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07 · The building blocks

HTML, CSS, and JavaScript

These three languages work together to create most of what people see and use on a webpage.

Plain meaning

HTML is the structure, CSS is the appearance, and JavaScript is the behavior.

Think of a house

  1. HTML: The walls, rooms, doors, and labels.
  2. CSS: The paint, furniture, spacing, and lighting.
  3. JavaScript: The switches, elevators, alarms, and interactive parts.

What this means in practice

A heading and paragraph are HTML. The font, color, and layout are CSS. A menu that opens, a form that validates, or a button that changes something uses JavaScript.

Next step

Start with clean HTML and clear content. Add CSS to make it comfortable. Add JavaScript only when the page needs behavior that HTML and CSS cannot provide.