Flash in the Pan on Matt Green
#ff9977 on #39ad48
Body text at this size
And the smaller size most interfaces actually use for paragraphs — the size that decides whether a pair is usable.
Caption text, which almost nothing passes.
WCAG 2.1
1.39:1
Fails AA
Not AAA (7:1). Swapping the two colours gives the same number — the ratio does not know which is the text.
APCA
Lc -14.1
Below Lc 15: the draft treats this as not text.
Light text on a darker ground — the negative sign is the polarity.
Colour difference
ΔE00 56.0
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#5d1a00 is the nearest colour of the same hue that passes AA on #39ad48, at 4.50:1. Only the lightness moved, and some chroma was given up to stay inside sRGB — which is the point: your colour stays recognisably your colour.
And to someone missing a cone
protanopia
Ratio 1.07:1, ΔE00 8.5.
deuteranopia
Ratio 1.59:1, ΔE00 11.7.
tritanopia
Ratio 1.95:1, ΔE00 70.6.
The weakest of the three is protanopia, where the two are ΔE00 8.5 apart against 56.0 for a trichromat — still two colours, but a closer call than it looks to you.
Both colours have pages of their own: Flash in the Pan ·Matt Green · the same pair the other way round ·all pairs