[Webkit-unassigned] [Bug 182042] 'vert' font feature is not enabled in vertical text

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=182042

Chris Lilley <chris at w3.org> changed:

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                 CC|                            |chris at w3.org

--- Comment #2 from Chris Lilley <chris at w3.org> ---
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

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