Outline tops winAscent (Windows clips it)

Audit code: metrics-win-below-extrema-top

Definition

A drawn outline reaches above winAscent. Windows clips rendering at winAscent regardless of the typo metrics, so the tallest glyph — usually an accented capital like Á — loses its top. This is one of the most common reasons resellers (MyFonts, foundry platforms) reject otherwise-finished fonts. Raise winAscent to at least the tallest outline's top.

How Patens surfaces this

The Patens audit module checks for metrics-win-below-extrema-top 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 metrics-win-below-extrema-top firing on real glyphs, or check your own work from the CLI:

npx patens audit your-project.font.json

Canonical references

Primary literature where this rule is established or explained. Drawn from the open-licensed corpus — browse the full 42-source canonical library or read the research artifact.

The canonical authority for this rule sits in the in-copyright craft canon (Tracy, Smeijers, Noordzij, Cheng) which requires licensing before body-text ingestion. We cite these by bibliographic reference only — see the library for the full 42-source canon, or the research artifact Section 2 for the family-specific citation matrix. Q3 2026 work expands the corpus once publisher relations land.

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