Created attachment 307977 [details] screenshot of the issue - Create element with border-radius - add top and bottom borders having different colours (e.g. red and blue, correspondingly) - behold top border having both both colours: - its own colour (red) in centre - colour of the bottom border (blue) on both right and left ends
Created attachment 308193 [details] Even more incorrect.
<rdar://problem/31841344>
I am able to reproduce this bug in Safari 16 and Safari Technology Preview 154 using both test cases (JSFiddle and attached). While other browsers (Chrome Canary 108 and Firefox Nightly 107) match each other and does not have color bleed into other like Safari. Thanks!