---
id: w3css-panels
title: "W3CSS Panels"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["w3-panel", "W3.CSS 패널"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.9
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["w3css", "css-framework", "w3schools", "panels"]
raw_sources: ["https://www.w3schools.com/w3css/w3css_panels.asp"]
applied_in: []
github_commit: ""
---

# [[W3CSS Panels]]

## 🎯 한 줄 통찰 (One-line insight)
`w3-panel` is just `w3-container` plus 16px top/bottom margin — one small structural difference that makes it the base class for FOUR distinct UI patterns (notes, quotes, alerts, cards) purely by combining it with different color/style modifier classes, rather than needing four separate component classes. [S1]

## 🧠 핵심 개념 (Core concepts)
- **`w3-panel`** — adds 16px top/bottom margin AND 16px left/right padding (container + vertical spacing). [S1]
- **Notes** — panel + pale color (e.g. `w3-pale-green`). [S1]
- **Quotes** — panel + `w3-leftbar w3-sand w3-xxlarge w3-serif`. [S1]
- **Alerts** — panel + strong/saturated color (e.g. plain `w3-red`). [S1]
- **Cards** — panel + `w3-card-4`. [S1]
- **Show/hide via inline `onclick`** — no JS file needed; `this.parentElement.style.display='none'` closes a panel; `document.getElementById(...).style.display='block'` reopens it. [S1]

## 📖 세부 내용 (Details)
- Basic panel: `<div class="w3-panel w3-red"><p>I am a panel.</p></div>`. [S1]
- Note styling: `<div class="w3-panel w3-pale-green"><p>...</p></div>`. [S1]
- Quote styling: `<div class="w3-panel w3-leftbar w3-sand w3-xxlarge w3-serif"><p><i>"Make it as simple as possible, but not simpler."</i></p></div>`. [S1]
- Hide a panel: `<span onclick="this.parentElement.style.display='none'" class="w3-button w3-display-topright">X</span>`. [S1]
- Show a hidden panel: `<button onclick="document.getElementById('id01').style.display='block'">Show panel</button>`. [S1]

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

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 하나의 w3-panel 기반 클래스로 노트/인용문/알림/카드 4가지 UI 패턴을 구현하는 것이 클래스 조합 설계의 대표 사례다. [S1]

## 💻 코드 패턴 (Code patterns)
Dismissible panel using inline onclick, no JS file needed (HTML):
```html
<div class="w3-panel w3-display-container">
  <span onclick="this.parentElement.style.display='none'"
        class="w3-button w3-display-topright">X</span>
  <p>Click on the X to close this panel.</p>
</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:** 0.90
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[W3.CSS Tutorial]]
- **관련 개념:** [[W3CSS Containers]], [[W3CSS Notes]], [[W3CSS Quotes]], [[W3CSS Alerts]], [[W3CSS Cards]]
- **참조 맥락:** 노트/인용문/알림/카드의 공통 기반 — 테두리(Borders) 챕터로 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — W3.CSS Panels — https://www.w3schools.com/w3css/w3css_panels.asp

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