This bug seems identical to https://bugs.chromium.org/p/chromium/issues/detail?id=833837. Test cases from 833837 that fail in Safari 12.1 (but are fine in 11.1 and 12.0): https://jsfiddle.net/8ca1us4u/84/ and attached. Other demo examples at https://github.com/patternfly/patternfly-next/issues/1688.
Created attachment 366739 [details] Test case 2
<rdar://problem/49624125>
I took the test case from attached - it was HTML and turned it into JSFiddle: Link - https://jsfiddle.net/Lhqtjm4n/show It shows "PASS" for all browsers (Chrome Canary 106, Firefox Nightly 105, Safari 15.6.1 and Safari Technology Preview 151). Since all browsers are matching, I am going to mark this as "RESOLVED CONFIGURATION CHANGED", but if I am incorrect, please reopen. Thanks!