More in Design Systems — page 4
Shadow DOM accessibility: focus and cross-boundary ARIA
WHAT IT TESTS: Shadow DOM a11y limits. OUTLINE: IDREF ARIA can't cross the shadow boundary, so aria-labelledby and aria-activedescendant break; delegatesFocus and ElementInternals/ARIAMixin help. RED FLAG: assuming ARIA id references work across shadow roots.
Adapting CSS for Forced Colors Mode
WHAT IT TESTS: supporting forced-colors accessibility. OUTLINE: use semantic HTML and system color keywords, the forced-colors media query, forced-color-adjust sparingly. RED FLAG: ignoring it, or assuming background images and box-shadows still convey state.
Accessible toasts with ARIA live regions
WHAT IT TESTS: announcing dynamic content without moving focus. OUTLINE: a persistent live region, polite vs assertive by urgency, role status or alert, content injected after mount. RED FLAG: moving focus to the toast or creating the region at announce time.
Enforcing an accessible name on icon-only buttons
WHAT IT TESTS: API design that guarantees an accessible name. OUTLINE: require aria-label via the type system for icon-only variants, warn at runtime, decorate the icon as aria-hidden. RED FLAG: trusting developers to remember a label on icon buttons.
ARIA roles and keyboard nav for a Tabs component
WHAT IT TESTS: the tabs ARIA pattern. OUTLINE: tablist, tab, tabpanel roles with aria-selected and aria-controls; arrow keys move tabs, Tab moves to the panel via roving tabindex. RED FLAG: making every tab a Tab stop or omitting aria-selected.
Enforcing WCAG color contrast programmatically
WHAT IT TESTS: preventing failing color pairings by design. OUTLINE: pre-validate token pairs, expose only safe semantic combos, lint and test contrast in CI. RED FLAG: trusting developers to eyeball contrast manually.
Managing keyboard focus in an accessible Modal
WHAT IT TESTS: focus management for dialogs. OUTLINE: move focus in on open, trap Tab inside, close on Escape, restore focus to the trigger on close. RED FLAG: leaving focus behind the modal so Tab escapes to the page.
Minimizing library bundle-size impact on consumers
WHAT IT TESTS: controlling bundle cost at scale. OUTLINE: track size in CI with size-limit, support granular imports, externalize peers, lazy-load heavy parts, audit with bundle analyzers. RED FLAG: relying on tree-shaking alone with no measurement.
Building a visual regression testing pipeline
WHAT IT TESTS: scalable visual diffing. OUTLINE: snapshot Storybook stories per PR, freeze nondeterminism, set diff thresholds, manage baselines via approvals. RED FLAG: pixel-perfect diffs with no flake control or baseline workflow.
Syncing design tokens from Figma to code
WHAT IT TESTS: a tokens pipeline with a single source of truth. OUTLINE: export Figma variables to a token spec, transform with Style Dictionary into platform outputs, automate via CI. RED FLAG: manually copying hex values by hand.
Bundling a library for tree-shaking and multiple formats
WHAT IT TESTS: library-mode bundler config. OUTLINE: externalize peers, emit ESM and CJS, preserve modules for tree-shaking, set sideEffects false, ship types. RED FLAG: bundling peers or shipping a single minified CJS blob.
Releasing a breaking change without forcing upgrades
WHAT IT TESTS: managing breaking changes under semver. OUTLINE: ship a major bump, keep the old major published, document migration, automate with Changesets. RED FLAG: hiding a breaking change in a patch or force-upgrading everyone.
Monorepo vs polyrepo for a design system
WHAT IT TESTS: repo architecture trade-offs. OUTLINE: atomic cross-package changes and shared tooling versus build orchestration, caching, and versioning complexity. RED FLAG: blanket pro or anti stance ignoring release and CI implications.
CSS-in-JS vs pre-compiled CSS for distribution
WHAT IT TESTS: styling distribution trade-offs. OUTLINE: runtime cost and dynamic theming of CSS-in-JS versus cacheability and SSR simplicity of static CSS. RED FLAG: declaring one universally better with no mention of runtime or caching.
Storybook's role in design system infrastructure
WHAT IT TESTS: why a component explorer matters. OUTLINE: isolated development, living documentation, visual and interaction testing, shared review surface. RED FLAG: describing it only as a dev playground with no testing or docs value.
Publishing a component to a private NPM registry
WHAT IT TESTS: the packaging-to-publish workflow. OUTLINE: configure package.json fields and scoped name, build dist, set registry auth, npm publish with access restricted. RED FLAG: forgetting the build step or shipping raw source.
Measuring design system documentation effectiveness
WHAT IT TESTS: outcome metrics over vanity page views. OUTLINE: search-with-no-results, time-to-first-component, support-ticket deflection, tied to analytics and registry data. RED FLAG: citing only page views or NPS with no instrumentation.
Documenting component anti-patterns and don'ts
WHAT IT TESTS: guiding correct usage by showing failure modes. OUTLINE: paired do/don't examples, explain the why, enforce with lint rules. RED FLAG: vague prose warnings with no concrete counter-example or guardrail.
Auto-generating component API docs from source
WHAT IT TESTS: keeping prop docs in sync with code. OUTLINE: extract types via react-docgen-typescript, surface in Storybook ArgsTable, enrich with JSDoc. RED FLAG: maintaining a hand-written prop table that silently drifts.
Structuring Storybook stories for visual states
WHAT IT TESTS: organizing component documentation in an explorer. OUTLINE: one named story per state with explicit args, plus argTypes and controls. RED FLAG: dumping every state into one story with manual prop toggling.