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CSS style guides maintained by companies

Style guides written and maintained by top tech companies


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Airbnb

A mostly reasonable approach to CSS and Sass

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Dropbox

Dropbox’s (S)CSS authoring style guide

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WordPress

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

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Google

This document defines formatting and style rules for HTML and CSS

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Bootstrap

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

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ThinkUp

This is the Code Style guide for CSS

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Workable

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

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CodePen

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