У вашего броузера проблема в совместимости с HTML5
In this project I created a simple desktop volume control knob
Follow me: https://www.instagram.com/engineeringns/
Everything you need is below!
Let me know if you want more info...
http://www.instructables.com/id/Digispark-Volume-Control/
-Digispark ($1.49 w/ free shipping):
http://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=digispark&_sacat=0
-Rotary Encoder ($0.85 w/ free shipping):
http://www.ebay.com/sch/i.html?_odkw=digispark&_osacat=0&_from=R40&_trksid=m570.l1313&_nkw=rotary+encoder&_sacat=0