Why does Firefox treat Helvetica differently from Chrome? was marked as a duplicate of CSS font differences between browsers. There was no clear explanation, save for this comment:
“IMO, the answer applies equally well here: ‘But as hard as you try, you won't get the 100% same look. This is because of the different font rendering strategies browsers and OS use.’”
I updated my question with an appeal (see “UPDATE 2”) but the users who marked it as a duplicate aren’t as quick to respond as they were to close the question.
Can someone at least explain what community rules apply here to clarify the situation?