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CSS style guides maintained by companies

Style guides written and maintained by top tech companies


Airbnb

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github.com

A mostly reasonable approach to CSS and Sass

Dropbox

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github.com

Dropbox’s (S)CSS authoring style guide

WordPress

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make.wordpress.org

A baseline for collaboration and review within various aspects of the WordPress open source project and community

Google

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google.github.io

This document defines formatting and style rules for HTML and CSS

Bootstrap

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codeguide.co

Standards for developing consistent, flexible, and sustainable HTML and CSS.

ThinkUp

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github.com

This is the Code Style guide for CSS

Workable

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github.com

This is the coding style guide we use for writing CSS & Sass in Workable.

CodePen

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codepen.io

Inspired by Mark Otto's tour of GitHub's CSS and Ian Feather's tour of Lonely Planet's CSS