I have been using JS widgets instead of datetime-local inputs because of patchy desktop browser support years back. In FF on Mac I noticed time widget with pref

I have been using JS widgets instead of datetime-local inputs because of patchy desktop browser support years back. In FF on Mac I noticed time widget with prefilled times in datalist doesn't work as intended. Should we still rely on the widgets if there are browser kinks? I also feel multivalued tag inputs also require JS widgets. Is there a pure HTML version?