charton API / @chart-on/core / index / contrastRatio
Function: contrastRatio()
contrastRatio(
foreground,background):number
Defined in: packages/core/src/util/color.ts:120
WCAG contrast ratio of foreground on background, from 1 to 21. A translucent foreground is blended over the background first; the background's own opacity is ignored, as nothing is known about what is under it. Throws, like parseColor, for a colour it cannot read; check with isColor first.
Parameters
foreground
string
background
string
Returns
number