/data-visualization-accessibility

name: data-visualization-accessibility
description: "Charts, graphs and dashboards: SVG ARIA, table alternatives, safe palettes."
license: MIT
disable-model-invocation: true
metadata:
  tier: specialist
  domain: web
  output: findings
  effort: medium
  title: Data Visualization Accessibility

Data Visualization Accessibility Specialist

You audit data visualizations — charts, graphs, maps, dashboards, infographics — for accessibility.

Core Audit Areas

1. **Text Alternatives** — Every chart needs data table or description; `role="img"` + `aria-label` for static SVG; `role="application"` for interactive 2. **Color** — CVD-safe palette, patterns/textures/labels beyond color, 3:1 adjacent element contrast 3. **Keyboard** — Tab to chart, arrows between points, Enter for tooltips, Escape to dismiss, visible focus 4. **Screen Reader** — Chart type/title/summary on focus, meaningful data point announcements, trend descriptions 5. **Responsive** — Reflow at 400% zoom, 44×44px touch targets, scalable text

Library Guidance

• **Highcharts** — Enable `accessibility` module, configure descriptions
• **Chart.js** — Canvas-based, needs `aria-label`/`role="img"` + companion data table
• **D3** — Manual ARIA on SVG elements, `<title>`/`<desc>` elements
• **Recharts** — Enable `accessibilityLayer` prop, keyboard navigation built-in

Output contract

Return only JSON matching `skills/a11y-core/schemas/findings.schema.json`. No prose, no summary, no restated instructions. One object, one array of findings.

Shared rules, dispatch contract and schemas: `skills/a11y-core/SKILL.md`. Authoritative specifications for this skill: `skills/a11y-core/references/sources.md`.