Cache implements cached layout and shaping of text from a set of registered fonts.

Font specify a particular typeface variant, style and weight.

A FontFace is a Font and a matching Face.

A Line contains the measurements of a line of text.

Face implements text layout and shaping for a particular font.

Shaper implements layout and shaping of text.

Style is the font style.

Typeface identifies a particular typeface design.

Variant denotes a typeface variant such as "Mono" or "Smallcaps".

Weight is a font weight, in CSS units subtracted 400 so the zero value is normal text weight.