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You can, but then you get automated emails from Github Support telling you that your DNS config is wrong and that you should be using CNAMEs rather than A records (since Cloudflare flattens the virtual CNAMEs to As if you do a DNS lookup).

What domain? I'll get an issue filed to stop sending warning emails in cases like this. Thanks!

It's studio.zerobrane.com (pointing to pkulchenko.github.io/ZeroBraneStudio); thanks for looking into it!

If you have a subdomain, there's no need to use Cloudflare - if you CNAME this domain to pkulchenko.github.io you'll use GitHub's CDN automatically.

Oh wow. I’ll update the article now, thanks!

Edit: Done, seeing changes will need an F5.

I don't believe that it is valid per RFC 1034 to set the root domain record to be a CNAME.

I found this out when I asked this question a while back: http://serverfault.com/questions/55528/set-root-domain-recor...

You should try reading his link.