How can I get the 'width' and 'height' of an

Hi,

I use the following code to get and print the width and height
attribute of a nsIDOMNSHTMLElement.

But I only get 'empty' string.   I am sure that the source has 'width'
and 'height' attribute.  Can you please tell me what am i missing?

Thank you.


    nsIDOMNSHTMLElement* element;

   nsCOMPtr<nsIDOMElement> domElement = do_QueryInterface(element);

    if (domElement) {
      nsAutoString width;
      nsAutoString height;

      domElement->GetAttribute(NS_LITERAL_STRING("width"), width) ;
      domElement->GetAttribute(NS_LITERAL_STRING("height"), height) ;

      printf("w:%s:\n", width.get());
      printf("h:%s:\n", height.get());

}