The test is an image failure. Line-clamp doesn't respect bottom-border. See: https://build.webkit.org/results/WPE-Linux-64-bit-Release-Tests/r270164%20(21222)/imported/w3c/web-platform-tests/compat/webkit-box-clamp-bottom-border-diffs.html
<rdar://problem/71791354>
Test passing since https://commits.webkit.org/256989@main https://results.webkit.org/?suite=layout-tests&test=imported/w3c/web-platform-tests/compat/webkit-box-clamp-bottom-border.html&platform=GTK&platform=WPE&platform=mac&platform=ios Removed test from TestExpectations in https://commits.webkit.org/259674@main. Closing bug.