---
id: w3css-intro
title: "W3CSS Intro"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["W3.CSS Demo", "Kitchen Sink", "W3.CSS 소개"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.86
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["w3css", "css-framework", "w3schools", "intro"]
raw_sources: ["https://www.w3schools.com/w3css/w3css_intro.asp"]
applied_in: []
github_commit: ""
---

# [[W3CSS Intro]]

## 🎯 한 줄 통찰 (One-line insight)
This "Kitchen Sink" intro page is deliberately a survey, not a tutorial — it flashes a tiny live sample of EVERY major W3.CSS feature (colors, containers, panels, cards, grid, flexbox, modals, tabs, animations, etc.) in one scroll, functioning as a visual table of contents that previews what each later chapter will teach in depth. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Purpose** — a single-page "kitchen sink" demo giving a bite-sized preview of nearly every W3.CSS component before diving into individual chapters. [S1]
- **Core class families previewed** — `w3-container`, `w3-panel`, `w3-card`, `w3-table`, `w3-ul`, `w3-button`/`w3-btn`, `w3-tag`/`w3-badge`, `w3-grid`, `w3-flex`, `w3-row`, `w3-display-*`, `w3-modal`, `w3-dropdown`, `w3-bar` (navigation), `w3-animate-*`. [S1]
- **w3-grid vs w3-flex distinction (previewed here, detailed later)** — grid is two-dimensional (rows AND columns); flex is one-dimensional (rows OR columns). [S1]

## 📖 세부 내용 (Details)
- Container example: `<div class="w3-container w3-teal"><h1>This is a Header</h1></div>`. [S1]
- Panel example: `<div class="w3-panel w3-red"><p>I am a panel</p></div>`. [S1]
- Card example: `<div class="w3-card-4"><img src="img_snowtops.jpg" alt="Alps"><div class="w3-container w3-center"><p>French Alps</p></div></div>`. [S1]
- Grid example: `<div class="w3-grid"><div>1</div><div>2</div><div>3</div><div>4</div></div>`. [S1]
- Flex example: `<div class="w3-flex" style="gap:8px"><div>1</div><div>2</div><div>3</div></div>`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
소스에서 모순되는 정보는 발견되지 않음.

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 이 페이지 자체가 W3.CSS 전체 기능의 축소판 시연이며, 각 컴포넌트는 이후 챕터에서 상세히 다뤄진다. [S1]

## 💻 코드 패턴 (Code patterns)
Grid vs flex, previewed side by side (HTML):
```html
<div class="w3-grid"> <!-- two-dimensional: rows AND columns -->
  <div>1</div><div>2</div><div>3</div><div>4</div>
</div>
<div class="w3-flex" style="gap:8px"> <!-- one-dimensional: rows OR columns -->
  <div>1</div><div>2</div><div>3</div>
</div>
```

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.86
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[W3.CSS Tutorial]]
- **관련 개념:** [[W3CSS Colors]], [[W3CSS Containers]], [[W3CSS Grid]], [[W3CSS Flexbox]]
- **참조 맥락:** 전체 프레임워크의 축소 시연 — Colors 챕터로 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — W3.CSS Demo (Kitchen Sink) — https://www.w3schools.com/w3css/w3css_intro.asp

## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "W3.CSS Demo (Kitchen Sink)" page (Astra wiki-curation, P-Reinforce v3.1 format).