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diff --git a/dom/webidl/Element.webidl b/dom/webidl/Element.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://dom.spec.whatwg.org/#element and
+ * http://domparsing.spec.whatwg.org/ and
+ * http://dev.w3.org/csswg/cssom-view/ and
+ * http://www.w3.org/TR/selectors-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface Element : Node {
+  [Constant]
+  readonly attribute DOMString? namespaceURI;
+  [Constant]
+  readonly attribute DOMString? prefix;
+  [Constant]
+  readonly attribute DOMString localName;
+
+  // Not [Constant] because it depends on which document we're in
+  [Pure]
+  readonly attribute DOMString tagName;
+
+  [Pure]
+           attribute DOMString id;
+  [Pure]
+           attribute DOMString className;
+  [Constant, PutForwards=value]
+  readonly attribute DOMTokenList classList;
+
+  [SameObject]
+  readonly attribute NamedNodeMap attributes;
+  [Pure]
+  sequence<DOMString> getAttributeNames();
+  [Pure]
+  DOMString? getAttribute(DOMString name);
+  [Pure]
+  DOMString? getAttributeNS(DOMString? namespace, DOMString localName);
+  [Throws]
+  void setAttribute(DOMString name, DOMString value);
+  [Throws]
+  void setAttributeNS(DOMString? namespace, DOMString name, DOMString value);
+  [Throws]
+  void removeAttribute(DOMString name);
+  [Throws]
+  void removeAttributeNS(DOMString? namespace, DOMString localName);
+  [Pure]
+  boolean hasAttribute(DOMString name);
+  [Pure]
+  boolean hasAttributeNS(DOMString? namespace, DOMString localName);
+  [Pure]
+  boolean hasAttributes();
+
+  [Throws, Pure]
+  Element? closest(DOMString selector);
+
+  [Throws, Pure]
+  boolean matches(DOMString selector);
+  [Throws, Pure, BinaryName="matches"]
+  boolean webkitMatchesSelector(DOMString selector);
+
+  [Pure]
+  HTMLCollection getElementsByTagName(DOMString localName);
+  [Throws, Pure]
+  HTMLCollection getElementsByTagNameNS(DOMString? namespace, DOMString localName);
+  [Pure]
+  HTMLCollection getElementsByClassName(DOMString classNames);
+
+  [Throws, Pure]
+  Element? insertAdjacentElement(DOMString where, Element element); // historical
+
+  [Throws]
+  void insertAdjacentText(DOMString where, DOMString data); // historical
+
+  /**
+   * The ratio of font-size-inflated text font size to computed font
+   * size for this element. This will query the element for its primary frame,
+   * and then use this to get font size inflation information about the frame.
+   * This will be 1.0 if font size inflation is not enabled, and -1.0 if an
+   * error occurred during the retrieval of the font size inflation.
+   *
+   * @note The font size inflation ratio that is returned is actually the
+   *       font size inflation data for the element's _primary frame_, not the
+   *       element itself, but for most purposes, this should be sufficient.
+   */
+  [ChromeOnly]
+  readonly attribute float fontSizeInflation;
+
+  // Mozilla specific stuff
+  [Pure]
+           attribute EventHandler onwheel;
+
+  // Selectors API
+  /**
+   * Returns whether this element would be selected by the given selector
+   * string.
+   *
+   * See <http://dev.w3.org/2006/webapi/selectors-api2/#matchesselector>
+   */
+  [Throws, Pure, BinaryName="matches"]
+  boolean mozMatchesSelector(DOMString selector);
+
+  // Pointer events methods.
+  [Throws, Pref="dom.w3c_pointer_events.enabled", UnsafeInPrerendering]
+  void setPointerCapture(long pointerId);
+
+  [Throws, Pref="dom.w3c_pointer_events.enabled"]
+  void releasePointerCapture(long pointerId);
+
+  [Pref="dom.w3c_pointer_events.enabled"]
+  boolean hasPointerCapture(long pointerId);
+
+  // Proprietary extensions
+  /**
+   * Set this during a mousedown event to grab and retarget all mouse events
+   * to this element until the mouse button is released or releaseCapture is
+   * called. If retargetToElement is true, then all events are targetted at
+   * this element. If false, events can also fire at descendants of this
+   * element.
+   * 
+   */
+  void setCapture(optional boolean retargetToElement = false);
+
+  /**
+   * If this element has captured the mouse, release the capture. If another
+   * element has captured the mouse, this method has no effect.
+   */
+  void releaseCapture();
+
+  // Mozilla extensions
+
+  // Obsolete methods.
+  Attr? getAttributeNode(DOMString name);
+  [Throws]
+  Attr? setAttributeNode(Attr newAttr);
+  [Throws]
+  Attr? removeAttributeNode(Attr oldAttr);
+  Attr? getAttributeNodeNS(DOMString? namespaceURI, DOMString localName);
+  [Throws]
+  Attr? setAttributeNodeNS(Attr newAttr);
+
+  [ChromeOnly]
+  /**
+   * Scrolls the element by (dx, dy) CSS pixels without doing any
+   * layout flushing.
+   */
+  boolean scrollByNoFlush(long dx, long dy);
+
+  // Support reporting of Grid properties
+
+  /**
+   * If this element has a display:grid or display:inline-grid style,
+   * this property returns an object with computed values for grid
+   * tracks and lines.
+   */
+  [ChromeOnly, Pure]
+  sequence<Grid> getGridFragments();
+};
+
+// http://dev.w3.org/csswg/cssom-view/
+enum ScrollLogicalPosition { "start", "end" };
+dictionary ScrollIntoViewOptions : ScrollOptions {
+  ScrollLogicalPosition block = "start";
+};
+
+// http://dev.w3.org/csswg/cssom-view/#extensions-to-the-element-interface
+partial interface Element {
+  DOMRectList getClientRects();
+  DOMRect getBoundingClientRect();
+
+  // scrolling
+  void scrollIntoView(boolean top);
+  void scrollIntoView(optional ScrollIntoViewOptions options);
+  // None of the CSSOM attributes are [Pure], because they flush
+           attribute long scrollTop;   // scroll on setting
+           attribute long scrollLeft;  // scroll on setting
+  readonly attribute long scrollWidth;
+  readonly attribute long scrollHeight;
+  
+  void scroll(unrestricted double x, unrestricted double y);
+  void scroll(optional ScrollToOptions options);
+  void scrollTo(unrestricted double x, unrestricted double y);
+  void scrollTo(optional ScrollToOptions options);
+  void scrollBy(unrestricted double x, unrestricted double y);
+  void scrollBy(optional ScrollToOptions options);
+  // mozScrollSnap is used by chrome to perform scroll snapping after the
+  // user performs actions that may affect scroll position
+  // mozScrollSnap is deprecated, to be replaced by a web accessible API, such
+  // as an extension to the ScrollOptions dictionary.  See bug 1137937.
+  [ChromeOnly] void mozScrollSnap();
+
+  readonly attribute long clientTop;
+  readonly attribute long clientLeft;
+  readonly attribute long clientWidth;
+  readonly attribute long clientHeight;
+
+  // Mozilla specific stuff
+  /* The minimum/maximum offset that the element can be scrolled to
+     (i.e., the value that scrollLeft/scrollTop would be clamped to if they were
+     set to arbitrarily large values. */
+  [ChromeOnly] readonly attribute long scrollTopMin;
+               readonly attribute long scrollTopMax;
+  [ChromeOnly] readonly attribute long scrollLeftMin;
+               readonly attribute long scrollLeftMax;
+};
+
+// http://domparsing.spec.whatwg.org/#extensions-to-the-element-interface
+partial interface Element {
+  [Pure,SetterThrows,TreatNullAs=EmptyString]
+  attribute DOMString innerHTML;
+  [Pure,SetterThrows,TreatNullAs=EmptyString]
+  attribute DOMString outerHTML;
+  [Throws]
+  void insertAdjacentHTML(DOMString position, DOMString text);
+};
+
+// http://www.w3.org/TR/selectors-api/#interface-definitions
+partial interface Element {
+  [Throws, Pure]
+  Element?  querySelector(DOMString selectors);
+  [Throws, Pure]
+  NodeList  querySelectorAll(DOMString selectors);
+};
+
+// http://w3c.github.io/webcomponents/spec/shadow/#extensions-to-element-interface
+partial interface Element {
+  [Throws,Func="nsDocument::IsWebComponentsEnabled"]
+  ShadowRoot createShadowRoot();
+  [Func="nsDocument::IsWebComponentsEnabled"]
+  NodeList getDestinationInsertionPoints();
+  [Func="nsDocument::IsWebComponentsEnabled"]
+  readonly attribute ShadowRoot? shadowRoot;
+};
+
+Element implements ChildNode;
+Element implements NonDocumentTypeChildNode;
+Element implements ParentNode;
+Element implements Animatable;
+Element implements GeometryUtils;
+
+// https://fullscreen.spec.whatwg.org/#api
+partial interface Element {
+  [Throws, UnsafeInPrerendering, Func="nsDocument::IsUnprefixedFullscreenEnabled"]
+  void requestFullscreen();
+  [Throws, UnsafeInPrerendering, BinaryName="requestFullscreen"]
+  void mozRequestFullScreen();
+};
+
+// https://w3c.github.io/pointerlock/#extensions-to-the-element-interface
+partial interface Element {
+  [UnsafeInPrerendering]
+  void requestPointerLock();
+  [UnsafeInPrerendering, BinaryName="requestPointerLock", Pref="pointer-lock-api.prefixed.enabled"]
+  void mozRequestPointerLock();
+};