MDN Web Docs
developer.mozilla.org › en-US › docs › Web › CSS › Guides › Cascading_variables › Using_custom_properties
Using CSS custom properties (variables) - CSS | MDN
Custom properties (sometimes referred to as CSS variables or cascading variables) are entities defined by CSS authors that represent specific values to be reused throughout a document. They are set using the @property at-rule or by custom property syntax (e.g., --primary-color: blue;). Custom ...
W3Schools
w3schools.com › css › css3_variables.asp
CSS Variables - The var() function
The var() function is used to insert the value of a CSS variable.
What are the must have CSS Variables?
State variables. Stuff like: a, button, input { --hov: 0 } :is(s, button, input):is(:hover, :focus) { --hov: 1 } Then --hov can be used to adjust any property (background, color, box-shadow, transform). Or for theme switching: body { --dark: 0; /* setting the theme to auto */ @media (prefers-color-scheme: dark) { &:has([data-mode='auto'][aria-pressed='true']) { --dark: 1 } } /* setting the theme to dark */ &:has([data-mode='dark'][aria-pressed='true']) { --dark: 1 } } Then --dark can be used to switch background, color (and more) using color-mix(). --perc: calc(var(--dark)*100%); background: color-mix(in srgb, #111 var(--perc), #eee); color: color-mix(in srgb, #eee var(--perc), #111); Or for switching between wide narrow states using media/ container queries. Above a certain wiewport/ container width, --wide is 1, below it's 0. Then --wide can get used to set grid-template, grid-area values and more. More on reddit.com
13
11
April 7, 2025Am I the only one who thinks that the use of custom-properties worsens the readability of css code?
One example where custom properties really shine is if your web app follows a design system. You want to have single source of truth for all of the design tokens (colors, spacings, fonts, etc.), so that when something inevetably changes, you don't have to change that in 100 places but just 1. How would you handle that without custom properties? Custom properties (also known as css variables) are used when you want to share a value between multiple properties. I personally find them completely readable and very useful if used correctly. More on reddit.com
53
0
September 6, 2024CSS Variables Guide - Syntax sucks, but there're cool things you can achieve with these
What's wrong with the syntax? I think it's just fine
More on reddit.com 3
8
April 20, 2018CSS Variables
Woud i be stupid to start learning it
Absolutely not! It's always worth learning something new, and it's a pretty straight forward topic.
why most people use preprocessors for CSS
I can't speak for everybody of course, but my workplace uses Sass and PostCSS so I can explain our reasoning.
The simplest answer would be that css variables aren't supported by IE11 which is the oldest browser we support. This reflects the user base of our clients (and we're quite fortunate to only support IE11, a lot of developers have to take even older versions into account). If you don't need to support IE then by all means use CSS variables.
However Sass includes a lot more functionality than just variables. Mixins and nesting, as well as its built-in functions, help with reusability and structuring. These are important considerations in large projects. There are proposals for similar functionality in CSS but they're not in place yet. Once these are ready and widely adopted by browsers then we'll probably stop using Sass.
More on reddit.com 7
3
February 21, 2018What Are Best Practices for Using CSS Variables?
When using CSS variables, follow best practices to ensure maintainability and cross-browser compatibility. Always define global variables in the :root, use descriptive names for variables, and provide fallbacks for unsupported browsers. When managing large projects, organizing variables into categories such as colors, typography, and spacing can make your code more readable and efficient.
d-libro.com
d-libro.com › html & css coding with ai › css variable: creating css custom properties
Master CSS Variables: Custom Properties & Best Practices - Topic
How Do CSS Variables Simplify Stylesheet Management?
The key advantage of CSS variables is their ability to simplify and streamline your stylesheets. By using variables, you avoid the need to manually update multiple instances of the same value. Additionally, CSS variables make it easier to implement theming and respond to design changes efficiently. Custom properties also support inheritance, meaning they can be used and redefined within child elements for more complex designs.
d-libro.com
d-libro.com › html & css coding with ai › css variable: creating css custom properties
Master CSS Variables: Custom Properties & Best Practices - Topic
What Is the Basic Syntax for Defining CSS Variables?
CSS variables are defined within the :root or any specific element in your stylesheet, making them globally or locally accessible. For example:
:root {
--main-color: #3498db;
--font-size: 16px;
}
body {
color: var(--main-color);
font-size: var(--font-size);
}
This example defines two CSS variables, --main-color and --font-size, which are applied to the body element. The var() function is used to reference the variables within your styles.
d-libro.com
d-libro.com › html & css coding with ai › css variable: creating css custom properties
Master CSS Variables: Custom Properties & Best Practices - Topic
Videos
11:14
How to use CSS variables like a pro | Tutorial - YouTube
30:57
Introduction to CSS variables (CSS custom properties) [full tutorial] ...
07:20
Learn CSS Variables In 7 Minutes - YouTube
04:56
How to write a CSS variable (CSS custom property) - YouTube
16:59
The Ultimate Guide to CSS Variables - YouTube
07:48
The CSS Variables Trick You’ll Wish You Knew Sooner - YouTube
Hyperskill
hyperskill.org › university › frontend › css-variables
CSS Variables
October 3, 2024 - CSS variables, also known as custom properties, allow developers to define reusable values in a stylesheet. Unlike fixed-value CSS properties, CSS variables can be dynamically used throughout the stylesheet, making code maintenance easier and design more consistent.
Medium
blog.yipl.com.np › understanding-css-variables-74fdb6e7ef54
Understanding CSS Variables
November 14, 2018 - CSS variables, or “CSS Custom Properties”. It allows you to work with variables directly in CSS. They are very useful for reducing repetition in CSS, and also for powerful runtime effects like theme switching and has a various polyfilling ...
Medium
medium.com › @aicontentpace › css-variables-in-depth-guide-31b814d71ec6
CSS Variables In-depth Guide | by Defita F. C. P | Medium
July 23, 2024 - CSS variables, also known as CSS custom properties, are entities defined by CSS authors that contain specific values to be reused throughout a web document. They are a powerful tool that can simplify the management of styles and facilitate ...
Medium
brandonblankenstein.medium.com › var-css-f2a51570101b
var( — css);. CSS-Variables | by Brandon Blankenstein | Medium
December 9, 2020 - Using CSS Variables allows you to set a variable name and have it define a specific value. An advantage of using variable throughout your css allows you to change the definition of a variable if you decide that you want it to be something different later on.
Medium
medium.com › dev-channel › css-variables-no-really-76f8c91bd34e
CSS Variables — No, really!. An update to an important CSS feature | by Dave Gash | Dev Channel | Medium
September 12, 2017 - The value of variables (see what I did there?) is this: set it once and it’s set everywhere; change it once and it’s changed everywhere. ... CSS variables are properly called “custom properties”, and that’s a fair description.
D-libro
d-libro.com › html & css coding with ai › css variable: creating css custom properties
Master CSS Variables: Custom Properties & Best Practices - Topic
December 3, 2024 - CSS variables, or custom properties, are a way to assign values to a property once and reuse that value across your stylesheet. This can significantly reduce redundancy in your CSS and make it easier to maintain a consistent design.
Codú
codu.co › niall › getting-started-with-css-variables-ejqv3eor
Getting Started with CSS Variables | by Niall Maher | Codú
Did you know that instead of having static values, you can use variables to make your styles dynamic? Enter CSS Variables or, as they're formally known, CSS Custom Properties.
web.dev
web.dev › blog › @property: next-gen css variables now with universal browser support
@property: Next-gen CSS variables now with universal ...
July 12, 2024 - The @property rule, part of the CSS Houdini umbrella of APIs, is now fully supported across all modern browsers. This game-changing feature unlocks new levels of control and flexibility for CSS custom properties (also known as CSS variables), making your stylesheets smarter and more dynamic.
DEV Community
dev.to › waelhabbal › harnessing-the-power-of-css-custom-properties-css-variables-396e
Harnessing the Power of CSS Custom Properties (CSS Variables) - DEV Community
February 20, 2024 - Introduction: CSS Custom Properties, also known as CSS Variables, have revolutionized the way we style and maintain our CSS code. They provide a way to store and reuse values throughout our stylesheets, offering greater flexibility, modularity, ...
Epic React
epicreact.dev › css-variables
Use CSS Variables instead of React Context | Epic React by Kent C. Dodds
July 9, 2024 - Turning to the CSS Variables approach, you'll notice the only component that re-rendered was our ThemeToggler component responsible for updating the body. And yet the user experience works perfectly! This is the magic behind CSS variables. With the ThemeProvider approach, we have to update the styles of every component, and then the browser paints those updates.
Ionic Framework
ionicframework.com › docs › theming › css-variables
CSS Variables | CSS Custom Properties for Variables & Components
Ionic components are built with CSS Variables for easy customization of an application. CSS variables allow a value to be stored in one place, then referenced in multiple other places. They also make it possible to change CSS dynamically at runtime (which previously required a CSS preprocessor).
MadCap Software
help.madcapsoftware.com › contributor9r3 › Content › Contributor › Styles › CSS-Variables › CSS-Variables.htm
CSS Variables
A CSS variable lets you place the value for a style in one place and reuse it throughout a stylesheet. As with other kinds of single-sourcing, this can help with speed, ease of use, and consistency. Whenever you want to change the value, you only need to do so in one place and the new value ...
Josh W. Comeau
joshwcomeau.com › css › css-variables-for-react-devs
How to use CSS variables with React • Josh W. Comeau
April 13, 2020 - In this example, we're defining a new variable, --highlight-color, on the paragraph selector. We're using that color to apply a background color to child <em> elements. Whenever an <em> is used within a paragraph, it'll have a yellow background. Notice how we define our CSS variables in the same way that we define typical CSS properties.
Aaron-gustafson
aaron-gustafson.com › notebook › css-variables-are-a-bad-idea
CSS Variables are a Bad Idea :: Aaron Gustafson
November 4, 2014 - Preprocessors already give us this access to variables today (along with nesting, mixins, and programmatic structures like conditionals, loops, etc.). Here’s a SASS example: $foreground-color: #333; $background-color: #fff; body { background: $background-color; color: $foreground-color; } The big difference here is that this document is a source file, it is not what is sent to the browser. This file is compiled by the preprocessor into actual CSS, which is what we send to the browser and is exactly what we wanted in the first place:
Increment
increment.com › frontend › a-users-guide-to-css-variables
A user’s guide to CSS variables – Increment: Frontend
May 21, 2020 - CSS variables are custom properties that cascade normally and even inherit. They start with a reserved -- prefix, and there are no real rules about their value. (Anything goes, even white space.)
DEV Community
dev.to › turpp › css-variables-1o8a
--css variables - DEV Community
September 5, 2021 - CSS variables are a way for you to assign certain css values to a keyword and reuse them throughout your application. CSS variables can have local or global scope and can be manipulated with JavaScript.
Koladechris
koladechris.com › blog › the-css-var-function-how-to-create-and-use-css-variables
The CSS var() Function – How to Create and Use CSS Variables
December 28, 2022 - The var() function is what allows you to reuse a CSS variable in your stylesheet. All you have to do is type out your property and put the name of the variable inside the var() function. The syntax looks like this: ... Remember we declare some global and local CSS variables previously, let’s see how to reuse them now.
CodeWithHarry
codewithharry.com › tutorial › css-variables
Variables | CSS Tutorial | CodeWithHarry
CSS Variables (also called custom properties) let you store values (like colors, font sizes, margins) in one place and reuse them throughout your stylesheet.