Custom properties

Custom properties Css Questions

Master custom properties css interviews with our comprehensive collection of 3 questions and challenges.

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How does inheritance and cascading work with CSS variables, and how can you scope a variable to a component?

Understand where a custom property resolves, why inheritance makes subtree overrides work, and the patterns for scoping and exposing component tokens.

intermediatecsscustom-propertiesinheritance

How do CSS custom properties differ from Sass/Less variables?

Compare a build-time text substitution with a live, inherited, runtime value that JavaScript can read and change.

intermediatecsscustom-propertiessass

How would you build a theming system (light/dark mode) using CSS variables?

Design a full theming system: semantic tokens, prefers-color-scheme defaults, a manual override attribute, no-flash hydration, and color-scheme for native UI.

advancedcsscustom-propertiesdark-mode