[css-fonts-4] Use the ital axis when matching font-style: italic - #14412
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…12836 In the font matching algorithm, mirror the existing slnt instantiation text for variable fonts: for font-style: italic, a match is created by setting the ital axis value to 1. Also clarify in both oblique branches that the ital axis is not used to satisfy an oblique request, matching the discussion in issue w3c#12836. This aligns the matching algorithm with the font-style property definition, which already states that "the ital variation with a value of 1 is used to implement the italic values".
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Aug 31, 2026
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Closes #12836.
As discussed in #12836, the Font Matching Algorithm only has explicit variable-font instantiation text for the
slntaxis in the oblique branches, while thefont-styleproperty definition already states that "theitalvariation with a value of 1 is used to implement the italic values".This change:
italicbranch of the matching algorithm, mirroring the existingslntsentence: "For variable fonts with an ital axis, a match is created by setting the ital value to 1."obliquebranches that theitalaxis is not used to satisfy an oblique request (per @jfkthame's point in the issue, which @drott supported).Consequence for fonts exposing both
slntanditalaxes: theitalickeyword setsitalto 1 (leavingslntat its default), andobliquesetsslnt(leavingitalat its default). This matches what Gecko ships today.Implementation interest: Gecko already behaves this way; Chromium implementation is prepared in https://chromium-review.googlesource.com/c/chromium/src/+/8179764 pending this spec clarification (Chromium bug: https://issues.chromium.org/issues/40681464).