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

Source/core/dom/Document.idl

Index: Source/core/dom/Document.idl
diff --git a/Source/core/dom/Document.idl b/Source/core/dom/Document.idl
index c20312780c74e41777d3c1e7b421290b91503cf0..5ebbf1193b4b5b5263b07f1695ad3d83ce30db84 100644
--- a/Source/core/dom/Document.idl
+++ b/Source/core/dom/Document.idl
@@ -116,12 +116,12 @@ interface Document : Node {
     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;