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diff --git a/dom/webidl/DataTransfer.webidl b/dom/webidl/DataTransfer.webidl
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+/* -*- Mode: IDL; 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/.
+ *
+ * The origin of this IDL file is:
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-datatransfer-interface
+ */
+interface ContentSecurityPolicy;
+
+[Exposed=Window]
+interface DataTransfer {
+  constructor();
+
+           attribute DOMString dropEffect;
+           attribute DOMString effectAllowed;
+
+  readonly attribute DataTransferItemList items;
+
+  undefined setDragImage(Element image, long x, long y);
+
+  // ReturnValueNeedsContainsHack on .types because lots of extension
+  // code was expecting .contains() back when it was a DOMStringList.
+  [Pure, Cached, Frozen, NeedsCallerType, ReturnValueNeedsContainsHack]
+  readonly attribute sequence<DOMString> types;
+  [Throws, NeedsSubjectPrincipal]
+  DOMString getData(DOMString format);
+  [Throws, NeedsSubjectPrincipal]
+  undefined setData(DOMString format, DOMString data);
+  [Throws, NeedsSubjectPrincipal]
+  undefined clearData(optional DOMString format);
+  [NeedsSubjectPrincipal]
+  readonly attribute FileList? files;
+};
+
+// Mozilla specific stuff
+partial interface DataTransfer {
+  /*
+   * Set the drag source. Usually you would not change this, but it will
+   * affect which node the drag and dragend events are fired at. The
+   * default target is the node that was dragged.
+   *
+   * @param element drag source to use
+   * @throws NO_MODIFICATION_ALLOWED_ERR if the item cannot be modified
+   */
+  [Throws, UseCounter]
+  undefined addElement(Element element);
+
+  /**
+   * The number of items being dragged.
+   */
+  [ChromeOnly]
+  readonly attribute unsigned long mozItemCount;
+
+  /**
+   * Sets the drag cursor state. Primarily used to control the cursor during
+   * tab drags, but could be expanded to other uses. XXX Currently implemented
+   * on Win32 only.
+   *
+   * Possible values:
+   *  auto - use default system behavior.
+   *  default - set the cursor to an arrow during the drag operation.
+   *
+   * Values other than 'default' are indentical to setting mozCursor to
+   * 'auto'.
+   */
+  [UseCounter]
+  attribute DOMString mozCursor;
+
+  /**
+   * Holds a list of the format types of the data that is stored for an item
+   * at the specified index. If the index is not in the range from 0 to
+   * itemCount - 1, an empty string list is returned.
+   */
+  [Throws, ChromeOnly]
+  DOMStringList mozTypesAt(unsigned long index);
+
+  /**
+   * Remove the data associated with the given format for an item at the
+   * specified index. The index is in the range from zero to itemCount - 1.
+   *
+   * If the last format for the item is removed, the entire item is removed,
+   * reducing the itemCount by one.
+   *
+   * If format is empty, then the data associated with all formats is removed.
+   * If the format is not found, then this method has no effect.
+   *
+   * @param format the format to remove
+   * @throws NS_ERROR_DOM_INDEX_SIZE_ERR if index is greater or equal than itemCount
+   * @throws NO_MODIFICATION_ALLOWED_ERR if the item cannot be modified
+   */
+  [Throws, ChromeOnly]
+  undefined mozClearDataAt(DOMString format, unsigned long index);
+
+  /*
+   * A data transfer may store multiple items, each at a given zero-based
+   * index. setDataAt may only be called with an index argument less than
+   * itemCount in which case an existing item is modified, or equal to
+   * itemCount in which case a new item is added, and the itemCount is
+   * incremented by one.
+   *
+   * Data should be added in order of preference, with the most specific
+   * format added first and the least specific format added last. If data of
+   * the given format already exists, it is replaced in the same position as
+   * the old data.
+   *
+   * The data should be either a string, a primitive boolean or number type
+   * (which will be converted into a string) or an nsISupports.
+   *
+   * @param format the format to add
+   * @param data the data to add
+   * @throws NS_ERROR_NULL_POINTER if the data is null
+   * @throws NS_ERROR_DOM_INDEX_SIZE_ERR if index is greater than itemCount
+   * @throws NO_MODIFICATION_ALLOWED_ERR if the item cannot be modified
+   */
+  [Throws, ChromeOnly]
+  undefined mozSetDataAt(DOMString format, any data, unsigned long index);
+
+  /**
+   * Retrieve the data associated with the given format for an item at the
+   * specified index, or null if it does not exist. The index should be in the
+   * range from zero to itemCount - 1.
+   *
+   * @param format the format of the data to look up
+   * @returns the data of the given format, or null if it doesn't exist.
+   * @throws NS_ERROR_DOM_INDEX_SIZE_ERR if index is greater or equal than itemCount
+   */
+  [Throws, ChromeOnly]
+  any mozGetDataAt(DOMString format, unsigned long index);
+
+  /**
+   * Update the drag image. Arguments are the same as setDragImage. This is only
+   * valid within the parent chrome process.
+   */
+  [ChromeOnly]
+  undefined updateDragImage(Element image, long x, long y);
+
+  /**
+   * Will be true when the user has cancelled the drag (typically by pressing
+   * Escape) and when the drag has been cancelled unexpectedly.  This will be
+   * false otherwise, including when the drop has been rejected by its target.
+   * This property is only relevant for the dragend event.
+   */
+  [UseCounter]
+  readonly attribute boolean mozUserCancelled;
+
+  /**
+   * The node that the mouse was pressed over to begin the drag. For external
+   * drags, or if the caller cannot access this node, this will be null.
+   */
+  [UseCounter]
+  readonly attribute Node? mozSourceNode;
+
+  /**
+   * The top-level window context that mouse was pressed over to begin the drag.
+   * For external drags, this will be null.
+   */
+  [ChromeOnly]
+  readonly attribute WindowContext? sourceTopWindowContext;
+
+  /**
+   * The URI spec of the triggering principal.  This may be different than
+   * sourceNode's principal when sourceNode is xul:browser and the drag is
+   * triggered in a browsing context inside it.
+   */
+  [ChromeOnly]
+  readonly attribute DOMString mozTriggeringPrincipalURISpec;
+
+  [ChromeOnly]
+  readonly attribute ContentSecurityPolicy? mozCSP;
+
+  /**
+   * Copy the given DataTransfer for the given event. Used by testing code for
+   * creating emulated Drag and Drop events in the UI.
+   *
+   * NOTE: Don't expose a DataTransfer produced with this method to the web or
+   * use this for non-testing purposes. It can easily be used to get the
+   * DataTransfer into an invalid state, and is an unstable implementation
+   * detail of EventUtils.synthesizeDrag.
+   */
+  [Throws, ChromeOnly]
+  DataTransfer mozCloneForEvent(DOMString event);
+
+  /**
+   * Whether to show the "fail" animation that returns a dragged item
+   * to its source. Only works on macOS, and has to be set early in the drag
+   * on that platform.
+   * Defaults to true.
+   */
+  [ChromeOnly]
+  attribute boolean mozShowFailAnimation;
+};