What are the performance implications of using CSS variables?

What are the performance implications of using CSS variables?

CSS variables, or custom properties, can improve performance by reducing redundancy in your stylesheets. However, excessive use can lead to increased reflows and repaints in the browser.

Can you explain how they affect rendering performance?

When CSS variables are used, the browser needs to resolve these variables during rendering. If a variable changes, it can trigger a reflow, which may impact performance, especially in complex layouts.

Are there any best practices to minimize performance issues?

Yes! Limit the use of CSS variables in frequently changing styles, and consider using them for static values or themes to minimize reflows.

What about browser compatibility?

CSS variables are widely supported in modern browsers, but you should check compatibility for older versions if your audience uses them.