+/*
+ * The list that contains all the options in the select.
+ */
+class HTMLSelectListAccessible : public AccessibleWrap {
+ public:
+  HTMLSelectListAccessible(nsIContent* aContent, DocAccessible* aDoc);
+  virtual ~HTMLSelectListAccessible() {}
+
+  // Accessible
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+  virtual bool IsAcceptableChild(nsIContent* aEl) const override;
+
+  // SelectAccessible
+  virtual bool SelectAll() override;
+  virtual bool UnselectAll() override;
+
+  // Widgets
+  virtual bool IsWidget() const override;
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+  virtual Accessible* CurrentItem() const override;
+  virtual void SetCurrentItem(const Accessible* aItem) override;
+};
+
+/*
+ * Options inside the select, contained within the list
+ */
+class HTMLSelectOptionAccessible : public HyperTextAccessibleWrap {
+ public:
+  enum { eAction_Select = 0 };
+
+  HTMLSelectOptionAccessible(nsIContent* aContent, DocAccessible* aDoc);
+  virtual ~HTMLSelectOptionAccessible() {}
+
+  // Accessible
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+  virtual uint64_t NativeInteractiveState() const override;
+
+  virtual int32_t GetLevelInternal() override;
+  virtual nsRect RelativeBounds(nsIFrame** aBoundingFrame) const override;
+  virtual void SetSelected(bool aSelect) override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() const override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) const override;
+
+  // Widgets
+  virtual Accessible* ContainerWidget() const override;
+
+ protected:
+  // Accessible
+  virtual ENameValueFlag NativeName(nsString& aName) const override;
+
+ private:
+  /**
+   * Return a select accessible the option belongs to if any.
+   */
+  Accessible* GetSelect() const {
+    Accessible* parent = mParent;
+    if (parent && parent->IsHTMLOptGroup()) parent = parent->Parent();
+
+    if (parent && parent->IsListControl()) {
+      Accessible* combobox = parent->Parent();
+      return combobox && combobox->IsCombobox() ? combobox : mParent;
+    }
+
+    return nullptr;
+  }
+
+  /**
+   * Return a combobox accessible the option belongs to if any.
+   */
+  Accessible* GetCombobox() const {
+    Accessible* parent = mParent;
+    if (parent && parent->IsHTMLOptGroup()) parent = parent->Parent();
+
+    if (parent && parent->IsListControl()) {
+      Accessible* combobox = parent->Parent();
+      return combobox && combobox->IsCombobox() ? combobox : nullptr;
+    }
+
+    return nullptr;
+  }
+};
+
+/*
+ * Opt Groups inside the select, contained within the list
+ */
+class HTMLSelectOptGroupAccessible : public HTMLSelectOptionAccessible {
+ public:
+  HTMLSelectOptGroupAccessible(nsIContent* aContent, DocAccessible* aDoc)
+      : HTMLSelectOptionAccessible(aContent, aDoc) {
+    mType = eHTMLOptGroupType;
+  }
+  virtual ~HTMLSelectOptGroupAccessible() {}
+
+  // Accessible
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeInteractiveState() const override;
+  virtual bool IsAcceptableChild(nsIContent* aEl) const override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() const override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) const override;
+};
+
+/** ------------------------------------------------------ */
+/**  Finally, the Combobox widgets                         */
+/** ------------------------------------------------------ */
+
+class HTMLComboboxListAccessible;
+
+/*
+ * A class the represents the HTML Combobox widget.
+ */
+class HTMLComboboxAccessible final : public AccessibleWrap {
+ public:
+  enum { eAction_Click = 0 };
+
+  HTMLComboboxAccessible(nsIContent* aContent, DocAccessible* aDoc);
+  virtual ~HTMLComboboxAccessible() {}
+
+  // Accessible
+  virtual void Shutdown() override;
+  virtual void Description(nsString& aDescription) override;
+  virtual void Value(nsString& aValue) const override;
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+  virtual bool RemoveChild(Accessible* aChild) override;
+  virtual bool IsAcceptableChild(nsIContent* aEl) const override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() const override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) const override;
+
+  // Widgets
+  virtual bool IsWidget() const override;
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+  virtual Accessible* CurrentItem() const override;
+  virtual void SetCurrentItem(const Accessible* aItem) override;
+
+ protected:
+  /**
+   * Return selected option.
+   */
+  Accessible* SelectedOption() const;
+
+ private:
+  RefPtr<HTMLComboboxListAccessible> mListAccessible;
+};
+
+/*
+ * A class that represents the window that lives to the right
+ * of the drop down button inside the Select. This is the window
+ * that is made visible when the button is pressed.
+ */
+class HTMLComboboxListAccessible : public HTMLSelectListAccessible {
+ public:
+  HTMLComboboxListAccessible(Accessible* aParent, nsIContent* aContent,
+                             DocAccessible* aDoc);
+  virtual ~HTMLComboboxListAccessible() {}
+
+  // Accessible
+  virtual nsIFrame* GetFrame() const override;
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+  virtual nsRect RelativeBounds(nsIFrame** aBoundingFrame) const override;
+  virtual bool IsAcceptableChild(nsIContent* aEl) const override;
+
+  // Widgets
+  virtual bool IsActiveWidget() const override;
+  virtual bool AreItemsOperable() const override;
+};
+
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif