Variable: highContrastDark

const highContrastDark: Template;

The dark counterpart of highContrast (plan E17.5), for low vision and for users of dark high-contrast modes: black paper, white 16 px text (21:1), yellow 20 px titles, white 2 px axis lines with long outside ticks, a subdued grid, and a colorway in which every color has at least 7:1 contrast against black (WCAG AAA for text, far above the 3:1 of non-text contrast), with hues after Okabe–Ito so the colors stay apart for color-vision deficiencies. Lines are 3 px, markers 9 px with a black rim so overlapping points separate; bars get a black outline between neighbours. Hover labels are white on black with a yellow border. Cividis for sequential data, ColorBrewer PuOr for diverging data. Pair it with config.a11y.patterns for an encoding that doesn't rely on color at all.