Web accessibility testing is a subset of usability testing that ensures anyone can access and use digital content, including people with disabilities. The standards for web accessibility are set by the Web Content Accessibility Guidelines (WCAG), which are based on four principles: Perceivable, Operable, Understandable, and Robust. Web accessibility matters because it helps every person live their best life, builds better relationships with customers, boosts employee loyalty, and reduces risk management issues. Modern technology has improved accessibility testing, allowing for automated testing, continuous scanning, and integration with development environments. To select the right web accessibility testing tool, look for a platform that tests both web and mobile apps, shifts automated testing left, provides clear step-by-step tests, spots compliance issues, and consolidates results for easy access and analysis.