Web Development Foundations

Lesson Promise

By the end of this lesson, you will understand how every web page loads — from the moment you type a URL to the moment pixels appear on your screen. You will also know the three layers (HTML, CSS, JavaScript) and when to use GET vs POST.

Narration Draft

"Every web page starts as a simple exchange: your browser sends a request, a server sends back a response. But between that request and the pixels on your screen, a lot happens: DNS resolution, TCP connection, TLS encryption, HTTP parsing, DOM construction, style calculation, layout, and painting. Understanding this flow is the foundation of all web development."

Visual Sequence

1. Scene 1 — Animated diagram of the web request lifecycle (Diagram: web-request-lifecycle)
2. Scene 2 — Split-screen showing HTML, CSS, and JavaScript layers
3. Scene 3 — Browser rendering trace showing DOM → Render Tree → Layout → Paint (Trace: trace-browser-renders-page)
4. Scene 4 — GET vs POST comparison table

Companion Material

• Article: How the Web Works
• Article: HTML, CSS, and JavaScript
• Diagram: The Web Request Lifecycle
• Trace: Trace a Browser Rendering a Page
• Practice: Parse an HTTP Exchange
• Interview: GET vs POST
• Learning Path: Web Development From the Ground Up