Hello,
I've recently installed the iOS11 beta on my iPhone 7 device to test our Cordova application on it and make sure everything is fine. The first thing I noticed is that on Mac, Safari does not see the device, even though web inspector is activated in the device. Without it I am not able to debug the second issue: we have a position absolute element displayed in one of the pages and when scrolling down and up the element or its children disappear randomly. This issue can be found on StackOverflow and other forums but the recommended fix ( applying transform translate3d(0, 0, 0) to the element does not work.
Also note that in the simulator for ios11, the web inspector is able to see the webview.