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Antigravity Agent e9cbf23ab5 docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합

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2026-07-05 00:39:13 +09:00

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title

W3CSS Display

🎯 한 줄 통찰 (One-line insight)

The nine w3-display-* position classes only work as children of a w3-display-container — text placed inside an <img>'s wrapping container using w3-display-topleft/w3-display-bottomright/etc. can even simulate a flag graphic purely from four colored positioned blocks, showing the position system is really absolute positioning against one specific parent, not a general-purpose overlay tool. [S1]

🧠 핵심 개념 (Core concepts)

w3-display-container — the required parent wrapper for all w3-display-* position classes. [S1]
9 position classes — topleft, topright, bottomleft, bottomright, left, right, middle, topmiddle, bottommiddle. [S1]
w3-display-hover — content stays hidden until the container is hovered, then appears — combinable with effect/animation classes for interactive overlays. [S1]
w3-left / w3-right — CSS float shortcuts (not the same as w3-display-left/right, which are absolute-position within a display-container). [S1]
w3-show / w3-hide — force display:block/display:none, often used to toggle visibility via JS. [S1]
w3-mobile — makes an element display:block; width:100% specifically on screens under 600px wide. [S1]

📖 세부 내용 (Details)

Text over an image using all 9 positions: <div class="w3-display-container"><img src="img_lights.jpg" style="width:100%"><div class="w3-padding w3-display-topleft">Top Left</div>...</div>. [S1]
Hover-reveal overlay: <div class="w3-display-container w3-hover-opacity"><img src="img_avatar.png"><div class="w3-display-middle w3-display-hover"><button class="w3-button w3-black">John Doe</button></div></div>. [S1]
Flag simulation via 4 positioned colored blocks: <div class="w3-display-container w3-card-4" style="height:200px;width:350px"><div class="w3-red w3-display-topleft" style="width:25%;height:40%"></div><div class="w3-red w3-display-topright" style="width:60%;height:40%"></div>...</div>. [S1]
Floating (distinct mechanism from display-position): <div class="w3-bar w3-light-grey"><div class="w3-left w3-red">w3-left</div><div class="w3-right w3-blue">w3-right</div></div> — note: w3-container auto-clears floats. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

position 클래스는 반드시 컨테이너 필요: w3-display-* 클래스는 w3-display-container 부모 없이는 동작하지 않는다는 점이 구조적 전제로 강조됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 이미지 위에 9방향 텍스트 라벨을 배치하거나, 4개의 색 블록으로 국기를 시뮬레이션하는 것이 절대 위치 지정의 창의적 활용 사례다. [S1]

💻 코드 패턴 (Code patterns)

Simulating a flag with four positioned colored blocks (HTML):

<div class="w3-display-container w3-card-4" style="height:200px;width:350px">
  <div class="w3-red w3-display-topleft" style="width:25%;height:40%"></div>
  <div class="w3-red w3-display-topright" style="width:60%;height:40%"></div>
  <div class="w3-red w3-display-bottomleft" style="width:25%;height:40%"></div>
  <div class="w3-red w3-display-bottomright" style="width:60%;height:40%"></div>
</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 RTL, W3CSS Buttons, W3CSS Effects
참조 맥락: Spacing & Layout 섹션의 마지막 — 버튼(Buttons) 챕터로 이어짐.

📚 출처 (Sources)

[S1] W3Schools — W3.CSS Display — https://www.w3schools.com/w3css/w3css_display.asp

📝 변경 이력 (Change history)

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

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