Revert “Prevent Preflight from affecting list semantics”

[benface]

Unfortunately, I realized after my previous PR (#13815) got merged that there is one case where there is a visual difference between list-style: none and list-style: "", which is when the <li> is empty. With list-style: "", it still takes up space, as you can see in this CodePen: https://codepen.io/benface/pen/MWdRdyY. I guess we'll have to keep using role="list" when we want to keep the list semantics.

[thecrypticace]

Just thinking out loud but we could target those explicitly like this (would need to tweak the selector for specificity reasons tho):

:is(ol, ul, menu) li:empty { list-style-type: none; }

[benface]

Haha, yeah, I suppose... but what about <li> </li>? I guess that :empty is supposed to match elements with only whitespace, but no browser supports it yet.

[adamwathan]

Sad but thanks for catching 😄