disclosure widget
折り畳みウィジェット、エクスパンダ
Code folding
Progressive disclosure
https://source.unsplash.com/featured/?disclosure-widget#.png
/suto3/google.icondisclosure widget
/suto3/Google画像検索.icondisclosure widget
/suto3/Google定義検索.icon disclosure widget
/suto3/wikipedia.icondisclosure widget
/suto3/weblio.icon disclosure widget
/suto3/kotobank.icon disclosure widget
/suto3/jisho.icon disclosure widget