- frontend-guidelines: Some HTML, CSS and JS best practices.
- Google Style Guide: Google HTML/CSS Style Guide
- code-guide: Standards for flexible, durable, and sustainable HTML and CSS.
- Github: The CSS toolkit and guidelines that power GitHub.
- Scooter: SCSS framework built to provide base styles, CSS components, and rapid static prototyping for Dropbox.
- Mailchimp: Mailchimp front-end framework
- Airbnb: Airbnb CSS / Sass Styleguide
- SalesForce: Lightning Design System
- Trello: Trello CSS Style Guide
- Evernote: Evernote CSS Style Guide
- Dropbox: Dropbox CSS Style Guide
- Buffer: The Buffer Style Guide
- bc-style-guide - Nicolás: CSS: The Good Parts
- MaintainableCSS: MaintainableCSS is an approach to writing modular, scalable and of course, maintainable CSS.
- idiomatic.css: Principles of writing consistent, idiomatic CSS.
- CSS Bliss: A CSS style guide that puts the Clean, Smart, and Simple back into CSS
- Yelp: This styleguide covers mixins for lots of CSS3 features as well as flexbox, animations and grids
- Workable: How we do CSS/Sass at Workable
- Mapbox: Css and styling
- Airbnb: JavaScript Style Guide
- idiomatic.js: Principles of Writing Consistent, Idiomatic JavaScript
- Angular Style Guide: A starting point for Angular development teams to provide consistency through good practices.
- Angular styleguide: Angular styleguide for teams
- A JavaScript Quality Guide - Nicolás: A quality conscious and organic JavaScript quality guide
- Jstips: This is about one JS tip every day!