CSS Feature Support Checker

Test CSS feature support on any browser - smart TVs, embedded devices, and non-standard environments.

Custom Properties

CSS custom properties (variables) and functions for dynamic styling.

  • ⏳ CSS Custom Properties (Variables)

    Define and use custom CSS variables with -- prefix.

    --custom: redMDN
  • ⏳ var()

    Reference custom properties using the var() function.

    color: var(--custom)MDN