У вашего броузера проблема в совместимости с HTML5
https://howtomechatronics.com/tutorials/arduino/how-to-use-a-rgb-led-with-arduino/ ►Find more details, circuit schematics and the source code here.
In this tutorial we will learn what RGB LED is and how to use it with the Arduino Board.
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Music: Aduro by Jens Kiilstofte (machinimasound.com/music)