CSS1 Specification Published
Before CSS, if you wanted to make text red, you used <font color='red'> inside your HTML. Every page was a mess of inline styles. HΓ₯kon Wium Lie and Bert Bos propose a radical idea: what if the look of a page was separate from its content? The W3C publishes CSS1 on December 17, 1996. It's buggy. Browser support is terrible. Netscape ignores it. But the idea is revolutionary. Separation of concerns. Content in HTML. Presentation in CSS. This changes everything.
CSS separated content from presentation, enabling responsive design, accessibility, and the modern web. It remains the foundation of web styling today.