182042 2018-01-24 01:59:43 -0800 'vert' font feature is not enabled in vertical text 2023-08-27 14:04:10 -0700 1 1 1 Unclassified WebKit Text Other Unspecified Unspecified NEW InRadar, WPTImpact P2 Normal --- 246579 1 mmaxfield webkit-unassigned ahmad.saleem792 chris frankhome61 mmaxfield ntim prj_eppe_svg webkit-bug-importer oldest_to_newest 1392497 0 mmaxfield 2018-01-24 01:59:43 -0800 We should enable it when rendering vertical text. 1392498 1 webkit-bug-importer 2018-01-24 02:00:04 -0800 <rdar://problem/36817474> 1404502 2 chris 2018-03-07 15:32:07 -0800 Steps to reproduce the problem: 1. Go to https://test.csswg.org/harness/test/css-fonts-3_dev/single/font-kerning-03/format/html5/ 2. Compare test result to reference page (linked from the above url) Firefox passes the test correctly. WebKit, Edge and Chrome do not Spec text: " When rendering with OpenType fonts, the [OPENTYPE] specification suggests that kerning be enabled by default. When kerning is enabled, the OpenType kern feature is enabled (for vertical text runs the vkrn feature is enabled instead)." https://drafts.csswg.org/css-fonts-3/#font-kerning-prop WebKit passes the equivalent test for horizontal text (with the `kern` feature; the bug is just in vertical text. This looks like a simple oversight. The test case is in web platform tests, in CSS/css-fonts/font-kerning-03.html and the reference is font-kerning-03-ref.html https://github.com/w3c/web-platform-tests/blob/master/css/css-fonts/font-kerning-03.html https://github.com/w3c/web-platform-tests/blob/master/css/css-fonts/font-kerning-03.html 1621808 3 frankhome61 2020-02-21 16:37:48 -0800 Just another reminder, WPT test https://github.com/web-platform-tests/wpt/blob/master/css/css-writing-modes/text-orientation-mixed-vrl-100-ref.html also fails due to this issue. 1884603 4 mmaxfield 2022-07-16 20:20:03 -0700 *** Bug 198638 has been marked as a duplicate of this bug. *** 1973837 5 ahmad.saleem792 2023-08-27 14:04:10 -0700 https://wpt.fyi/results/css/css-fonts?label=master&label=experimental&product=chrome&product=firefox&product=safari&aligned=&view=interop&q=font-kerning ^ font-kerning* tests.