Variable colour fonts

A colour font's paints can vary with the axes: a solid's opacity, the geometry and the colour stops of a gradient, and the translation, scale, rotation and skew that place a layer. Each row below is the same fourteen glyphs, one for each variable paint format of COLR version 1, at another location; the PDF paints the numbers that apply there as ordinary vector fills.

font-weight: 100
ABCDEFGHIJKLMN
font-weight: 400
ABCDEFGHIJKLMN
font-weight: 600
ABCDEFGHIJKLMN
font-weight: 900
ABCDEFGHIJKLMN
font-stretch: 75%
ABCDEFGHIJKLMN
font-stretch: 125%
ABCDEFGHIJKLMN