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fonts/axisregistry/README.md
Nathan Williams 4bd3c05add
GF Axis Registry setup (#2541) 
* Add GF Axis Registry files to git repo.

* Update root README.md with a description of the axisregistry/ subdir.

* Update root README.md with a description of the axisregistry/ subdir.

* Revise the axis registry README file to be simpler and also descrie the metadata fields of the axis textprotos.
2020-07-13 15:52:55 -07:00

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GF Axis Registry

This package contains a collection of metadata files that collectivefly form the GF Axis Registry.

Why does Fonts have its own Axis Registry?

We plan to support a superset of the OpenType axis registry and additional metadata. Individual variable fonts support a subset of our axis registry. Axes not in our registry will not function via our API.

Axis Metadata Fields

  • tag
    • Tag for the axis used to specify an axis in font-variation-settings and CSS API requests.
  • display_name
    • Readable name for the axis, generally the expanded form of tag.
  • min_value
    • Lower bound of the axis. Inclusive.
  • max_value
    • Upper bound of the axis. Inclusive.
  • default_value
    • Default position of the aixs.
  • precision
    • Describes the specificity at which an axis position can be specified. For example, 0 means values must be specified as whole numbers while -1 means values can be as precise as one decimal place.
  • fallback (repeated)
    • Important positions along the axis. For weight, these are positions like Regular, Medium, and Bold.
  • description
    • A description of the axis.