It is the practice of building for bodies that are not yours.
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Accessibility is too often delivered as a checklist of contrast ratios and ARIA labels appended to an otherwise indifferent product. The checklist is necessary; it is not sufficient.
Real accessibility is a posture: building with the assumption that the user’s eyes, ears, hands, and attention are not yours. The keyboard-only flow is not an alt path; it is a check on whether the UI was thought through at all.
Ship as if you yourself might rely on the feature next year. The honesty improves the work.