Sync HTML element interfaces O-Q with the spec

Source/core/html/HTMLOptionElement.idl

 /*
  * Copyright (C) 2006, 2007, 2010 Apple, Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
+// https://html.spec.whatwg.org/#htmloptionelement
+
+// TODO(philipj): The constructor arguments default values are not per spec.
 [
     NamedConstructor=Option(optional DOMString data = null,
                             optional DOMString value = null,
                             [Default=Undefined] optional boolean defaultSelected,
                             [Default=Undefined] optional boolean selected),
     ConstructorCallWith=Document,
     RaisesException=Constructor
 ] interface HTMLOptionElement : HTMLElement {
     [Reflect] attribute boolean disabled;
-    readonly attribute HTMLFormElement form;
+    readonly attribute HTMLFormElement? form;
     attribute DOMString label;
     [Reflect=selected] attribute boolean defaultSelected;
     attribute boolean selected;
     attribute DOMString value;
 
+    // TODO(philipj): The text setter should never throw.
     [RaisesException=Setter] attribute DOMString text;
     readonly attribute long index;
 };