---
title: "The Scope of CSS @function – Master.dev Blog"
url: https://daily.dev/posts/the-scope-of-css-function-master-dev-blog-zq0o9lpmr
source_url: https://master.dev/blog/the-scope-of-css-function
type: article
source: "Frontend Masters"
published: 2026-06-16T18:24:03.184Z
updated: 2026-06-16T22:20:14.604Z
tags: ["css", "functional-programming"]
reading_time: 12
upvotes: 9
comments: 1
language: en
---

> ## Documentation Index
> Fetch the complete documentation index at: https://daily.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# The Scope of CSS @function – Master.dev Blog

**[Frontend Masters](https://daily.dev/sources/frontendmasters)** · 12 min read · 9 upvotes · 1 comments

## Summary

An advanced exploration of CSS @function evaluation scope — how custom CSS functions inherit variables from wherever they're called, not where they're defined. Covers portable evaluation scope patterns for building encapsulated CSS libraries, including partial application, function overloading via documentation tricks, and exposing user-extensible switch-board APIs. Real-world examples from the doubledash.css library demonstrate bitwise operations and CSS loops built entirely with these patterns.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://master.dev/blog/the-scope-of-css-function>

## Community discussion

Top comments from developers on daily.dev.

**@yaireo** · 0 upvotes

> I've created this year a collection of helpful CSS functions as a package: [https://github.com/yairEO/css-utility-functions](https://github.com/yairEO/css-utility-functions)

## Similar posts on daily.dev

- [Issue \#746: The scope superpower hiding in CSS @function — Frontend Focus](https://daily.dev/posts/issue-746-the-scope-superpower-hiding-in-css-function-frontend-focus-nyafjwmgw) · Frontend Focus · 10 upvotes · 0 comments
- [The Fundamentals and Dev Experience of CSS @function – Frontend Masters Blog](https://daily.dev/posts/the-fundamentals-and-dev-experience-of-css-function-frontend-masters-blog-21yo168d7) · Frontend Masters · 8 upvotes · 4 comments

---

Tags: [#css](https://daily.dev/tags/css), [#functional-programming](https://daily.dev/tags/functional-programming)

[View this post on daily.dev](https://daily.dev/posts/the-scope-of-css-function-master-dev-blog-zq0o9lpmr)