CSS Variables Lesson - 39

CSS variables, also known as custom properties, are entities defined by CSS authors that contain specific values to be reused throughout a document. They are entities defined by CSS authors that contain specific values to be reused throughout a document. They are set using custom property notation (e.g., --variable-name: value;) and are accessed using the var() function.
Here's a breakdown of how CSS variables work:
Declaration and Syntax:
CSS variables are declared using a double hyphen (--) followed by a name and a value. The syntax looks like this:
element {
--variable-name: value;
}
For example:
:root {
--primary-color: #3498db;
}
.element {
color: var(--primary-color);
}
In this example, --primary-color is a CSS variable storing the color #3498db.
Scope:
CSS variables are scoped to the element on which they're defined or to the :root pseudo-class (which represents the highest-level parent element). When a variable is defined in the :root pseudo-class, it becomes a global variable accessible to all elements in the document.
Usage with var() function:
To use the value of a variable, you employ the var() function like this:
.element {
color: var(--primary-color);
}
In this case, the color property of .element is set to the value stored in --primary-color, which is #3498db according to the earlier declaration in the :root pseudo-class.
Benefits:
Maintainability: Variables make it easier to manage and update styles, especially in large projects, by centralizing values that are reused multiple times.
Reusability: Variables can be reused across different elements, making it easier to maintain a consistent design.
Dynamic Theming: Variables can be changed dynamically, allowing for easy theming and customization.
Responsive Design: Variables can adapt to different screen sizes or user preferences without changing the CSS rules directly.
In summary, CSS variables provide a way to store and reuse values in CSS, offering greater flexibility and maintainability in web development.

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