今さら感がハンパないのと、ちょっと前の話になってしまいますが、hgroup 要素が HTML5 の勧告候補 (Candidate Recommendation) から削除されるようです。 WG Decision on request to drop hgroup from HTML5 : W3C Mailing lists plan on removing hgroup from spec : W3C Mailing lists as per the chairs decision I plan to remove hgroup from the HTML5 spec. It will be made non conforming, but the implemented parsing rules and user agent CSS rules will remain (as is u