How to detect that browser is running in Safari on iOS 11 via JavaScript? -


i want detect js code in webpage running in safari on ios 11, supports new features.

i can 

if (window.navigator.useragent.includes('os 11_0')) {     // ios 11 }

but believe considered unreliable.

is there feature or hack works on ios 11 , not on other os , can used detect version without inspecting useragent?


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