Beginner

HTML & CSS Web Development: The Big Picture

HTML, CSS, and JavaScript are the three foundational technologies of the web, and understanding how they fit into the broader picture of the internet and the World Wide Web is essential c...

HTML, CSS, and JavaScript are the main technologies that make up the web as we know it. Every web page you visit contains HTML, CSS, and JavaScript. Understanding what these technologies are, where they came from, and where they are going is vital for anyone building for the web. This document provides a big-picture overview of why you should care about how the web works, how HTML displays content, how CSS styles it, and how JavaScript makes it interactive — along with an overview of the wider web development ecosystem, tooling, and career paths.

This module covers the technologies and versions used throughout this document: HTML5, CSS3 and beyond, and JavaScript as specified by ECMAScript 2022. To understand why you need to know how the web works, it helps to first look at where the web came from, then at how it works on a high level, and finally at why HTML, CSS, and JavaScript specifically matter.

The history of the internet and the web is action-packed. The following are the most significant events.

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What's inside

7 sections
  1. 1 Table of Contents
  2. 2 Module 1: Why You Should Care About How the Web Works
  3. 3 Module 2: Displaying the Web with HTML
  4. 4 Module 3: Styling the Web with CSS
  5. 5 Module 4: Interacting with the Web with JavaScript
  6. 6 Module 5: Where to Go from Here
  7. 7 Summary

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