The test imported/w3c/web-platform-tests/css/css-fonts/variations/at-font-face-font-matching.html imported in bug 205866 fails on all platforms imported/w3c/web-platform-tests/css/css-fonts/variations/at-font-face-font-matching.html [ Failure ] The test diff is different on all platforms (more or less FAIL lines), but on all fails.
This oddly appears to be flaky on STP on wpt.fyi: https://wpt.fyi/results/css/css-fonts/variations/at-font-face-font-matching.html?q=is%3Adifferent&run_id=636620001&run_id=648200002&run_id=655990003&run_id=619750003&run_id=642250001&run_id=651930002&run_id=634920003&run_id=638580001&run_id=644400001&run_id=627090004