@TAdeleye_WMF my suggestion would be:
if the css class client-js is present, we enable drag and drop for STV and if it is not present, or client-nojs is set, the previous interface with the dropdowns is used. I would not use any other alternative such as multiselect, as the order can also play a role here, so I would leave it as it is.

@jsn.sherman from what I was told, it should allow getting html and wikitext result, because the current state is that getTextResult returns also an html string but should be wikitext. If I run the tally.php it will be wikitext and if I add --html i will get html string and this should be everything for this task. That's what I know about it