What are dynamic CSS variables and how do I use them?

What are dynamic CSS variables and how do I use them?

Dynamic CSS variables, also known as CSS custom properties, allow you to store values in a variable format that can be reused throughout your stylesheets. You can change these values dynamically with JavaScript, making your styles more flexible.

Can you give me an example of how to define and use them?

Sure! You can define a dynamic CSS variable in your CSS like this: --main-color: blue;. Then, you can use it in your styles: color: var(--main-color);. To change it dynamically, you can use JavaScript: document.documentElement.style.setProperty('--main-color', 'red');.

What browsers support dynamic CSS variables?

Most modern browsers support dynamic CSS variables, including Chrome, Firefox, Safari, and Edge. However, it's always good to check compatibility for older versions.

Are there any performance concerns with using them?

Generally, dynamic CSS variables are efficient, but excessive use in large applications can lead to performance issues. It's best to use them judiciously.