# `vmtx`: Vertical Metrics table

The `vmtx` table is an OpenType table.

class fontTools.ttLib.tables._v_m_t_x.table__v_m_t_x(tag=None)

  Bases: `table__h_m_t_x`

  Vertical Metrics table

  The `vmtx` table contains per-glyph metrics for the glyphs in a `glyf`, `CFF ``, or ``CFF2` table, as needed for vertical text layout.

  See also https://learn.microsoft.com/en-us/typography/opentype/spec/vmtx

  headerTag = 'vhea'
  advanceName = 'height'
  sideBearingName = 'tsb'
  numberOfMetricsName = 'numberOfVMetrics'
  mergeMap = {'metrics': <function sumDicts>, 'tableTag': <function equal>}
  subset_glyphs(s)