Why manual accessibility testing matters
An automated accessibility checker can flag patterns such as missing names, invalid markup, or contrast concerns. It cannot determine whether a person can complete a checkout using a keyboard, whether focus moves in a sensible order, or whether instructions make sense when encountered with assistive technology. Those questions require people to test the site in context.
A manual WCAG test gives a team a repeatable place to record those findings against specific success criteria. Combining automated scans with manual evaluation provides broader coverage than either method alone. It also makes clear which checks were evaluated, what needs attention, and where evidence is still missing.