This is caused by [fastclick library](https://github.com/ftlabs/fastclick) used in the page . If i blocked the load of https://teikiyoyaku.tokyu.co.jp/trw/Scripts/lib/fastclick.js , then the <select> will work. The library is quite out-dated , and from it's issue lists , it might not work under new mobile browsers.
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This is caused by [fastclick library](https://github.com/ftlabs/fastclick) used in the page . If i blocked the load of https://teikiyoyaku.tokyu.co.jp/trw/Scripts/lib/fastclick.js , then the <select> will work. The library is quite out-dated , and from it's [issue lists](https://github.com/ftlabs/fastclick/issues) , it might not work under new mobile browsers.