Visit https://sha1.badssl.com on Mac OS X 10.13.3 High Sierra.

Observe: Interstitial shows NET::ERR_CERT_INVALID and cannot be clicked through. The net-internals log shows SOCKET_POOL_CONNECT_JOB_CONNECT --> net_error = -207 (ERR_CERT_INVALID).

(This is a reduced repro for a user complaint: https://productforums.google.com/forum/?utm_medium=email&utm_source=footer#!msg/chrome/KZInqK2Fo0w/prcVip77AAAJ)

In Safari, the user can click through the interstitial after providing administrator credentials.