コメントでの指摘を受け、新しく記事を起こしました: HTML5 での引用と引用元のマークアップ HTML5 の 2010 年 3 月 4 日付 W3C 草案 で、footer 要素は以下のように定義されています: The footer element represents a footer for its nearest ancestor sectioning content or sectioning root element. A footer typically contains information about its section such as who wrote it, links to related documents, copyright data, and the like. (4.4.9 The footer element — HTML 5) 「footer
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