---
id: w3css-bars
title: "W3CSS Bars"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["w3-bar", "w3-bar-block", "w3-bar-item", "W3.CSS 바"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.87
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["w3css", "css-framework", "w3schools", "bars", "navigation"]
raw_sources: ["https://www.w3schools.com/w3css/w3css_bars.asp"]
applied_in: []
github_commit: ""
---

# [[W3CSS Bars]]

## 🎯 한 줄 통찰 (One-line insight)
`w3-bar` (horizontal) and `w3-bar-block` (vertical) are the exact same conceptual container differing only in ONE class name — meaning every color, hover, button, and responsive technique demonstrated for a horizontal bar transfers identically to a vertical sidebar, so this single chapter is really the foundation for both the later Navigation Bars AND Sidebar chapters. [S1]

## 🧠 핵심 개념 (Core concepts)
- **`w3-bar`** — horizontal container for bar items. **`w3-bar-block`** — vertical container, same item classes apply. [S1]
- **`w3-bar-item`** — provides correct spacing/padding/positioning for each item inside a bar; works on any element (`div`, `a`, etc.). [S1]
- **Color + hover-color composability** — any `w3-color` class sets the bar's base color, and any `w3-hover-color` class can be added per-item for a distinct hover color. [S1]
- **`w3-button`** — turns bar items (especially `<a>` links) into clickable button-styled elements. [S1]
- **`w3-mobile`** — makes bar items responsive (stack/adjust on small screens). [S1]
- **`w3-right`** — right-aligns a specific bar item within the bar. [S1]

## 📖 세부 내용 (Details)
- Horizontal bar: `<div class="w3-bar w3-green"><div class="w3-bar-item">London</div><div class="w3-bar-item">Paris</div><div class="w3-bar-item">Tokyo</div></div>`. [S1]
- Vertical bar (same items, one class swapped): `<div class="w3-bar-block w3-green">...</div>`. [S1]
- Bar as navigation with buttons: `<div class="w3-bar w3-black"><a href="#" class="w3-bar-item w3-button">London</a>...</div>`. [S1]
- Right-aligned last item: `<a href="#" class="w3-bar-item w3-button w3-right">Tokyo</a>` as the final child. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- 현재까지 발견된 모순 사항 없음 (No contradictions found in available sources).

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — w3-bar 하나의 클래스 교체(w3-bar-block)만으로 수평/수직 네비게이션을 모두 만드는 패턴이 다음 챕터들(Navigation, Sidebar)의 기반이 된다. [S1]

## 💻 코드 패턴 (Code patterns)
The same items in horizontal vs vertical bar — only the container class changes (HTML):
```html
<!-- Horizontal -->
<div class="w3-bar w3-black">
  <a href="#" class="w3-bar-item w3-button">Home</a>
  <a href="#" class="w3-bar-item w3-button">Link 1</a>
</div>

<!-- Vertical: same items, w3-bar-block instead of w3-bar -->
<div class="w3-bar-block w3-black">
  <a href="#" class="w3-bar-item w3-button">Home</a>
  <a href="#" class="w3-bar-item w3-button">Link 1</a>
</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:** 0.87
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[W3.CSS Tutorial]]
- **관련 개념:** [[W3CSS Effects]], [[W3CSS Dropdowns]], [[W3CSS Navigation]], [[W3CSS Sidebar]]
- **참조 맥락:** Navigation Components 섹션 첫 항목이자 기초 — 드롭다운(Dropdowns) 챕터로 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — W3.CSS Bars — https://www.w3schools.com/w3css/w3css_bars.asp

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