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diff --git a/Source/WebCore/rendering/SelectionSubtreeRoot.h b/Source/WebCore/rendering/SelectionSubtreeRoot.h
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+++ b/Source/WebCore/rendering/SelectionSubtreeRoot.h
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+ /*
+ * Copyright (C) 2014 Igalia S.L.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above
+ *    copyright notice, this list of conditions and the following
+ *    disclaimer.
+ * 2. Redistributions in binary form must reproduce the above
+ *    copyright notice, this list of conditions and the following
+ *    disclaimer in the documentation and/or other materials
+ *    provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+ * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "RenderObject.h"
+#include "RenderSelectionInfo.h"
+
+namespace WebCore {
+
+class Document;
+
+class SelectionSubtreeRoot {
+public:
+    
+    typedef HashMap<RenderObject*, std::unique_ptr<RenderSelectionInfo>> SelectedObjectMap;
+    typedef HashMap<const RenderBlock*, std::unique_ptr<RenderBlockSelectionInfo>> SelectedBlockMap;
+
+    struct OldSelectionData {
+        OldSelectionData()
+        {
+        }
+
+        std::optional<unsigned> selectionStartPos;
+        std::optional<unsigned> selectionEndPos;
+        SelectedObjectMap selectedObjects;
+        SelectedBlockMap selectedBlocks;
+    };
+
+    class SelectionSubtreeData {
+    public:
+        SelectionSubtreeData() = default;
+
+        SelectionSubtreeData(RenderObject* selectionStart, std::optional<unsigned> selectionStartPos, RenderObject* selectionEnd, std::optional<unsigned> selectionEndPos)
+            : m_selectionStart(selectionStart)
+            , m_selectionStartPos(selectionStartPos)
+            , m_selectionEnd(selectionEnd)
+            , m_selectionEndPos(selectionEndPos)
+        {
+        }
+
+        RenderObject* selectionStart() const { return m_selectionStart; }
+        std::optional<unsigned> selectionStartPos() const { return m_selectionStartPos; }
+        RenderObject* selectionEnd() const { return m_selectionEnd; }
+        std::optional<unsigned> selectionEndPos() const { return m_selectionEndPos; }
+        bool selectionClear() const
+        {
+            return !m_selectionStart
+            && (!m_selectionStartPos)
+            && !m_selectionEnd
+            && (!m_selectionEndPos);
+        }
+
+        void selectionStartEndPositions(unsigned& startPos, unsigned& endPos) const
+        {
+            startPos = m_selectionStartPos.value();
+            endPos = m_selectionEndPos.value();
+        }
+        void setSelectionStart(RenderObject* selectionStart) { m_selectionStart = selectionStart; }
+        void setSelectionStartPos(std::optional<unsigned> selectionStartPos) { m_selectionStartPos = selectionStartPos;}
+        void setSelectionEnd(RenderObject* selectionEnd) { m_selectionEnd = selectionEnd; }
+        void setSelectionEndPos(std::optional<unsigned> selectionEndPos) { m_selectionEndPos = selectionEndPos;}
+        void clearSelection()
+        {
+            m_selectionStart = nullptr;
+            m_selectionStartPos = std::nullopt;
+            m_selectionEnd = nullptr;
+            m_selectionEndPos = std::nullopt;
+        }
+
+    private:
+        RenderObject* m_selectionStart { nullptr };
+        std::optional<unsigned> m_selectionStartPos;
+        RenderObject* m_selectionEnd { nullptr };
+        std::optional<unsigned> m_selectionEndPos;
+    };
+
+    typedef HashMap<SelectionSubtreeRoot*, SelectionSubtreeData> RenderSubtreesMap;
+    typedef HashMap<const SelectionSubtreeRoot*, std::unique_ptr<OldSelectionData>> SubtreeOldSelectionDataMap;
+
+    SelectionSubtreeRoot();
+
+    SelectionSubtreeData& selectionData() { return m_selectionSubtreeData; }
+    const SelectionSubtreeData& selectionData() const { return m_selectionSubtreeData; }
+
+    void setSelectionData(const SelectionSubtreeData& selectionSubtreeData) { m_selectionSubtreeData = selectionSubtreeData; }
+    void adjustForVisibleSelection(Document&);
+
+private:
+    SelectionSubtreeData m_selectionSubtreeData;
+};
+
+} // namespace WebCore