Cannot inspect iOS 11 devices with Safari

Question

I'm trying to debug what apparently is a CSS transform styling bug that only occurs on iOS 11 mobile devices.

But when I try to inspect these devices with Safari, the device name shows briefly on the Develop menu and then disappears.

I'm able to inspect a device running iOS 10 (an iPhone 6) normally, but then the actual issue I'm trying to debug does not occur.

Tried with two different devices running iOS 11 and multiple computers. Also different cables, including original Apple ones.

Mobile device: iPhone 7 11.0.2 (15A421), iPhone 7 11.0.3 (15A432)

Desktop device: MacBook Sierra 10.12.5 (16F73) and others

Safari: Version 10.1.1 (12603.2.4) and others

Answer 1

To inspect/detect iOS11 devices, use Safari Technology Preview