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The CSS validator can't validate my website over HTTPS, while plain HTTP works. My best guess is that it tries to do IDNA but gets it wrong. The error message is "I/O Error: handshake alert: unrecognized_name". The URI I'm trying to use is: http://jigsaw.w3.org/css-validator/validator?uri=https://www.xn--rombobjrn-67a.se/