Accessibility is cheapest when it's built in from the start. A checklist product teams can actually use before shipping.
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Verify headings are in a logical, non-skipping order, buttons are real <button> elements, and content structure matches its visual hierarchy.
Tab through the entire feature without a mouse — every interactive element should be reachable, operable, and show a visible focus state.
Check text and interactive elements against WCAG AA contrast ratios, and confirm no information is conveyed by color alone.
Test the feature with a real screen reader (VoiceOver, NVDA) rather than relying solely on automated tooling.
Run an automated accessibility scan (like axe) in the existing test suite so basic regressions are caught before merge.