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title

W3CSS Cards

🎯 한 줄 통찰 (One-line insight)

w3-hover-shadow can turn ANY plain element into something that behaves like a card purely on mouse-over — the source notes it uses "the same style as w3-card-4," meaning you can defer the card-like shadow effect to a hover interaction instead of applying it permanently, without needing a separate shadow value. [S1]

🧠 핵심 개념 (Core concepts)

w3-card — alias for w3-card-2 (2px bordered shadow). [S1]
w3-card-2 / w3-card-4 — containers with 2px/4px shadow depth respectively. [S1]
Composable with headers/footers — a card can contain its own <header>/<footer> with w3-container, creating distinct sections inside one card. [S1]
w3-hover-shadow — adds the card-4 shadow effect only on hover, making any plain element look card-like on mouse-over. [S1]
Photo cards — an <img> combined with a w3-container caption div inside a w3-card-4 wrapper. [S1]

📖 세부 내용 (Details)

Basic card: <div class="w3-card"><p>w3-card</p></div>. [S1]
Sectioned card with header/footer: <div class="w3-card-4"><header class="w3-container w3-blue"><h1>Header</h1></header><div class="w3-container"><p>Lorem ipsum...</p></div><footer class="w3-container w3-blue"><h5>Footer</h5></footer></div>. [S1]
Photo card: <div class="w3-card-4"><img src="img_snowtops.jpg" alt="Alps"><div class="w3-container w3-center"><p>The Italian / Austrian Alps</p></div></div>. [S1]
Hover-only shadow: <div class="w3-green w3-hover-shadow w3-center"><p>Hover over me!</p></div>. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 친구 요청 카드, 날씨 위젯 카드 등 header+container+footer 조합으로 구성된 복합 카드가 실전 UI 패턴의 대표 사례다. [S1]

💻 코드 패턴 (Code patterns)

Card-like shadow only on hover (HTML):

<div class="w3-green w3-hover-shadow w3-center">
  <p>Hover over me!</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)

상위/루트: W3.CSS Tutorial
관련 개념: W3CSS Borders, W3CSS Defaults, W3CSS Images
참조 맥락: Basics 섹션의 마지막 — 기본 설정(Defaults) 챕터로 이어짐.

📚 출처 (Sources)

[S1] W3Schools — W3.CSS Cards — https://www.w3schools.com/w3css/w3css_cards.asp

📝 변경 이력 (Change history)

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

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