I use whm/cpanel at origin server. They have made TLS 1.2 as default (no tls 1.0 and tls 1.1 enabled by default). At Cloudflare we use TLS 1.0 at Cloudflare.
Now if a user come from IE 10(which has TLS 1.2 disabled by default) and access .html file which is not cached at Cloudflare. Will user get that .html file or not?
If you’re already using Cloudflare, this should already work. If Cloudflare is already working for your site, then you’re all set. My server doesn’t support TLS 1.3, but that’s what I use in my browsers and I can reach my sites.