Sidebearing class drift (LSB)
Audit code: sidebearing-class-drift-lsb
Definition
This glyph's left sidebearing has drifted from the median of its sidebearing-class peers. Either re-apply the class or remove this glyph from it.
How Patens surfaces this
The Patens audit module checks for sidebearing-class-drift-lsb across five teaching surfaces: the edit-panel inline issue list, the
project-wide audit page, the release pre-flight check, the family hub,
and the home-page project tile. Every surface shows the same plain-English
explanation and links back to this page. This rule is detection-only — there's no automatic fix because the
correction is design-dependent (it requires a judgment call about the
glyph's intended shape or the font's intended behaviour). The audit
message links to the specific glyph or field that needs attention.
Run this check yourself
Patens runs every audit rule live as you draw — including this one.
The editor (in private alpha) shows sidebearing-class-drift-lsb firing on real
glyphs, or check your own work from the CLI:
npx patens audit your-project.font.json