The test is failing in Blink and WebKit: https://test.csswg.org/shepherd/testcase/first-line-selector-011/spec/css21/name/first-line-selector-011/ Check the following www-style thread for reference: http://lists.w3.org/Archives/Public/www-style/2014Dec/0098.html
Created attachment 460358 [details] Safari 15.5 matches Chrome but differs from Firefox I am able to reproduce this bug in Safari 15.5 on macOS 12.4 using following link: Link - https://test.csswg.org/shepherd/repository/52ee0d2e5ed669cafed3a7a50d3936e6205cac9b/css21/selectors/first-line-selector-011.xht Please refer to attached screenshot for other browsers. Chrome Canary 105 follows Safari 15.5, while Firefox shows expected result and render the output in "GREEN" text. Thanks!
<rdar://problem/95656783>