--- a/master/types.html	Thu Dec 20 17:27:25 2012 +1100
+++ b/master/types.html	Fri Dec 21 15:33:20 2012 +1100
@@ -1517,8 +1517,8 @@
   attribute DOMString <a href="types.html#__svg__SVGElement__xmllang">xmllang</a>;
   attribute DOMString <a href="types.html#__svg__SVGElement__xmlspace">xmlspace</a>;
 
-  readonly attribute <a class="idlinterface" href="struct.html#InterfaceSVGSVGElement">SVGSVGElement</a> <a href="types.html#__svg__SVGElement__ownerSVGElement">ownerSVGElement</a>;
-  readonly attribute <a class="idlinterface" href="types.html#InterfaceSVGElement">SVGElement</a> <a href="types.html#__svg__SVGElement__viewportElement">viewportElement</a>;
+  readonly attribute <a class="idlinterface" href="struct.html#InterfaceSVGSVGElement">SVGSVGElement</a>? <a href="types.html#__svg__SVGElement__ownerSVGElement">ownerSVGElement</a>;
+  readonly attribute <a class="idlinterface" href="types.html#InterfaceSVGElement">SVGElement</a>? <a href="types.html#__svg__SVGElement__viewportElement">viewportElement</a>;
 };</pre>
 
 <dl class="interface">