There's a problem in touching a select element on Microsoft Edge or on Windows 10 Mobile app.
When you touch the select element, it won't open the options or the options are open twice.
It seems to be interfered with Ionic Framework's tapping (http://ionicframework.com/docs/api/page/tap/).
The solution is simple: disabling the tab system.
For select element, I use
<select data-tap-disabled="true" ...></select>That solves the problem. Tapping on the select element will open the options correctly.
