Automated vs. Manual Testing

The 30% Rule

Automated tools can only detect issues that can be programmatically determined.

• Can Detect: Missing alt attribute, low contrast, missing labels.
• Cannot Detect: Meaningful alt text, logical focus order, keyboard traps, custom widget behavior.

The Strategy

1. Linting: Catch syntax errors in code (eslint-plugin-jsx-a11y).
2. Automated Scans: Use in CI/CD to catch regressions.
3. Manual Review: Tab through every release.
4. Assistive Tech: Test with a screen reader (NVDA/VoiceOver) for critical flows.