У вашего броузера проблема в совместимости с HTML5
https://www.simplyscuba.com/products/scubapro-seawing-nova-2-fins
The Seawing Nova Fin from Scubapro combines paddle fin power, acceleration and
maneuverability with a split fin's effortless efficiency and comfort. Its articulated joint, like that of a whale or a dolphin, lets the blade pivot, reducing drag while generating and maximizing thrust.