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The Web Accessibility (a11y) skill equips Claude with specialized knowledge to help developers build inclusive web applications that meet global compliance standards. It provides expert guidance on WCAG 2.1/2.2 guidelines, the proper application of ARIA attributes, and the implementation of semantic HTML. Whether you are refactoring legacy code for compliance or building complex interactive widgets from scratch, this skill ensures your interfaces are perceivable, operable, understandable, and robust for all users, including those using assistive technologies.