Set up Master CSS in Webpack

Guide to setting up Master CSS in your Webpack project.

Master CSS Runtime Rendering observes changes in DOM class names at browser runtime, generates corresponding CSS rules, and injects them into the running style sheet.

Fixed style cost

All features work out of the box with ~16KB transfer cost

Fully automatic

Capture any program-generated class names

CSS lifecycle

CSS is generated on demand and frees memory when not in use

Quick start

Clone the example

Copy-paste the following commands to quickly start using the

You can skip all installation steps.

npx degit master-co/css/examples/webpack-with-runtime-rendering my-project
cd my-project
npm install @master/css@beta
npm install
npm run dev


Create a project

If you don't have a Webpack project, create one first. It's recommended to refer to Getting Started - Webpack

mkdir project
cd project
npm init -y
npm install webpack webpack-cli webpack-dev-server html-webpack-plugin --save-dev

Install Master CSS

Install Master CSS into your project via package managers.

npm install @master/css@beta

Initialize configuration file

Run npx mcss init to create a configuration file master.css.ts.

npx mcss init

Create a Webpack config file

Create and configure the webpack.config.js file.

const path = require('path')
const HtmlWebpackPlugin = require('html-webpack-plugin')
module.exports = {
entry: './src/index.js',
output: {
filename: 'bundle.js',
path: path.join(__dirname, 'dist')
plugins: [
new HtmlWebpackPlugin({
template: path.join(__dirname, '')
devServer: {
watchFiles: ['src/**/*']

Create a HTML file

Create and configure the src/index.html file.

<!doctype html>
<html lang="en" style="display: none">
<meta charset="utf-8" />
<script src="./index.js"></script>
<h1>Hello World</h1>

Set up CSS runtime engine

Create src/index.js file and import Master CSS into it.

import { initRuntime } from '@master/css';
import config from '../master.css.js';

Add scripts to package.json

Add start and build scripts to standardize the development process.

"scripts": {
"dev": "webpack serve --mode development",
"build": "webpack --mode production"

Launch server

Run the development server.

npm run dev

Hello world!

Now style your first element using Master CSS syntax!

<!doctype html>
<html lang="en" style="display: none">
<meta charset="utf-8" />
<script src="./index.js"></script>
<h1 class="font:40 font:heavy italic m:50 text:center">Hello World</h1>

Open your browser to watch the changes.


Hello World

MIT License © Aoyue Design LLC.