У вашего броузера проблема в совместимости с HTML5
Find out more information: http://bit.ly/STM32H7A3-7B3 & http://bit.ly/ST-STM32H7-DISCO-KIT
Download the free TouchGFX GUI software, try the Out-of-the-Box supported STM32H7B3I-DK, and eliminate the need for external ram, when developing your next embedded UI