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diff --git a/accessible/html/HTMLTableAccessible.h b/accessible/html/HTMLTableAccessible.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_HTMLTableAccessible_h__
+#define mozilla_a11y_HTMLTableAccessible_h__
+
+#include "HyperTextAccessible.h"
+
+class nsITableCellLayout;
+class nsTableCellFrame;
+class nsTableWrapperFrame;
+
+namespace mozilla {
+
+namespace a11y {
+
+class HTMLTableAccessible;
+
+/**
+ * HTML table cell accessible (html:td).
+ */
+class HTMLTableCellAccessible : public HyperTextAccessible {
+ public:
+  HTMLTableCellAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // nsISupports
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(HTMLTableCellAccessible,
+                                       HyperTextAccessible)
+
+  // LocalAccessible
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+  virtual uint64_t NativeInteractiveState() const override;
+  virtual already_AddRefed<AccAttributes> NativeAttributes() override;
+
+ protected:
+  virtual void DOMAttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
+                                   int32_t aModType,
+                                   const nsAttrValue* aOldValue,
+                                   uint64_t aOldState) override;
+  // HTMLTableCellAccessible
+ public:
+  HTMLTableAccessible* Table() const;
+  uint32_t ColExtent() const;
+  uint32_t RowExtent() const;
+
+  static HTMLTableCellAccessible* GetFrom(LocalAccessible* aAcc) {
+    if (aAcc->IsHTMLTableCell()) {
+      return static_cast<HTMLTableCellAccessible*>(aAcc);
+    }
+    return nullptr;
+  }
+
+ protected:
+  virtual ~HTMLTableCellAccessible() {}
+};
+
+/**
+ * HTML table row/column header accessible (html:th or html:td@scope).
+ */
+class HTMLTableHeaderCellAccessible : public HTMLTableCellAccessible {
+ public:
+  HTMLTableHeaderCellAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // LocalAccessible
+  virtual a11y::role NativeRole() const override;
+};
+
+/**
+ * HTML table row accessible (html:tr).
+ */
+class HTMLTableRowAccessible : public HyperTextAccessible {
+ public:
+  HTMLTableRowAccessible(nsIContent* aContent, DocAccessible* aDoc)
+      : HyperTextAccessible(aContent, aDoc) {
+    mType = eHTMLTableRowType;
+    mGenericTypes |= eTableRow;
+  }
+
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(HTMLTableRowAccessible,
+                                       HyperTextAccessible)
+
+ protected:
+  virtual ~HTMLTableRowAccessible() {}
+
+  // LocalAccessible
+  virtual ENameValueFlag NativeName(nsString& aName) const override;
+};
+
+/**
+ * HTML table accessible (html:table).
+ */
+
+// To turn on table debugging descriptions define SHOW_LAYOUT_HEURISTIC
+// This allow release trunk builds to be used by testers to refine the
+// data vs. layout heuristic
+// #define SHOW_LAYOUT_HEURISTIC
+
+class HTMLTableAccessible : public HyperTextAccessible {
+ public:
+  HTMLTableAccessible(nsIContent* aContent, DocAccessible* aDoc)
+      : HyperTextAccessible(aContent, aDoc) {
+    mType = eHTMLTableType;
+    mGenericTypes |= eTable;
+  }
+
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(HTMLTableAccessible, HyperTextAccessible)
+
+  // HTMLTableAccessible
+  LocalAccessible* Caption() const;
+  uint32_t ColCount() const;
+  uint32_t RowCount();
+  bool IsProbablyLayoutTable();
+
+  static HTMLTableAccessible* GetFrom(LocalAccessible* aAcc) {
+    if (aAcc->IsHTMLTable()) {
+      return static_cast<HTMLTableAccessible*>(aAcc);
+    }
+    return nullptr;
+  }
+
+  // LocalAccessible
+  virtual void Description(nsString& aDescription) const override;
+  virtual uint64_t NativeState() const override;
+  virtual already_AddRefed<AccAttributes> NativeAttributes() override;
+  virtual Relation RelationByType(RelationType aRelationType) const override;
+
+  virtual bool InsertChildAt(uint32_t aIndex, LocalAccessible* aChild) override;
+
+ protected:
+  virtual ~HTMLTableAccessible() {}
+
+  // LocalAccessible
+  virtual ENameValueFlag NativeName(nsString& aName) const override;
+
+  virtual void DOMAttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
+                                   int32_t aModType,
+                                   const nsAttrValue* aOldValue,
+                                   uint64_t aOldState) override;
+
+  // HTMLTableAccessible
+
+#ifdef SHOW_LAYOUT_HEURISTIC
+  nsString mLayoutHeuristic;
+#endif
+
+ private:
+  /**
+   * Get table wrapper frame, or return null if there is no inner table.
+   */
+  nsTableWrapperFrame* GetTableWrapperFrame() const;
+};
+
+/**
+ * HTML caption accessible (html:caption).
+ */
+class HTMLCaptionAccessible : public HyperTextAccessible {
+ public:
+  HTMLCaptionAccessible(nsIContent* aContent, DocAccessible* aDoc)
+      : HyperTextAccessible(aContent, aDoc) {
+    mType = eHTMLCaptionType;
+  }
+
+  // LocalAccessible
+  virtual a11y::role NativeRole() const override;
+  virtual Relation RelationByType(RelationType aRelationType) const override;
+
+ protected:
+  virtual ~HTMLCaptionAccessible() {}
+};
+
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif