Science Knowings: CSS Course For Social Media

CSS Variables

CSS Variables: A New Way to Style Your Code

Last session, we talked about accessibility and copywriting. Today, we're diving into CSS Variables, a powerful new way to style your code.

What are CSS Variables?

CSS Variables (also known as Custom Properties) allow you to store and reuse values throughout your CSS code, making it easier to manage and maintain your styles.

Why Use CSS Variables?

There are several benefits to using CSS Variables:

  • Improved code maintainability: CSS Variables make it easier to find and change values throughout your code.
  • Reduced repetition: You can reuse values without duplicating code.
  • Increased flexibility: Easily change the look and feel of your site by changing the values of CSS Variables.

How to declare CSS Variables

To declare a CSS Variable, use the -- prefix, followed by the variable name. For example:

--primary-color: #ff0000;

Using CSS Variables in your code

Once you've declared a CSS Variable, you can use it anywhere in your CSS code using the var() function. For example:

body { background-color: var(--primary-color); }

Where to use CSS Variables

CSS Variables can be used to store any type of CSS property value, including colors, fonts, spacing, and more.

Best practices for using CSS Variables

  • Use meaningful variable names.
  • Group related variables together.
  • Use the var() function to access variables.
  • Don't overuse CSS Variables.

Browser support for CSS Variables

CSS Variables are supported in all major browsers, including Chrome, Firefox, Safari, and Edge.

Examples of CSS Variables in action

// Change the font size of all headings h1, h2, h3, h4, h5, h6 { font-size: var(--font-size); } // Change the background color of the body body { background-color: var(--body-bg-color); }

Advanced CSS Variables features

  • Variable inheritance: Variables are inherited by child elements.
  • Variable scoping: Variables can be scoped to specific parts of your code using the @scope rule.
  • Variable fallback: You can specify a fallback value for variables that are not supported in older browsers.

Limitations and caveats of CSS Variables

  • CSS Variables can be computationally expensive.
  • CSS Variables are not supported in IE11 and older browsers.
  • CSS Variables can be tricky to debug.

Next Up: CSS Feature Queries

In the next session, we'll explore CSS Feature Queries, a powerful tool for conditionally loading CSS styles depending on the browser's capabilities. Follow us on Instagram to stay updated!