In web development, typically refers to one of two things: a commonly used filename for an external CSS stylesheet or a stylesheet generated by the Stylus preprocessor. 1. The Standard "styl.css" External Stylesheet

: Instead of writing styles directly inside HTML tags, you place them in this separate file to keep your code clean and reusable.

Developers often name their external CSS files style.css or styles.css . However, styl.css is a frequent variation used to link visual instructions to an HTML document.