Why is a manual accessibility test necessary if I use automated scanners?

While automated scanners are excellent for catching simple code errors, they can only detect about thirty to forty percent of all accessibility issues. A manual accessibility test is necessary to evaluate complex interactive elements like dropdown menus, modal windows, and custom forms. Automated tools cannot determine if alternative text accurately describes a complex diagram or if a keyboard tab order is logical. They also struggle to identify keyboard traps where a user becomes stuck inside a specific page element. By combining automated tools with manual testing, you get a complete picture of your website compliance. This dual approach is a core part of any robust accessibility audit checklist. It ensures that your business meets the strict standards required for web dev compliance DACH. Ultimately, manual testing simulates real-world user experiences, which automated software simply cannot replicate.