https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q13270251693
No-Library (pure JS), HTML, CSS, JavaScript
https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q10269735340
https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q13269633078
https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q14268694489