Interview Questions
Main approaches include: CSS Modules, Styled Components, CSS-in-JS libraries, traditional CSS/SASS, Tailwind CSS, and inline styles. Each approach has different benefits for scoping, maintainability, and performance.
CSS Modules are CSS files where all class names are scoped locally by default. They solve naming conflicts, provide better encapsulation, and enable modular styling. Each component gets unique class names through compilation.
CSS-in-JS is writing CSS code within JavaScript. Advantages include dynamic styling, scoped styles, no global namespace pollution, and better integration with component state. Popular libraries include styled-components and emotion.
Implement theming using CSS variables, styled-components ThemeProvider, or context API. Handle theme switching, maintain consistency, and consider dark mode support. Manage theme variables and inheritance.
Styled Components is a CSS-in-JS library that allows writing actual CSS in JavaScript. Components are created with styles attached, supporting props-based styling, theming, and dynamic styles. Styles are scoped to components.
Use media queries, CSS Grid/Flexbox, responsive units (rem/em), CSS modules for breakpoints, or styled-components media templates. Consider mobile-first approach and component-based responsiveness.
CSS-in-JS can impact runtime performance, CSS Modules have build-time overhead, inline styles prevent browser optimizations. Consider bundle size, runtime performance, and caching strategies.
Use CSS transitions/animations, React Transition Group, Framer Motion, or CSS-in-JS animation props. Consider performance, accessibility, and reduced motion preferences.
Tailwind CSS is a utility-first CSS framework. Integrates through PostCSS, provides utility classes for styling, supports component composition. Requires proper configuration and purging for production.
Use template literals, classnames library, CSS modules composition, or styled-components props. Handle dynamic classes and inline styles based on props or state.
Follow component-based organization, maintain consistent naming conventions, use proper file structure, implement style guide. Consider scalability and maintainability.
Use proper type definitions for styled components, implement theme typing, handle prop types for styled components. Consider type safety and proper inference.
Override styles using CSS specificity, use component APIs for customization, implement wrapper components with custom styles. Consider maintainability and upgrades.
Use global CSS files, styled-components createGlobalStyle, CSS custom properties. Handle reset styles, typography, and theme variables. Consider scope and maintainability.
Implement variant props, use style composition, create style maps/objects. Handle multiple variations and combinations effectively.
Use CSS Modules for scoping, implement proper class naming conventions, manage specificity hierarchy. Consider cascade and inheritance implications.
Implement responsive grid layouts, use grid areas for component placement, handle dynamic grid structures. Consider fallbacks and browser support.
Use CSS logical properties, implement directional styles, handle bidirectional text properly. Consider cultural differences and layout implications.
Implement consistent form styles, handle input states, manage validation styles. Consider accessibility and user feedback.
Implement page transition animations, handle route-based styles, manage transition states. Consider performance and user experience.
Use style props for component customization, implement consistent prop interfaces, handle style composition. Consider type safety and documentation.
Implement critical CSS, handle code splitting, optimize load performance. Consider caching strategies and resource hints.
Handle style extraction, implement proper hydration, manage style injection. Consider performance and flash of unstyled content.
Use CSS variables for dynamic styling, handle theme changes, implement fallbacks. Consider browser support and performance.
Implement progressive enhancement, use appropriate breakpoints, handle touch interactions. Consider device capabilities and constraints.
Implement data-driven styles, handle dynamic classes and properties, manage style updates. Consider performance and maintainability.
Define and manage design tokens, implement token-based styling system, handle theme variations. Consider maintainability and consistency.
Use CSS transitions for subtle animations, implement hover/focus states, handle interaction feedback. Consider performance and accessibility.
Test style rendering, verify theme integration, check dynamic styles. Consider snapshot testing and visual regression testing.