# `bsln`: Baseline

The `bsln` table is an Apple Advanced Typography (AAT) table.

class fontTools.ttLib.tables._b_s_l_n.table__b_s_l_n(tag=None)

  Bases: `BaseTTXConverter`

  Baseline table

  The AAT `bsln` table is similar in purpose to the OpenType `BASE` table; it stores per-script baselines to support automatic alignment of lines of text.

  See also https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6bsln.html

  closure_glyphs(s)
  subset_glyphs(s)