First Move (11~18) - Code, Learn, Build
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First Move (11~18) - Code, Learn, Build

Structured, level-based technology learning paths from foundational exploration to industry mastery.

Learning Domains

  • Python Programming (Active)
  • Computer Science Core
  • Web Development
  • AI & Machine Learning

Platform Architecture

  • Level-Based Progression
  • Decoupled Content Schema
  • Modular Code Execution Engine
  • Curated Official Resources

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Readability & Accessibility First

← HTML5 & Modern CSS Layout Systems|Level 1: HTML5 Semantics, Accessibility & Forms

1. Semantic HTML5 Elements & Accessible Document Architecture

Lesson 1 of 6
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Semantic HTML5 Elements & Accessible Document Architecture

Structure web documents cleanly using <header>, <nav>, <main>, <article>, <section>, <aside>, and <footer> tags.

Learning Objectives & Semantic Web Markup

### Learning Objectives - Differentiate between generic container tags (`<div>`, `<span>`) and semantic HTML5 structural elements. - Construct accessible HTML document outlines for screen readers and web search engines (SEO). - Implement ARIA attributes (`aria-label`, `role`) to enhance web accessibility (a11y). - Create accessible form controls with explicit `<label for="...">` binding. --- ### Why Semantic HTML Matters Prior to HTML5, developers relied almost exclusively on unsemantic `<div id="header">` and `<div class="nav">` elements. Semantic HTML tags clearly describe their meaning to both the browser and developer, providing critical structural context for screen readers and search crawler indexing.

HTML5 Structural Tag Reference Matrix

### HTML5 Landmark Elements | Element | Purpose | Accessibility Role | | :--- | :--- | :--- | | `<header>` | Page banner or section intro containing branding/nav | `banner` | | `<nav>` | Major navigational link group | `navigation` | | `<main>` | Central unique document content (only ONE per page) | `main` | | `<article>` | Self-contained, independently distributable content unit | `article` | | `<section>` | Standalone thematic grouping of content with heading | `region` | | `<aside>` | Content indirectly related to surrounding content | `complementary` | | `<footer>` | Copyright, author info, or footer links | `contentinfo` |
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