BASE table

Defines baseline positions for scripts and languages used in horizontal and vertical text layout.

Scope

• Format family: Shared SFNT
• Table tag in JSON: BASE

Specs

• https://learn.microsoft.com/en-us/typography/opentype/spec/base
• OpenType table registry: https://learn.microsoft.com/en-us/typography/opentype/spec/otff#font-tables

JSON Skeleton

This skeleton reflects fields currently parsed/written by Font Flux JS for this table.

{
  "tables": {
    "BASE": {
      "majorVersion": 0,
      "minorVersion": 0,
      "horizAxis": null,
      "vertAxis": null,
      "itemVariationStore": null,
      "_checksum": 0
    }
  }
}

Top-level Fields

• majorVersion - number (0..65535)
• minorVersion - number (0..65535)
• horizAxis - implementation-defined
• vertAxis - implementation-defined
• itemVariationStore - implementation-defined

Additional Nested Keys Seen In Implementation

• horizAxis
• vertAxis
• itemVariationStore
• tag
• baseValues
• defaultMinMax
• langSystems
• minMax
• baseCoords
• minOff
• maxOff
• minCoord
• maxCoord
• featMinMax
• referenceGlyph
• baseCoordPoint
• device
• min
• max

Notes

• Preserve _checksum for stable round-tripping.
• If a table is only partially understood, prefer keeping unknown bytes in _raw instead of dropping data.
• Validate with .validate() after edits.