W3C offers a secure, authenticated connection for all W3C resources
We are pleased to announce that we upgraded today our servers to support both HTTP and HTTPS access to public resources. W3C advocates that the Web platform "actively prefer secure communication." Thanks to recent work in the Web Application Security Working Group and supporting client implementations, and the deployment work of the W3C Systems Team, we are now able to provide HTTPS access to all W3C resources. All W3C documents, including Recommendations, DTDs, and vocabularies will be available with the authentication, integrity-protection, and confidentiality HTTPS supports.
Read about what the change involves, the challenges and some side-effects in the detailed post on the W3C Blog.