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They went behind CloudFlare because of DDoS attacks. That is why you are seeing captchas. https://twitter.com/placeholdit/status/256201151266045952

I really don't understand most people. Why would you ever DDoS a CSS library's website?

Accidental DDoS? For fun (a la 4chan etc.) etc. But yeah I understand what you mean.

If it's accidental, is it really a DDoS? Or a poorly deployed/coded app? :)