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

© 2026 First Move (11~18) • CODE • LEARN • BUILD. Built with Next.js App Router.

Readability & Accessibility First

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

2. Accessible HTML5 Forms, Inputs & Native Validation

Lesson 2 of 6
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Accessible HTML5 Forms, Inputs & Native Validation

Construct accessible web forms using <input>, <select>, <textarea>, native constraints (required, pattern, min/max), and ARIA helper text.

Native Form Validation Invariants

### HTML5 Input Types & Native Constraints HTML5 provides native browser-level input validation using input type attributes (`type="email"`, `type="number"`, `type="url"`) alongside validation attributes: - `required`: Prevents form submission if empty. - `pattern`: Enforces regular expression matching. - `min` / `max`: Enforces numerical boundary ranges.
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