Re: [css-lists][html] <summary> and ::marker

 > "display:list-item" then just makes the ::marker pay attention to the
 > list-style-* properties.

Isn't that where the complexity in this approach lies?

The other problem with this approach is that it requires checking for 
::marker rules on all elements, which is not cheap.  It's bad enough to 
have to do this for ::before and ::after; I don't think we want to add 
more things like this.

-Boris