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title

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):

<!-- 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).

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