FrontendHaltAccessibility·Intermediate·Conceptual·1 min read
Why shouldn't a required piece of information be conveyed by color alone?
Short interview answer
Users with color vision deficiencies, or anyone viewing the page in poor lighting or on a low-quality display, may not reliably perceive the color difference, so the same information needs a redundant channel such as text, an icon, or a pattern.
Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.