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The experimental HTML5 validator... http://html5.validator.nu/?doc=http%3A%2F%2Fdev.w3.org%2Fcsswg%2Fcss3-flexbox%2F&submit=Check ...indicates that the flexbox ED has several duplicate IDs. The IDs that are used multiple times in the document are: "display-flex" "display-inline-flex" "main" "algo-cross-item"
Appears to be fixed (fantasai again, I reckon?).
Yup, fantasai fixed this in https://dvcs.w3.org/hg/csswg/rev/b6ad5b5ab087