https://github.com/w3c/csswg-drafts/issues/4206
Resolution is to add ::marker { text-transform: none; } to UA stylesheet
<rdar://problem/65941363>
Created attachment 407431 [details] Patch
Created attachment 407442 [details] Patch
Created attachment 407448 [details] Patch
Committed r266288: <https://trac.webkit.org/changeset/266288> All reviewed patches have been landed. Closing bug and clearing flags on attachment 407448 [details].