Effective accessibility testing is achieved by focusing on three critical aspects: Coverage, Completeness, and Correctness, collectively known as the 3Cs. Coverage ensures that a wide range of Web Content Accessibility Guidelines (WCAG) Success Criteria are assessed, while Completeness involves using advanced techniques and AI to uncover nuanced accessibility issues that might be missed by surface-level checks. Correctness emphasizes minimizing false positives to provide meaningful and actionable insights. BrowserStack's Spectra™ Rule Engine exemplifies this approach by automating the detection of over 40 WCAG SCs, significantly reducing manual effort and enhancing compliance and user experience for individuals with disabilities. By striking a balance between broad coverage and minimal false positives, BrowserStack's accessibility testing solution offers both reach and reliability, leading to better accessibility outcomes and stronger digital experiences.