CSS Custom Properties
CSS Custom Properties, commonly known as CSS Variables, are a feature in CSS that allows developers to define reusable values in a stylesheet, which can be referenced and manipulated throughout the document. They enable dynamic theming, easier maintenance, and enhanced flexibility by storing values like colors, fonts, or sizes in named variables. This feature is part of the CSS specification and is supported in modern browsers.
Developers should learn CSS Custom Properties to create more maintainable and scalable stylesheets, especially for large projects or design systems where consistent theming is crucial. They are ideal for implementing dark/light mode switches, responsive design adjustments, or dynamic UI changes without duplicating code. Using CSS Variables reduces redundancy, simplifies updates, and allows for real-time value changes via JavaScript.