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Roll out a design system color change
Update the token source, rebuild outputs, version and publish, bump the app's dependency, verify contrast and visual regressions.
Accessibility built into a Modal component
Trap focus in the modal, return focus on close, escape to dismiss, role dialog with aria-modal and a labelled title, inert background.
Support a one-off that deviates from the system
Offer sanctioned escape hatches like custom-property overrides, scope the one-off to the app not the library, track it for promotion or removal.
Versioning a design system library
Monolithic versioning is simple and coherent but couples unrelated changes; independent versioning gives granular upgrades but adds tooling complexity.
Architect themes on a token foundation
Separate primitive tokens from semantic alias tokens that themes redefine, emit semantics as custom properties per theme scope, components use only semantics.
Light and dark themes with design tokens
A shared primitives file plus per-theme semantic files, transformed into custom properties scoped by selector, components read the semantics.
Token architecture for white-label multi-brand
A shared semantic schema, per-brand primitive and mapping overrides, a build step emitting one bundle per brand, components consume stable semantic names.
Modeling responsive design tokens
Model a token as a breakpoint-to-value map, transform into a base custom property redefined in media queries, components use one var per viewport.
Integrating design tokens with Tailwind CSS
Feed tokens into Tailwind's theme config (or v4 CSS theme) so utilities derive from one source; a parallel setup causes drift.
Reusable Button with hover, focus, disabled
Use a real <button>, style :hover, a visible :focus-visible ring, and the [disabled] attribute that also blocks interaction.
Designing a Card component API
Simple props for title and image, but children or slots for arbitrary content instead of a string prop, keeping it composable.
Customize a Button without !important
Expose CSS custom properties as a styling API, accept className or style overrides, keep internal selectors low specificity so overrides win cleanly.
Accessible composite TextField component
Associate label and input via matching for and id, generate a unique id, spread remaining props onto the native input.
CSS Modules versus Styled Components
CSS Modules scope via build-time hashed class names with near-zero runtime; Styled Components scope via runtime CSS-in-JS with easy dynamics but a runtime cost.
Controlled vs uncontrolled Modal component
Uncontrolled is convenient but inflexible, controlled gives parent full power and predictability, and a hybrid supports both.
The polymorphic 'as' prop pattern
Render the element from an as prop, infer props from the chosen element, and forward refs.
Shadow DOM encapsulation vs CSS Modules
Shadow DOM creates a separate tree blocking selectors both ways, CSS Modules only rename classes, and global styles need explicit bridges.
Associating a label with a form input
Explicit association via for and id, implicit by wrapping the input, and why this gives screen readers an accessible name and larger click target.
Managing focus in an accessible modal dialog
Move focus in on open, trap Tab within the dialog, close on Escape, and restore focus to the trigger on close.
ARIA roles for an accessible tab interface
Tablist contains tabs, each tab uses aria-selected and aria-controls, panels use role tabpanel with aria-labelledby, and arrow keys move between tabs.