Does "no role may be applied" mean "UAs MUST NOT apply a role even if an author supplies one and gets the element rendered"?

[cookiecrook]

In the SVG-AAM Mapping Table, does "no role may be applied" mean something like"UAs MUST NOT apply a role even if an author supplies one and gets the element rendered"?

In most cases, it won't matter, because these elements aren't usually rendered. Bug if an author gets one of these special elements rendered… and gives it a valid role... Is that still just an author error, or MUST the UA specifically not expose the author-supplied role?