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diff --git a/accessible/base/ARIAStateMap.h b/accessible/base/ARIAStateMap.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* 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_aria_ARIAStateMap_h_
+#define _mozilla_a11y_aria_ARIAStateMap_h_
+
+#include <stdint.h>
+
+namespace mozilla {
+
+namespace dom {
+class Element;
+}
+
+namespace a11y {
+namespace aria {
+
+/**
+ * List of the ARIA state mapping rules.
+ */
+enum EStateRule {
+  eARIANone,
+  eARIAAutoComplete,
+  eARIABusy,
+  eARIACheckableBool,
+  eARIACheckableMixed,
+  eARIACheckedMixed,
+  eARIACurrent,
+  eARIADisabled,
+  eARIAExpanded,
+  eARIAHasPopup,
+  eARIAInvalid,
+  eARIAModal,
+  eARIAMultiline,
+  eARIAMultiSelectable,
+  eARIAOrientation,
+  eARIAPressed,
+  eARIAReadonly,
+  eARIAReadonlyOrEditable,
+  eARIARequired,
+  eARIASelectable,
+  eARIASelectableIfDefined,
+  eReadonlyUntilEditable,
+  eIndeterminateIfNoValue,
+  eFocusableUntilDisabled
+};
+
+/**
+ * Expose the accessible states for the given element accordingly to state
+ * mapping rule.
+ *
+ * @param  aRule     [in] state mapping rule ID
+ * @param  aElement  [in] node of the accessible
+ * @param  aState    [in/out] accessible states
+ * @return            true if state map rule ID is valid
+ */
+bool MapToState(EStateRule aRule, dom::Element* aElement, uint64_t* aState);
+
+}  // namespace aria
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif