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10_Wiki/Topic_Programming/Topic_W3CSS/W3CSS_Display.md

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+---
+id: w3css-display
+title: "W3CSS Display"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["w3-display-container", "positioning classes", "W3.CSS 디스플레이 위치"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.89
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["w3css", "css-framework", "w3schools", "display", "positioning"]
+raw_sources: ["https://www.w3schools.com/w3css/w3css_display.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[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):
+```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).