Exercise 2: A Red-or-Green-Only Status Dot Is a Real Accessibility Problem — Possible Solution
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This is a real, measurable problem because it relies entirely on
color to convey the server's own status, with nothing else - no
label, no icon, no text - to distinguish the two states. This chapter's
own prevalence data shows that roughly 1 in 12 men (about 8%) and
roughly 1 in 200 women (about 0.5%) have congenital red-green color
blindness, the most common form of color vision deficiency - and
red-green is exactly the color pair being used here.

For a meaningful share of real users, a red dot and a green dot can
look genuinely indistinguishable, or close enough that the dashboard
provides no reliable way for them to tell whether the server is up or
down. This isn't a hypothetical edge case affecting a handful of
people - it's a real, documented, sizable percentage of the user
population, particularly among men, given how directly this dashboard
is likely to be used by a technical audience.

The direct fix, per this chapter's own design rule, is to never convey
information with color alone - adding a label ("Online"/"Offline"), a
distinct icon shape, or a text status alongside the color would let
every user, including those with red-green color blindness, read the
status reliably.

ANSWER: This is a real accessibility problem because it uses only
color - specifically red versus green, the exact pair affected by the
most common form of color blindness - to convey status. Given that
roughly 8% of men and 0.5% of women have red-green color blindness,
this design is genuinely unreadable to a meaningful share of users.
The fix is to add a label, icon, or text alongside the color so status
doesn't rely on color perception alone.

WHY THIS WORKS AS AN ANSWER
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This correctly cites the chapter's own specific real prevalence
figures and identifies red-green as exactly the color pair most
affected, rather than treating color-blindness accessibility as a
vague, unquantified concern.