HTML, CSS, and JavaScript are the three core technologies that make websites function and look the way they do. HTML provides the structure and content—the text, images, and elements that appear on a page. CSS handles the visual presentation, controlling colors, layouts, spacing, and how things look across different screen sizes. JavaScript adds interactivity, letting pages respond when you click buttons, fill out forms, or scroll. Understanding how these three work together helps you see why websites behave the way they do and what's happening behind the scenes.
These articles explain what each technology does on its own, how they communicate with each other, and why developers use them in specific ways. You'll learn how changes in one layer affect the others, what happens when JavaScript modifies HTML or CSS, and how to recognize which technology is responsible for different parts of a website's behavior.