A11y Preflight looks for common accessibility problems that often affect real pages. That includes missing document language, missing or empty title tags, images without useful alt text, unlabeled form controls, vague or missing interactive text, heading structure issues, missing main landmarks, and skip-link basics.
The goal is not to replace a full accessibility audit. The goal is to help you spot obvious issues quickly so the page is in better shape before deeper manual testing.
Small accessibility problems can create bigger usability barriers than people expect. Missing labels, unclear button text, poor heading structure, and weak landmarks can make pages harder to understand, navigate, and use with screen readers, keyboards, and other assistive tools.
Even simple fixes can make a page easier to move through and easier to understand for a wider range of users.
Fix critical issues first, then work through warnings. After that, do a manual keyboard pass, check focus visibility, and review the page with a screen reader or accessibility browser tools for anything automated checks can miss.
This tool works best as a practical first pass before a deeper accessibility review, not as the final word on WCAG compliance.