Naven
Glossary
Lighthouse
Google's page-auditing tool, built into Chrome.
It loads a page under simulated conditions and scores performance, accessibility, best practices and SEO, listing what to fix. The scores are lab numbers on a throttled connection, so they are stricter than reality and useful as a relative signal rather than an absolute one.
The accessibility audit is the most valuable part and the least used: it catches missing alt text, unlabelled controls and contrast failures in seconds.
Where Naven stands
Naven's pages are checked with it, and its accessibility findings are treated as defects rather than suggestions.