Throw DOMException when invoked Document::execCommand on non-{X,}HTML documents

Source/core/dom/Document.idl

 /*
  * Copyright (C) 2006, 2007, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006, 2007 Samuel Weinig <sam@webkit.org>
  *
  * 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,
@@ skipping 98 matching lines @@
 
     // dynamic markup insertion
     // FIXME: open(), close(), write() and writeln() are on HTMLDocument.
 
     // user interaction
     [ImplementedAs=domWindow] readonly attribute Window? defaultView;
     readonly attribute Element? activeElement;
     boolean hasFocus();
     // FIXME: designMode should not have [TreatNullAs=NullString].
     [TreatNullAs=NullString, CustomElementCallbacks, MeasureAs=DocumentDesignMode] attribute DOMString designMode;
-    [CustomElementCallbacks] boolean execCommand(DOMString commandId, optional boolean showUI = false, optional DOMString value = "");
-    boolean queryCommandEnabled(DOMString commandId);
-    boolean queryCommandIndeterm(DOMString commandId);
-    boolean queryCommandState(DOMString commandId);
-    boolean queryCommandSupported(DOMString commandId);
-    DOMString queryCommandValue(DOMString commandId);
+    [CustomElementCallbacks, RaisesException] boolean execCommand(DOMString commandId, optional boolean showUI = false, optional DOMString value = "");
+    [RaisesException] boolean queryCommandEnabled(DOMString commandId);
+    [RaisesException] boolean queryCommandIndeterm(DOMString commandId);
+    [RaisesException] boolean queryCommandState(DOMString commandId);
+    [RaisesException] boolean queryCommandSupported(DOMString commandId);
+    [RaisesException] DOMString queryCommandValue(DOMString commandId);
 
     [LenientThis] attribute EventHandler onreadystatechange;
 
     // HTML obsolete features
     // https://html.spec.whatwg.org/#Document-partial
 
     // FIXME: *Color are on HTMLDocument.
 
     readonly attribute HTMLCollection anchors;
     readonly attribute HTMLCollection applets;
@@ skipping 83 matching lines @@
     attribute EventHandler onsearch;
     [RuntimeEnabled=ExperimentalContentSecurityPolicyFeatures] attribute EventHandler onsecuritypolicyviolation;
     attribute EventHandler onselectionchange;
     attribute EventHandler onselectstart;
     attribute EventHandler onwheel;
 };
 
 Document implements GlobalEventHandlers;
 Document implements ParentNode;
 Document implements NonElementParentNode;