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diff --git a/dom/webidl/TreeView.webidl b/dom/webidl/TreeView.webidl
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+++ b/dom/webidl/TreeView.webidl
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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/. */
+
+interface nsITreeSelection;
+
+interface mixin TreeView
+{
+  /**
+   * The total number of rows in the tree (including the offscreen rows).
+   */
+  readonly attribute long rowCount;
+
+  /**
+   * The selection for this view.
+   */
+  [SetterThrows]
+  attribute nsITreeSelection? selection;
+
+  /**
+   * A whitespace delimited list of properties.  For each property X the view
+   * gives back will cause the pseudoclasses  ::-moz-tree-cell(x),
+   * ::-moz-tree-row(x), ::-moz-tree-twisty(x), ::-moz-tree-image(x),
+   * ::-moz-tree-cell-text(x).  to be matched on the pseudoelement
+   * ::moz-tree-row.
+   */
+  [Throws]
+  DOMString getRowProperties(long row);
+
+  /**
+   * A whitespace delimited list of properties for a given cell.  Each
+   * property, x, that the view gives back will cause the pseudoclasses
+   *  ::-moz-tree-cell(x), ::-moz-tree-row(x), ::-moz-tree-twisty(x),
+   *  ::-moz-tree-image(x), ::-moz-tree-cell-text(x). to be matched on the
+   *  cell.
+   */
+  [Throws]
+  DOMString getCellProperties(long row, TreeColumn column);
+
+  /**
+   * Called to get properties to paint a column background.  For shading the sort
+   * column, etc.
+   */
+  DOMString getColumnProperties(TreeColumn column);
+
+  /**
+   * Methods that can be used to test whether or not a twisty should be drawn,
+   * and if so, whether an open or closed twisty should be used.
+   */
+  [Throws]
+  boolean isContainer(long row);
+  [Throws]
+  boolean isContainerOpen(long row);
+  [Throws]
+  boolean isContainerEmpty(long row);
+
+  /**
+   * isSeparator is used to determine if the row is a separator.
+   * A value of true will result in the tree drawing a horizontal separator.
+   * The tree uses the ::moz-tree-separator pseudoclass to draw the separator.
+   */
+  [Throws]
+  boolean isSeparator(long row);
+
+  /**
+   * Specifies if there is currently a sort on any column. Used mostly by dragdrop
+   * to affect drop feedback.
+   */
+  boolean isSorted();
+
+  const short DROP_BEFORE = -1;
+  const short DROP_ON = 0;
+  const short DROP_AFTER = 1;
+  /**
+   * Methods used by the drag feedback code to determine if a drag is allowable at
+   * the current location. To get the behavior where drops are only allowed on
+   * items, such as the mailNews folder pane, always return false when
+   * the orientation is not DROP_ON.
+   */
+  [Throws]
+  boolean canDrop(long row, long orientation, DataTransfer? dataTransfer);
+
+  /**
+   * Called when the user drops something on this view. The |orientation| param
+   * specifies before/on/after the given |row|.
+   */
+  [Throws]
+  void drop(long row, long orientation, DataTransfer? dataTransfer);
+
+  /**
+   * Methods used by the tree to draw thread lines in the tree.
+   * getParentIndex is used to obtain the index of a parent row.
+   * If there is no parent row, getParentIndex returns -1.
+   */
+  [Throws]
+  long getParentIndex(long row);
+
+  /**
+   * hasNextSibling is used to determine if the row at rowIndex has a nextSibling
+   * that occurs *after* the index specified by afterIndex.  Code that is forced
+   * to march down the view looking at levels can optimize the march by starting
+   * at afterIndex+1.
+   */
+  [Throws]
+  boolean hasNextSibling(long row, long afterIndex);
+
+  /**
+   * The level is an integer value that represents
+   * the level of indentation.  It is multiplied by the width specified in the
+   * :moz-tree-indentation pseudoelement to compute the exact indendation.
+   */
+  [Throws]
+  long getLevel(long row);
+
+  /**
+   * The image path for a given cell. For defining an icon for a cell.
+   * If the empty string is returned, the :moz-tree-image pseudoelement
+   * will be used.
+   */
+  [Throws]
+  DOMString getImageSrc(long row, TreeColumn column);
+
+  /**
+   * The value for a given cell. This method is only called for columns
+   * of type other than |text|.
+   */
+  [Throws]
+  DOMString getCellValue(long row, TreeColumn column);
+
+  /**
+   * The text for a given cell.  If a column consists only of an image, then
+   * the empty string is returned.
+   */
+  [Throws]
+  DOMString getCellText(long row, TreeColumn column);
+
+  /**
+   * Called during initialization to link the view to the front end box object.
+   */
+  [Throws]
+  void setTree(XULTreeElement? tree);
+
+  /**
+   * Called on the view when an item is opened or closed.
+   */
+  [Throws]
+  void toggleOpenState(long row);
+
+  /**
+   * Called on the view when a header is clicked.
+   */
+  [Throws]
+  void cycleHeader(TreeColumn column);
+
+  /**
+   * Should be called from a XUL onselect handler whenever the selection changes.
+   */
+  void selectionChanged();
+
+  /**
+   * Called on the view when a cell in a non-selectable cycling column (e.g., unread/flag/etc.) is clicked.
+   */
+  void cycleCell(long row, TreeColumn column);
+
+  /**
+   * isEditable is called to ask the view if the cell contents are editable.
+   * A value of true will result in the tree popping up a text field when
+   * the user tries to inline edit the cell.
+   */
+  [Throws]
+  boolean isEditable(long row, TreeColumn column);
+
+  /**
+   * setCellValue is called when the value of the cell has been set by the user.
+   * This method is only called for columns of type other than |text|.
+   */
+  [Throws]
+  void setCellValue(long row, TreeColumn column, DOMString value);
+
+  /**
+   * setCellText is called when the contents of the cell have been edited by the user.
+   */
+  [Throws]
+  void setCellText(long row, TreeColumn column, DOMString value);
+};