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id title category status verification_status canonical_id aliases duplicate_of source_trust_level confidence_score created_at updated_at review_reason merge_history tags raw_sources applied_in github_commit
w3css-borders W3CSS Borders Programming_Language draft conceptual
w3-border
w3-leftbar
W3.CSS 테두리
B 0.89 2026-07-04 2026-07-04
w3css
css-framework
w3schools
borders
https://www.w3schools.com/w3css/w3css_borders.asp

W3CSS Borders

🎯 한 줄 통찰 (One-line insight)

A border can be made "invisible" yet still functional as a hover trigger — setting border:16px solid white on an element paired with w3-hover-border-green creates a thick border that's visually undetectable against a white background until hovered, at which point it visibly appears in green, a trick that relies on the border occupying space without being seen. [S1]

🧠 핵심 개념 (Core concepts)

  • w3-border / w3-border-{top,right,bottom,left} — adds borders to specific sides; w3-border-0 removes all borders. [S1]
  • w3-border-COLOR — sets border color (e.g. w3-border-red). [S1]
  • w3-round-{small,large,xlarge,xxlarge} — rounds border corners at different intensities; plain w3-round is the default rounding. [S1]
  • w3-topbar / w3-bottombar / w3-leftbar / w3-rightbar — add THICK single-side borders (heavier than normal w3-border-*). [S1]
  • w3-hover-border-COLOR — changes border color specifically on mouse hover. [S1]
  • Invisible-until-hover border trick — a white/matching-background border becomes visible only on hover via w3-hover-border-*. [S1]

📖 세부 내용 (Details)

  • Directional borders: <div class="w3-panel w3-border-left"><p>I have only a left border.</p></div>. [S1]
  • Colored border: <div class="w3-panel w3-border w3-border-red"><p>I have red borders.</p></div>. [S1]
  • Thick bar border: <div class="w3-panel w3-leftbar w3-border-blue w3-pale-blue"><p>I have a thick blue left border and a pale-blue background color.</p></div>. [S1]
  • Invisible-until-hover: <div style="border:16px solid white" class="w3-panel w3-hover-border-green"><p>Thick (invisible) border that turns green on hover.</p></div>. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 배경과 같은 색의 두꺼운 테두리를 호버 시에만 드러내는 트릭이 UI 인터랙션 디자인의 대표 실전 사례다. [S1]

💻 코드 패턴 (Code patterns)

Invisible border that reveals itself on hover (HTML):

<div style="border:16px solid white" class="w3-panel w3-hover-border-green">
  <p>Thick (invisible) border that turns green on hover.</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: 0.89
  • 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

📚 출처 (Sources)

📝 변경 이력 (Change history)

  • 2026-07-04: Initial draft synthesized from the W3Schools "W3.CSS Borders" page (Astra wiki-curation, P-Reinforce v3.1 format).