+* HTML *+ 要素と属性 https://so-zou.jp/web-app/tech/html/specification/element-attribute.htm idとclassとの違い https://www.sejuku.net/blog/85629 +* CSS *+ IDを指定 https://www.tagindex.com/stylesheet/basic/format3.html CSSの無効化 https://magazine.techacademy.jp/magazine/38815 +* JavaScript *+ タグを追加 https://www.javadrive.jp/javascript/before/index2.html タグに属性を追加 https://kasumiblog.org/javascript-setattribute/ +*
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