[must support the class attribute on all elements with CORE attribute set:
object] (class, id), 
printers SHALL also support the style attribute [on all elements with CORE
attribute set ,  
Printers MUST support the cid [RFC2392] and http [RFC2616] schemes of a URI
[RFC2396] (http), 
[must support the data attribute of the object element],
[must support the height attribute of the object element],
[must support the type="image/jpeg" attribute of the object element], 
[must support the width attribute of the object element],
A printer MUST support resources of type "image/jpeg." 
23: A conforming printer MUST NOT treat [an] attribute [marked as should]
as an error. (style)
25: A conforming printer MUST NOT treat [an] attribute [marked as N/A] as 
an error: title