WebAIM: The WebAIM Strategic Accessibility Framework
Accessibility checklist | Webflow
W3C Accessibility Maturity Model
Checklist - The A11Y Project
Accessibility Heuristics | Deque Systems
Intro to Accessibility Heuristics
Denis Boudreau, a UX accessibility expert at Deque Systems, walks you through the fundamentals of heuristics as a design evaluation tool and will introduce a set of accessibility-focused heuristics that can help you assess accessibility during the design phase.
Visa Accessibility - Visa Global Accessibility Requirements
WebAIM: Web Accessibility for Designers