[Webkit-unassigned] [Bug 206898] Glyphs with `rvrn` substitutions don't respond to letter-spacing with variable font, Safari macOS & iOS

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Jan 28 21:54:50 PST 2020


--- Comment #1 from Stephen Nixon <stephen at arrowtype.com> ---

Adding the CSS 'font-feature-settings' and any stylistic set makes the spacing respond as expected (even if the stylistic set doesn't affect the characters in a given piece of text).

Here is a GIF demonstrating this CSS hack:


This leads me to believe that it might be something related to the text renderer used to render variable fonts ... perhaps a slower / more careful one should be used in text that includes rvrn substitutions? This is a total guess at what is happening and what might fix it, based on my understanding of a fix to an older problem with variable fonts in web browsers (contour overlaps were once rendered with faint hairlines – https://twitter.com/ThunderNixon/status/1009878237068001280?s=20).

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