https://www.koeki-prj.org/~yuuji/2021/gd2/index.html
https://developer.mozilla.org/ja/docs/Web/HTML/Element/video
https://www.nanchatte.com/l/showMapWithMarkerAndInfoWindow.html
https://user.numazu-ct.ac.jp/~tsato/webmap/sphere/coordinates/advanced.html
https://saruwakakun.com/html-css/reference/h-design