Screenshot: https://d.pr/i/gvj3fA
I've been trying to visit web.dev for days for various reasons, but I just get this and neither Chrome nor Safari will let me visit. But apparently a bunch of you can see the page, so I'm confused as to why I seem to be the only one seeing this... but maybe you or someone there can help? Thanks.
Perhaps you have a proxy causing interference?
As the sibling comment notes, looking at the certificate using Advanced may help clarify things.
Update: here's the full chain that I see:
web.dev, signed by GTS CA 1D2, with a root certificate of GlobalSign Root CA - R2.
As far as I know, I have no proxies to interfere...
If you can open your terminal, this may be easier:
% openssl s_client -connect web.dev:443
It will hang (I guess awaiting more commands) but you can use Control-C to kill the connection.
The gist below has the first several lines showing what you should see.
https://gist.github.com/macintux/68ab1317d4b7677951069baf95c...
Glad you got it sorted, happy to help.