Lecture 107:- CSS Variables

CSS variables, also known as custom properties, allow developers to define reusable values in CSS that can be used throughout a stylesheet. These variables are defined using the -- prefix, followed by a name and value. For example:

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:root {  --primary-color: #007bff;  --secondary-color: #6c757d; }

In this example, --primary-color and --secondary-color are defined as CSS variables with their respective color values. These variables can then be used in the stylesheet wherever those colors are needed, like so:

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button {  background-color: var(--primary-color);  color: var(--secondary-color); }

In addition to simplifying the process of defining and reusing values, CSS variables also offer some other benefits:

1. Dynamic updates: Because CSS variables are defined in the stylesheet, they can be updated dynamically using JavaScript. This makes it easy to create interactive designs that can respond to user actions or other events.
2. Cascading: CSS variables are subject to the same cascading rules as other CSS properties. This means that they can be overridden by more specific selectors or later rules, making it easy to create different themes or variations of a design.
3. Browser support: CSS variables are supported in most modern browsers, including Chrome, Firefox, Safari, and Edge. However, older browsers like IE11 do not support them.

Overall, CSS variables can help simplify the process of creating and maintaining CSS code, and offer a more flexible and dynamic approach to defining values in a stylesheet.