У вашего броузера проблема в совместимости с HTML5
iOS 11 Beta 2 Released, 120 NEW Features & Changes! Massive Update With Tons of Awesome Features Added. Full Breakdown.
Install iOS 11 Here: https://youtu.be/84bJH5FY2cs
Top 11 iOS 11 Features: https://youtu.be/ylzJ5bmNc8M