We should be able to apply styles or hide/show all of the numbers in the Quiz.
Is there a reason the numbers are in spans instead of a <ol> tag? It would be a fairly simply matter to just do .myclass .ol or .myclass .li and apply styles to the list in the enclosed quiz. (If you do that to span, then it would change a lot of different things)
Alternatively we can add the class to the <span> i.e. <span class = 'enumeration'> I guess.
Doing this in <ol> would also fix T170798, but I wonder if the original author had a reason for doing it this way.