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diff --git a/accessible/html/HTMLElementAccessibles.h b/accessible/html/HTMLElementAccessibles.h
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+/* -*- Mode: C++; tab-width: 2; 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_HTMLElementAccessibles_h__
+#define mozilla_a11y_HTMLElementAccessibles_h__
+
+#include "BaseAccessibles.h"
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * Used for HTML hr element.
+ */
+class HTMLHRAccessible : public LeafAccessible {
+ public:
+  HTMLHRAccessible(nsIContent* aContent, DocAccessible* aDoc)
+      : LeafAccessible(aContent, aDoc) {}
+
+  // Accessible
+  virtual a11y::role NativeRole() const override;
+};
+
+/**
+ * Used for HTML br element.
+ */
+class HTMLBRAccessible : public LeafAccessible {
+ public:
+  HTMLBRAccessible(nsIContent* aContent, DocAccessible* aDoc)
+      : LeafAccessible(aContent, aDoc) {
+    mType = eHTMLBRType;
+    mGenericTypes |= eText;
+  }
+
+  // Accessible
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+
+ protected:
+  // Accessible
+  virtual ENameValueFlag NativeName(nsString& aName) const override;
+};
+
+/**
+ * Used for HTML label element.
+ */
+class HTMLLabelAccessible : public HyperTextAccessibleWrap {
+ public:
+  HTMLLabelAccessible(nsIContent* aContent, DocAccessible* aDoc)
+      : HyperTextAccessibleWrap(aContent, aDoc) {}
+
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(HTMLLabelAccessible,
+                                       HyperTextAccessibleWrap)
+
+  // Accessible
+  virtual Relation RelationByType(RelationType aType) 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;
+
+ protected:
+  virtual ~HTMLLabelAccessible() {}
+  virtual ENameValueFlag NativeName(nsString& aName) const override;
+};
+
+/**
+ * Used for HTML output element.
+ */
+class HTMLOutputAccessible : public HyperTextAccessibleWrap {
+ public:
+  HTMLOutputAccessible(nsIContent* aContent, DocAccessible* aDoc)
+      : HyperTextAccessibleWrap(aContent, aDoc) {}
+
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(HTMLOutputAccessible,
+                                       HyperTextAccessibleWrap)
+
+  // Accessible
+  virtual Relation RelationByType(RelationType aType) const override;
+
+ protected:
+  virtual ~HTMLOutputAccessible() {}
+};
+
+/**
+ * Accessible for the HTML summary element.
+ */
+class HTMLSummaryAccessible : public HyperTextAccessibleWrap {
+ public:
+  enum { eAction_Click = 0 };
+
+  HTMLSummaryAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // Check that the given Accessible belongs to a details frame.
+  // If so, find and return the accessible for the detail frame's
+  // main summary.
+  static HTMLSummaryAccessible* FromDetails(Accessible* aDetails);
+
+  // Accessible
+  virtual uint64_t NativeState() 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;
+};
+
+/**
+ * Used for HTML header and footer elements.
+ */
+class HTMLHeaderOrFooterAccessible : public HyperTextAccessibleWrap {
+ public:
+  HTMLHeaderOrFooterAccessible(nsIContent* aContent, DocAccessible* aDoc)
+      : HyperTextAccessibleWrap(aContent, aDoc) {}
+
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(HTMLHeaderOrFooterAccessible,
+                                       HyperTextAccessibleWrap)
+
+  // Accessible
+  virtual nsAtom* LandmarkRole() const override;
+  virtual a11y::role NativeRole() const override;
+
+ protected:
+  virtual ~HTMLHeaderOrFooterAccessible() {}
+};
+
+/**
+ * Used for HTML section element.
+ */
+class HTMLSectionAccessible : public HyperTextAccessibleWrap {
+ public:
+  HTMLSectionAccessible(nsIContent* aContent, DocAccessible* aDoc)
+      : HyperTextAccessibleWrap(aContent, aDoc) {}
+
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(HTMLSectionAccessible,
+                                       HyperTextAccessibleWrap)
+
+  // Accessible
+  virtual nsAtom* LandmarkRole() const override;
+  virtual a11y::role NativeRole() const override;
+
+ protected:
+  virtual ~HTMLSectionAccessible() = default;
+};
+
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif