[openssl-users] s_server -www -tls1_3: Firefox/Chrome not working

[Salz, Rich]

>    My point was about the likelihood of last-draft browsers lingering
    on in the real world for some time (like 1 to 3 years) after the
    TLS1.3-final browser versions ship.

I do not think this is a concern.  Chrome and FF auto-update and get almost full coverage within a month or two, for example.  Edge hasn't shipped TLS 1.3 yet. Safari encourages auto-update.  That's most of the browser market.