googlefonts__weightclass

Check the OS/2 usWeightClass is appropriate for the font's best SubFamily name.

googlefonts/weightclass

• Applies to: TTF
• Fontspector can hotfix?: no
• Fontspector can fix sources?: no

Rationale

Google Fonts expects variable fonts, static ttfs and static otfs to have differing OS/2 usWeightClass values.

• For Variable Fonts, Thin-Black must be 100-900

• For static ttfs, Thin-Black can be 100-900 or 250-900

• For static otfs, Thin-Black must be 250-900

If static otfs are set lower than 250, text may appear blurry in legacy Windows applications.

Glyphsapp users can change the usWeightClass value of an instance by adding a 'weightClass' customParameter.

Proposal

• https://github.com/fonttools/fontbakery/issues/4829

Profiles

• googlefonts (in section 'Font File Checks')