Quality engineering

Atomic accessibility coverage: 13 skills (a11y-violation-gate, aria-authoring-patterns, axe-a11y, ibm-equal-access-a11y, lighthouse-a11y, pa11y-a11y, screen-reader-test-author, wave-a11y, wcag-checklist-builder, wcag-color-contrast, wcag-focus-trap, wcag-keyboard-navigation, wcag-compliance-reporter) and 2 agents (accessibility-code-critic, screen-reader-test-executor).

Firefox + Chrome extension lifecycle, MV2 to MV3 migration, host-permission prompts, and storage.sync vs storage.local test patterns

Chart + data viz testing: 3 skills (chartjs-snapshot-tests, d3-snapshot-tests, vega-spec-validator) and 1 agent (chart-test-author). Covers Canvas + SVG + declarative-spec visualizations, complementing qa-visual-regression which targets general UI screens.

Data quality testing for analytical pipelines: 5 skills (dbt-testing, great-expectations, soda-checks, data-quality-gate, data-quality-conventions) and 2 agents (schema-diff-reviewer, data-anomaly-triager).

Localization (l10n) + i18n testing: 4 skills (i18n-string-coverage, locale-format-validator, pseudo-localization-runner, rtl-rendering-tester) and 1 agent (l10n-audit-runner).

Modern web testing: 5 skills (browser-extension-tests, pwa-install-flow-tests, service-worker-tests, sw-cache-strategy-author, web-vitals-inp-deep) and 1 agent (modern-web-health-agent). Covers PWA + Chromium MV3 extensions + INP responsiveness.

PDF + print rendering tests: 4 skills (html-to-pdf-regression, pdf-accessibility-checker, pdf-snapshot-tester, print-stylesheet-tests) and 1 agent (pdf-test-author). Covers print/PDF output where qa-visual-regression covers screen output.

Workbox recipes, offline fallback patterns, Lighthouse PWA audit interpretation, and web-push subscription lifecycle testing — distinct from qa-modern-web's generic SW/install/cache-strategy skills and qa-notifications' cross-channel push harness

Visual regression testing: 8 skills (chromatic-visual-regression-testing, percy-visual-regression-testing, playwright-snapshots, responsive-breakpoint-runner, storybook-visual-regression-testing, visual-baseline-conventions, visual-baseline-gate, visual-diff-summarizer) and 3 agents (visual-baseline-curator, visual-ci-gate-orchestrator, visual-diff-classifier).