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Accessibility is easiest to preserve when it is part of the component contract rather than a final audit. A component contract describes what an element means, how it can be reached, which inputs operate it, and how state changes are communicated. Styling then supports that behavior instead of trying to reconstruct it later.
Begin with native semantics. A heading should represent document structure, a link should navigate, and a button should perform an action. Native elements carry keyboard and assistive-technology behavior that custom containers must otherwise recreate. Accessible names need to remain meaningful outside the visual layout; an icon alone rarely explains a destination or consequence.
Keyboard support is not just the ability to press Tab. Focus order should follow reading order, focus must remain visible, and overlays need a title, containment, Escape behavior, and restoration to the control that opened them. New-tab links should disclose that change. Touch targets need enough area without forcing a dense interface to become visually oversized.
Dynamic tools add timing concerns. Typing metrics, connection status, and validation feedback may need live announcements, but announcing every keystroke or animation creates noise. Use polite, rate-limited updates for information that helps the task. Respect reduced-motion preferences and avoid making motion the only way to perceive a transition.
Responsive behavior is also accessibility. Content must reflow at narrow widths without horizontal traps, clipped controls, or text that requires zooming out. High-contrast and light themes should preserve semantic colors rather than merely invert the palette.
Tests can verify headings, roles, labels, focus movement, and disclosures. Browser review is still necessary for reflow, screen-reader experience, contrast, and real interaction. When these checks begin with the component API, accessible behavior becomes reusable. Every route that composes the component receives a stronger baseline instead of repeating the same repair work.