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diff --git a/dom/base/nsDOMCaretPosition.h b/dom/base/nsDOMCaretPosition.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=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 nsDOMCaretPosition_h
+#define nsDOMCaretPosition_h
+
+#include "nsCycleCollectionParticipant.h"
+#include "nsCOMPtr.h"
+#include "nsINode.h"
+#include "nsWrapperCache.h"
+
+namespace mozilla {
+namespace dom {
+class DOMRect;
+} // namespace dom
+} // namespace mozilla
+
+/**
+ * Implementation of a DOM Caret Position, which is a node and offset within
+ * that node, in the DOM tree.
+ *
+ * http://www.w3.org/TR/cssom-view/#dom-documentview-caretrangefrompoint
+ *
+ * @see Document::caretPositionFromPoint(float x, float y)
+ */
+class nsDOMCaretPosition : public nsISupports,
+ public nsWrapperCache
+{
+ typedef mozilla::dom::DOMRect DOMRect;
+
+public:
+ NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+ NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsDOMCaretPosition)
+
+ nsDOMCaretPosition(nsINode* aNode, uint32_t aOffset);
+
+ /**
+ * Retrieve the offset (character position within the DOM node) of the
+ * CaretPosition.
+ *
+ * @returns The offset within the DOM node.
+ */
+ uint32_t Offset() const { return mOffset; }
+
+ /**
+ * Retrieve the DOM node with which this CaretPosition was established.
+ * Normally, this will be created from a point, so it will be the DOM
+ * node that lies at the point specified.
+ *
+ * @returns The DOM node of the CaretPosition.
+ *
+ * @see Document::caretPositionFromPoint(float x, float y)
+ */
+ nsINode* GetOffsetNode() const;
+
+ /**
+ * Retrieve the bounding rectangle of this CaretPosition object.
+ *
+ * @returns An nsClientRect representing the bounding rectangle of this
+ * CaretPosition, if one can be successfully determined, otherwise
+ * nullptr.
+ */
+ already_AddRefed<DOMRect> GetClientRect() const;
+
+ /**
+ * Set the anonymous content node that is the actual parent of this
+ * CaretPosition object. In situations where the DOM node for a CaretPosition
+ * actually lies within an anonymous content node (e.g. a textarea), the
+ * actual parent is not set as the offset node. This is used to get the
+ * correct bounding box of a CaretPosition object that lies within a textarea
+ * or input element.
+ *
+ * @param aNode A pointer to an nsINode object that is the actual element
+ * within which this CaretPosition lies, but is an anonymous content
+ * node.
+ */
+ void SetAnonymousContentNode(nsINode* aNode)
+ {
+ mAnonymousContentNode = aNode;
+ }
+
+ nsISupports* GetParentObject() const
+ {
+ return GetOffsetNode();
+ }
+
+ virtual JSObject* WrapObject(JSContext *aCx, JS::Handle<JSObject*> aGivenProto)
+ override final;
+
+protected:
+ virtual ~nsDOMCaretPosition();
+
+ uint32_t mOffset;
+ nsCOMPtr<nsINode> mOffsetNode;
+ nsCOMPtr<nsINode> mAnonymousContentNode;
+};
+#endif
+