you cant create subdomain zones with just business plan, and creating a second zone as partial for the same domain doesnt work because a domain can only be on one zone at once regardless of type you need enterprise to create the subdomain zone for this
When you use a subdomain setup, you can manage the Cloudflare configurations for one or more subdomains separately from those associated with your apex domain. This means that, on your account homepage, you would find websites like example.com or blog.example.com listed as separate zones.
if all is well and total tls is working as designed, no but if a total tls cert fails to issue, fails to renew or otherwise goes missing / isnt ready yet, universal is used as a backup
if you want to guarentee the CA is always the same, issue a manual advanced cert for example.com and *.example.com, disable universal and use the manually issued one as the fallback instead
Look, you can use whatever browser you want. But arguing or continuing to discuss it at length here isn't productive and it would be great if we could move on from that
That's great but it's not on-topic for this channel nor relevant to the server, lets get back to discussing Cloudflare (and NOT how it relates to old browsers, that has been discussed to death already), thanks