Re: ACTION-61: text for embedding part of the Window object

> <code>Window.frameElement</code> from a child document MUST reflect the  
> referencing element or <code>null</code> if there is no such element.  
> <code>Window.parent</code> MUST reflect the parent document Window 
> object  or <code>null</code> if there is no such document. 
> <code>Window.top</code>  MUST reflect the root document Window object. 
> Using  <code>Window.top</code> within the root document makes no 
> difference.  Implementations MAY throw for any of these attributes for 
> security  reasons. Some language specific bindings allow these DOM 
> attributes, even  though readonly, to be set to different values. In 
> such cases UAs reflect  the values set by the script author.
> 
> ISSUE: Because implementations MAY throw the MUST should probably be  
> SHOULD...

I'm not sure that it's a good idea to define the exact security policy 
here. Shouldn't we allow implementations to return null rather then 
throwing?

/ Jonas