This task is done when we've written and agreed on the technical migration plan.
Use cases to consider:
* Visual editing a page with mixed refs, some in the document, some rendered by a template. Also template-generated reflists.
* Sites which have customized the CSS which applies to Parsoid-rendered refs and reflists, in both VE and reader mode.
* Sites with `$wgTranslateNumerals` on and off.
* Sites which have customized footnote marker and backlink labels.
* Pages in multiple content languages, ie. using Page Translation.
* Interface language different than content language.
* Pages with subreferences (beta cluster only)
== Migration plan (draft) ==
* [x] Improve Parsoid explicit fallback numbering until it matches legacy parser output, {T369614}
* Ask communities to remov* [ ] Remove Cite CSS styling, carefully limited to only the CSS counters and reflist styling once we're sure that it matches the explicit fallback numbers.
* Stop emitting CSS counters[ ] Ask communities to remove CSS styling, carefully limited to only the CSS counters and reflist styling.
* [ ] Stop emitting CSS `counter-reset` in Parsoid.