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8 changes: 8 additions & 0 deletions Spec/README.md
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Set to `0` (Installable embedding)


## Font Horizontal Metrics

Regular space and non-breaking space should have the same (positive) width.
GlyphsApp has [Sidebearing arithmetic](https://glyphsapp.com/tutorials/spacing) which allows you to set the non-breaking space to always equal the space.

Your family should have appropriate kerning.
Class-based GPOS kerning is best.

## Font Vertical Metrics

TODO
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