Interface: FontMetrics

Font metrics extracted from a font file. Values are in the font’s design units coordinate space.

Properties#

Property	Type	Description
ascender	number	The ascender value in font design units.
descender	number	The descender value in font design units (typically negative).
unitsPerEm	number	The number of units per em square (typically 1000 or 2048).
lineGap	number	The OS/2 sTypoLineGap value in font design units.
capHeight	number	The OS/2 sCapHeight value in font design units.
xHeight	number	The OS/2 sxHeight value in font design units.
underlineOffset	number	The post.underlinePosition value in font design units (typically negative).
underlineSize	number	The post.underlineThickness value in font design units.
strikeoutOffset	number	The OS/2 yStrikeoutPosition value in font design units.
strikeoutSize	number	The OS/2 yStrikeoutSize value in font design units.