With thousands of engineers working across a range of products at Facebook, we face some unique challenges when it comes to code quality. Not only are we dealing with a large codebase, but things are also moving fast — new features are being added, existing ones are being improved, and things are being reorganized. For CSS, this means having thousands of files that are in a continuous state of flu
![Improving CSS quality at Facebook and beyond](https://cdn-ak-scissors.b.st-hatena.com/image/square/340b02be07b7596c571f0fffb5f7e9c54832e835/height=288;version=1;width=512/https%3A%2F%2Fengineering.fb.com%2Fwp-content%2Fuploads%2F2016%2F06%2FEng_LightNavy-1.jpg)