W3C CSS2 Cascading Style Sheets, level 2 - instructional media + ...

This table suggests where such information can be found, for common font
formats.
Descriptor Type 1
TrueType and
OpenType
TrueType GX [TRUE-
TYPEGX]
’ascent’
’Ascender’
in AFM/PFM
file
’Ascender’ in
’hhea’ table or
(preferably)
’sTypoAscender’
in ’OS/2’ table
’horizontalBefore’
in ’fmtx’ table
’baseline’
bsln table, see note
[p. 306]
’bbox’
FontBBox,
font dictionary
’xMin’, ’xMax’,
’yMin’ and
’yMax’ entries of
the ’head’ table
’cap-height’
CapHeight in
AFM/PFM file
’descent’
’Descender’
in the
AFM/PFM file.
’mathline’ bsln table
’font-family’
’stemh’
’stemv’
FamilyName,
fontinfo dictionary
StdHW, private
dictionary of
AFM/PFM file
/StdVW,
private dictionary
name table
cvt table
’topline’ bsln table
’unicode-range’ cmap file
OS/2 table, see
Appendix C [p. 302]
’units-per-em’
FontMatrix,
font dictionary
unitsPerEm, head
table.
’widths’ hmtx table
Within the bsln table, the ideographic centered baseline may be
used for stretches of predominantly ideographic characters and the ideographic
low baseline is more suitable for ideographic characters in a
run of predominantly Latin, Greek or Cyrillic characters.
306