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Get Started Free →Use when reviewing rendered HTML, interactive components, or design-system patterns related to Ensure table headers associate with data cells. Check native semantics first, then inspect keyboard behavior, focus flow, accessible names, and screen-reader output where relevant.
.claude/skills/thedaviddias-th-has-data-cells/SKILL.md| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-22 | ✗→✓ | ▲ Improved | 1% | 0% |
| case-01 | ✓→✓ | ＝ Same ✓ | -9% | 0% |
| case-06 | ✓→✓ | ＝ Same ✓ | -1% | 0% |
| case-02 | ✓→✓ | ＝ Same ✓ | 3% | 0% |
| case-03 | ✓→✓ | ＝ Same ✓ | -23% | 0% |
Orphaned headers without data cells can confuse users of assistive technology and indicate a broken table structure.
<th> must be associated with one or more <td> cellsVerify that all <th> elements are correctly associated with data cells.
Remove empty headers or ensure they are correctly mapped to data cells.
Explain why every header must have associated data to maintain an accessible table structure.
Review the rendered markup and interactive states that affect Ensure table headers associate with data cells. Flag exact elements, roles, labels, focus behavior, or keyboard interactions that violate the rule, and note how to verify the fix with browser accessibility tooling or assistive tech.
For full implementation details, code examples, and framework-specific guidance, see references/rule.md.
Rule page: https://frontendchecklist.io/en/rules/accessibility/th-has-data-cells
| Case | Status | Duration (ms) | Turns | Tokens | Tool calls | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Without | With | Δ | Without | With | Δ | Without | With | Δ | Without | With | Δ | ||
case-01 | pass→pass | 9,380 | 7,196 | -23% | 1 | 1 | 0% | 1,718 | 1,563 | -9% | 0 | 0 | — |
case-06 | pass→pass | 11,127 | 9,484 | -15% | 1 | 1 | 0% | 1,862 | 1,841 | -1% | 0 | 0 | — |
case-02 | pass→pass | 8,660 | 7,130 | -18% | 1 | 1 | 0% | 1,616 | 1,671 | +3% | 0 | 0 | — |
case-03 | pass→pass | 9,878 | 6,016 | -39% | 1 | 1 | 0% | 1,674 | 1,296 | -23% | 0 | 0 | — |
case-04 | pass→pass | 13,591 | 9,985 | -27% | 1 | 1 | 0% | 2,537 | 2,100 | -17% | 0 | 0 | — |
case-05 | pass→pass | 10,435 | 7,365 | -29% | 1 | 1 | 0% | 1,781 | 1,542 | -13% | 0 | 0 | — |
case-07 | pass→pass | 11,379 | 10,307 | -9% | 1 | 1 | 0% | 2,124 | 2,220 | +5% | 0 | 0 | — |
case-08 | pass→pass | 8,019 | 8,860 | +10% | 1 | 1 | 0% | 1,469 | 1,811 | +23% | 0 | 0 | — |
case-09 | pass→pass | 6,163 | 5,901 | -4% | 1 | 1 | 0% | 1,031 | 1,268 | +23% | 0 | 0 | — |
case-10 | pass→pass | 8,640 | 6,396 | -26% | 1 | 1 | 0% | 1,469 | 1,326 | -10% | 0 | 0 | — |
case-11 | pass→pass | 2,341 | 3,339 | +43% | 1 | 1 | 0% | 339 | 764 | +125% | 0 | 0 | — |
case-12 | pass→pass | 10,892 | 9,334 | -14% | 1 | 1 | 0% | 2,030 | 2,099 | +3% | 0 | 0 | — |
case-13 | pass→pass | 13,556 | 10,853 | -20% | 1 | 1 | 0% | 2,218 | 2,020 | -9% | 0 | 0 | — |
case-14 | pass→pass | 11,054 | 10,395 | -6% | 1 | 1 | 0% | 1,947 | 2,019 | +4% | 0 | 0 | — |
case-15 | pass→pass | 8,494 | 6,982 | -18% | 1 | 1 | 0% | 1,630 | 1,524 | -7% | 0 | 0 | — |
case-16 | pass→pass | 7,013 | 6,173 | -12% | 1 | 1 | 0% | 1,356 | 1,360 | +0% | 0 | 0 | — |
case-17 | pass→pass | 12,442 | 6,705 | -46% | 1 | 1 | 0% | 2,193 | 1,441 | -34% | 0 | 0 | — |
case-18 | pass→pass | 10,829 | 10,558 | -3% | 1 | 1 | 0% | 1,972 | 2,213 | +12% | 0 | 0 | — |
case-19 | pass→pass | 3,933 | 4,407 | +12% | 1 | 1 | 0% | 631 | 1,072 | +70% | 0 | 0 | — |
case-20 | pass→pass | 3,240 | 4,014 | +24% | 1 | 1 | 0% | 572 | 1,049 | +83% | 0 | 0 | — |
case-21 | pass→pass | 3,586 | 4,563 | +27% | 1 | 1 | 0% | 625 | 969 | +55% | 0 | 0 | — |
case-22 | fail→pass | 7,197 | 6,240 | -13% | 1 | 1 | 0% | 1,315 | 1,333 | +1% | 0 | 0 | — |
DecimalAI ran this skill against gemini-3.6-flash twice over the same eval suite — once with the skill loaded and once without — and compared the two runs case by case. 22 cases were attempted. The headline lift of +5 percentage points is the difference between those two pass rates over the 22 comparable cases.
Without the skill loaded, the model failed this case. With it loaded, the same prompt on the same model passed. This is one improved case from the latest verified run; every case, including any that regressed, is in the table above.
Other measured skills in the registry, with their headline benchmark lift.