A web developer is implementing a theme switcher for their website using CSS variables. They need to ensure that the colors and font sizes adjust according to the user's preferences. What should they consider when implementing this feature?

  • Applying JavaScript to handle theme switching for better control over dynamic changes.
  • Ensuring proper usage of media queries to handle different user preferences.
  • Using fixed units for colors and font sizes to maintain consistency across all devices.
  • Utilizing CSS custom properties (variables) for defining colors and font sizes and ensuring proper fallbacks for browsers that do not support CSS variables.
When implementing a theme switcher with CSS variables, it's crucial to use CSS custom properties (variables) for defining colors and font sizes. This ensures flexibility and ease of maintenance. Proper fallbacks should be provided for browsers that don't support CSS variables.
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