| Failure | WCAG | Level | How often we see it |
| The same link text, different destinations | 2.4.4 | A | 61% |
| Navigation isn’t coded as a list | 1.3.1 | A | 49% |
| Low text contrast | 1.4.3 | AA | 48% |
| Controls screen readers can’t use | 4.1.2 | A | 48% |
| Duplicate element IDs | 4.1.1 | A | 44% |
| Vague link text (“read more”) | 2.4.4 | A | 43% |
| Form fields with low contrast | 1.4.11 | AA | 43% |
| No visible focus indicator | 2.4.7 | AA | 40% |
| Headings with no text | 1.3.1 | A | 37% |
| Autofill purpose missing | 1.3.5 | AA | 36% |
| Page won’t reflow on small screens | 1.4.10 | AA | 34% |
| Page has no top-level heading | 1.3.1 | A | 33% |
| Page language not specified | 3.1.1 | A | 32% |
| Data tables missing header cells | 1.3.1 | A | 30% |
| Links signalled by color alone | 1.4.1 | A | 29% |