W3Schools
w3schools.com › cssref › css_functions.php
CSS Functions Reference
CSS functions are typically used as values for various CSS properties. ... If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail: sales@w3schools.com · If you want to report an error, or ...
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › CSS › Reference › Values › Functions
CSS value functions - MDN Web Docs
5 days ago - CSS value functions are statements that invoke special data processing or calculations to return a CSS value for a CSS property. CSS value functions represent more complex data types and they may take some input arguments to calculate the return value.
Do CSS functions exist? - Stack Overflow
I'm not sure what to call this, but basically let's say I have a style that I use a lot, .somepattern{ font-size:16px; font-weight:bold; border:2px solid red; } but sometime I want to More on stackoverflow.com
What's the most beautifully built site you've ever seen?
https://stripe.com More on reddit.com
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365
November 16, 2016Why is css so terrible?
I really don't know what you're talking about :/ It has some quirks with browser support, but for the most part itsbjust descriptors that will work in 99% of cases.
Sounds to me like you've not spent much time learning it, and now are ranting about not understanding it. You could pretty much say this for any language.
More on reddit.com 39
54
June 23, 2015What CSS properties/concepts are the most useful in the real world
Flexbox and grid. https://flexboxfroggy.com/ https://codepip.com/games/grid-garden/ Bootstrap will not teach you CSS, aside from a few class they use. More on reddit.com
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January 7, 2022Videos
08:18
First look at FUNCTIONS in CSS!!! (it's a game changer) - YouTube
19:19
The CSS "function" proposal is WILD (I think I like it?) - YouTube
CSS Functions Tutorial for Beginners | min, max, clamp, minmax, ...
15 | CALC() & VAR() CSS FUNCTIONS | 2023 | Learn HTML and CSS Full ...
00:59
CSS Min/Max Functions Are Incredible - YouTube
CSS-Tricks
css-tricks.com › complete-guide-to-css-functions
CSS Functions Guide | CSS-Tricks
August 21, 2025 - This function allows you to specify a list of images for the browser to select for a background image, based on what it knows about the capabilities of its display and its connection speed. It is analogous to what you would do with the srcset property. ... This is a pseudo-element selector used to target elements that have been placed into a slot inside a HTML template.
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › CSS › CSS_Functions
CSS value functions - CSS: Cascading Style Sheets | MDN
February 13, 2025 - CSS value functions are statements that invoke special data processing or calculations to return a CSS value for a CSS property. CSS value functions represent more complex data types and they may take some input arguments to calculate the return value.
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › CSS › Reference › At-rules › @function
function - CSS - MDN Web Docs - Mozilla
January 6, 2026 - The @function CSS at-rule enables defining CSS custom functions. Once defined, a custom function can be called using the syntax (for example, --my-function(30px, 3)) within any property value.
web.dev
web.dev › learn › css › functions
Functions - CSS
June 6, 2025 - Functions like attr() and url() follow a similar structure to var()— you pass one or more arguments and use them on the right side of your CSS declaration. ... The attr() function here is taking the content of the <a> element's href attribute and setting it as the content of the ::after pseudo-element. If the value of the <a> element's href attribute was to change, this would automatically be reflected in this content attribute.
Quackit
quackit.com › css › functions
CSS Functions
Alphabetical list of CSS functions included in CSS3. ... CSS functions are used as a value for various CSS properties. For example, you can use the rgb() function to provide a color value (such as color: rgb(255, 0, 215)), or the attr() function to retrieve the value of an HTML attribute.
The Odin Project
theodinproject.com › lessons › node-path-intermediate-html-and-css-css-functions
CSS Functions | The Odin Project
Similar to programming languages, functions in CSS are reusable pieces of code which perform specific tasks. Functions are passed “arguments” between parentheses, each of which is used by the function in a specific way.
GeeksforGeeks
geeksforgeeks.org › css › css-functions-complete-reference
CSS Functions Complete Reference - GeeksforGeeks
July 12, 2025 - CSS functions are used to dynamically define or manipulate property values in stylesheets, making designs more flexible and responsive. Retrieve values like attributes with attr() or calculate sizes with calc(). Adjust colors using functions ...
CSS-Tricks
css-tricks.com › functions-in-css
Functions in CSS?! | CSS-Tricks
March 3, 2025 - Functions can have type-checking for arguments and return values, which will be useful whenever we want to interpolate a value just like we do with variables created with @property, and once we have inline conditionals, to make different ...
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › CSS › CSS_Values_and_Units › CSS_Value_Functions
CSS value functions - MDN - Mozilla
October 8, 2025 - CSS value functions are statements that invoke special data processing or calculations to return a CSS value for a CSS property. CSS value functions represent more complex data types and they may take some input arguments to calculate the return value.
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › CSS › Guides › Custom_functions_and_mixins › Using_custom_functions
Using CSS custom functions - CSS | MDN
CSS custom functions enable you to create reusable blocks of CSS code that can accept arguments, contain complex logic (defined using features such as CSS if() functions and @media at-rules), and return values based on that logic. They work similarly to CSS custom properties, but provide more ...
jQuery
api.jquery.com › css
.css() | jQuery API Documentation
As of jQuery 1.6, .css() accepts relative values similar to .animate(). Relative values are a string starting with += or -= to increment or decrement the current value. For example, if an element's padding-left was 10px, .css( "padding-left", "+=15" ) would result in a total padding-left of 25px. As of jQuery 1.4, .css() allows us to pass a function as the property value:
Una
una.im › 5-css-functions
una.im | 5 Useful CSS functions using the new @function rule
August 13, 2025 - So I wrote a function here to create fluid typography that scales with the viewport width, but also has minimum and maximum size limits. It also provides some options to scale your fonts at different rates. I want headers, for example, to scale faster than copy, so I’m using a 4vw value to size my headers (also the default value), and 0.5vw to size copy. This is shown in the form of a third, optional argument, which takes advantage of CSS if() to make a determination based on the input value.
Medium
medium.com › @stheodorejohn › 20-css-functions-unleashing-design-creativity-and-responsiveness-37a1bc664a88
20 CSS Functions — Unleashing Design Creativity and Responsiveness | by Theodore John.S | Medium
September 21, 2023 - In this comprehensive guide, we’ll embark on a journey through 20 essential CSS functions, exploring their capabilities, real-world applications, best practices, and common pitfalls. ... The rgba() function empowers you to define colors with precision, including alpha (transparency) values. It's perfect for creating translucent or semi-transparent colors. ... Passionate self-taught front-end dev. HTML, CSS, JS, React | Creating pixel-perfect web experiences |
Chrome Developers
developer.chrome.com › blog › css conditionals with the new if() function
CSS conditionals with the new if() function | Blog | Chrome for Developers
July 1, 2025 - if() enables a cleaner developer interface for dynamic styles like style queries and media queries, with some key differences, which you can learn about in this post. The CSS if() function works using a series of condition-value pairs, structured as follows:
The Knowledge Academy
theknowledgeacademy.com › blog › css-functions
CSS Functions: Enhance Your Styling Capabilities
September 9, 2025 - Replace .element with the appropriate selector for your target HTML element. Most CSS Functions accept parameters to control the appearance and behaviour of the styling effect. Fine-tune these parameters to achieve the desired outcome. Parameters for CSS Functions can include colours, sizes, durations, and timing functions, among others.
LinkedIn
linkedin.com › pulse › css-functions-comprehensive-guide-examples-abhishek-garg-
CSS Functions: A Comprehensive Guide with Examples
February 8, 2023 - CSS functions are expressions that perform specific operations and return a value. They provide a way to manipulate values in CSS, making it possible to write complex and dynamic styles.
Top answer 1 of 10
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I know I'm late to the party but the selected answer IS NOT the right answer since it's deferring it to CSS preprocessors.
To answer the specific question "Do CSS functions exist?", the answer is: Yes.
However, CSS functions work completely different than the OP's concept initially is.
cuixiping's answer seems the most correct answer.
Examples of CSS functions are:
url()attr()calc()rotate()scale()linear-gradient()sepia()grayscale()translate()
A detailed, comprehensive list can be found here:
CSS functions on MDN Updated link 18/9/20
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You can't programatically control CSS from your markup, but you can use one of the many CSS extensions to make CSS work more like a compiled language.
http://lesscss.org/
http://sass-lang.com/
If we wrote your example in LESS, we'd get something like this:
.somepattern(@color: red, @size: 16px) {
font-size:@size;
font-weight:bold;
border:2px solid @color;
}
And then you could use it in your LESS file like so:
.myclass {
.somepattern(green, 20px);
}