HTML Living Standardのtfoot要素周りに変更が入りました、と。https://t.co/YHM3wopQTO Disallow <tfoot> before <tbody> in the content model In HTML4, `tfoot` had to appear before `tbody`, but HTML5 a...— HTML Standard (@htmlstandard) 2015, 12月 16 まじかー</tbody></tfoot>…