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http://www.w3.org/TR/html51/interactive-elements.html#normal-alignment "L4 and L4" Should read L3 and L4.
HTML5.1 Bugzilla Bug Triage: Fixed L3 to L4 https://github.com/w3c/html/pull/252 If this resolution is not satisfactory, please copy the relevant bug details/proposal into a new issue at the W3C HTML5 Issue tracker: https://github.com/w3c/html/issues/new where it will be re-triaged. Thanks!
Thanks Erik! https://github.com/whatwg/html/pull/1965