ContrastCollisionsUnverifiable (3)All 67 measured pairs clear their target. Each is a foreground against a ground the surface model says it lands on, rather than against the page alone.
Every role is distinguishable from every other. A collision is two roles a reader cannot tell apart, which no contrast measurement can see: both may clear the page and still say the same thing.
Not a softer failure: these pairs were never measured, because the ground is not knowable: what sits behind a caption over a photograph is the photograph. Folding them into the passes is how a guarantee becomes a claim about the pairs that happened to be easy.color-foreground on color-overlaycolor-foreground on color-wellcolor-foreground-media on color-surface-media