ITCSS — Inverted Triangle CSS: Complete Architecture Guide

Author: Harry Roberts (csswizardry.com)
Founding article: https://www.creativebloq.com/web-design/manage-large-css-projects-itcss-101517528
Original talk (2014): https://www.youtube.com/watch?v=1OKZOV-iLj4
CSS Guidelines (extended reference): https://cssguidelin.es

1. What is ITCSS?

ITCSS (Inverted Triangle CSS) is a CSS architecture methodology developed by Harry Roberts to manage CSS projects at scale. It organises styles into layers of increasing specificity, eliminating cascade conflicts and making long-term maintenance straightforward.

The inverted triangle principle