Build accessible user interfaces with semantic HTML, proper ARIA attributes, keyboard navigation, and screen reader compatibility. Use this skill when creating or modifying HTML markup, UI components, forms, or interactive elements. When implementing keyboard navigation, focus management, or tab order. When adding alternative text for images or labels for form inputs. When ensuring sufficient color contrast ratios. When working with navigation menus, modals, buttons, or dynamic content. When structuring pages with proper heading hierarchy (h1-h6). When testing UI changes for screen reader compatibility.

Compare production WordPress sites against their baked static versions to find differences. Use when testing Bake deployments, checking for missing assets, broken styles, console errors, or any visual/functional discrepancies between production and static sites. Triggers on requests to compare sites, verify bake output, check for differences, or test static deployments.

Implement secure, comprehensive input validation on both client and server sides using allowlists, type checking, and sanitization to prevent injection attacks. Use this skill when handling user input from forms, API requests, or any external data source. When implementing form validation logic with field-specific error messages. When validating data types, formats, ranges, and required fields. When sanitizing input to prevent SQL injection, XSS, or command injection. When validating business rules like sufficient balance or valid date ranges. When implementing both client-side validation for user experience and mandatory server-side validation for security.