A software developer from San Francisco managed to do what no one else did before, creating a fully-functional two-way chat using only CSS and HTML, completely ditching JavaScript in the process.

CSS (Cascading Style Sheets) is a programming language that works with HTML to shape how information appears on a webpage. In other words, HTML is the building materials, and CSS is the design layout.

Inline vs external styles Furthermore, all HTML5 tags have a style property that one can use to override any style information defined at either the page style level or in an external style sheet.