У вашего броузера проблема в совместимости с HTML5
If your new to the Arduino Pro mini the it may be a bit confusing on how to program one. I will show you how using a USBASP programmer.
USBASP on Amazon http://a.co/iHb0hP0
Drivers for USBASP http://www.fischl.de/usbasp/
Patreon https://www.patreon.com/justgomakeit