What are the legacy Chrome, Firefox, Safari versions Tailwind V3.4 supports?

[Ozaiy]

We have to support legacy browsers as well and i want to know how far back Tailwind V3.4 can go.
Can it support browsers fro m 2016 for example?
I could not find this in the docs or discussions that is why i am asking here.

[sueun-dev]

Short answer: no, v3.4 won't run on 2016-era browsers.

I compiled tailwindcss@3.4.19 and read the output. A few preflight (base reset) rules use the :where() pseudo-class, e.g. abbr:where([title]) and [hidden]:where(:not([hidden=until-found])). Those particular rules silently no-op on engines that don't know :where() (Safari 14 / Firefox 78 / Chrome+Edge 88, so ~2020-2021); the rest of preflight still applies.

That's not the only floor though: color utilities emit rgb(59 130 246 / 0.5) slash-alpha syntax, which needs ~2018 browsers (Chrome 66, Safari 12.1), so dropping preflight won't get you to 2016 either.

Docs agree: v3 is "designed for and tested on the latest stable versions of Chrome, Firefox, Edge, and Safari" and drops IE11. To target 2016 you'd be hand-checking each feature on caniuse.