У вашего броузера проблема в совместимости с HTML5
I spent many months searching the internet to figure out how to drive this LED Strip with a raspberry pi and most of the internet has said it's impossible because of the timing requirements of these LEDs but I found a great adafruit article explaining how to do it and walk through of how I implanted it.
Adafruit Article: https://learn.adafruit.com/neopixels-on-raspberry-pi/overview