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84 lines
4.5 KiB
Markdown
84 lines
4.5 KiB
Markdown
---
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id: w3css-dropdowns
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title: "W3CSS Dropdowns"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["w3-dropdown-hover", "w3-dropdown-click", "W3.CSS 드롭다운"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.87
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["w3css", "css-framework", "w3schools", "dropdown", "navigation"]
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raw_sources: ["https://www.w3schools.com/w3css/w3css_dropdowns.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[W3CSS Dropdowns]]
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## 🎯 한 줄 통찰 (One-line insight)
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`w3-dropdown-hover` and `w3-dropdown-content` place NO constraint on element type — the source explicitly demonstrates the exact same dropdown behavior using `<button>`+`<div>`, then `<p>`+`<span>`, proving the pattern is a pure CSS relationship (hover state on parent reveals a positioned child), not tied to any specific semantic markup. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`w3-dropdown-hover`** — marks an element as a hoverable dropdown trigger; any element type works. [S1]
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- **`w3-dropdown-content`** — the content revealed on hover/click; hidden by default, shown via CSS `:hover` or JS-toggled class. [S1]
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- **`w3-dropdown-click`** — clickable variant; requires JavaScript to explicitly toggle a `w3-show` class since there's no `:hover` state to rely on. [S1]
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- **`w3-show`** — the class JS toggles on/off to reveal/hide click-based dropdown content. [S1]
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- **Animation composability** — any `w3-animate-*` class can be added directly to `w3-dropdown-content` for a fade/zoom/slide reveal. [S1]
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- **Right-aligned positioning** — combining `w3-right` (float) with inline `right:0` CSS makes the dropdown content open right-to-left instead of left-to-right. [S1]
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## 📖 세부 내용 (Details)
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- Hover dropdown with any element types: `<p class="w3-dropdown-hover">Hover over me!<span class="w3-dropdown-content w3-green">Hello World!</span></p>`. [S1]
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- Click dropdown with JS toggle: `<div class="w3-dropdown-click"><button onclick="myFunction()" class="w3-button w3-black">Click Me!</button><div id="Demo" class="w3-dropdown-content w3-bar-block w3-border">...</div></div>` with `function myFunction() { var x = document.getElementById("Demo"); if (x.className.indexOf("w3-show") == -1) { x.className += " w3-show"; } else { x.className = x.className.replace(" w3-show", ""); } }`. [S1]
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- Animated dropdown content: `<div id="Demo" class="w3-dropdown-content w3-bar-block w3-animate-zoom">`. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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- **hover vs click 방식의 근본적 차이**: w3-dropdown-hover는 순수 CSS :hover로 동작하지만 w3-dropdown-click은 JavaScript로 w3-show 클래스를 수동 토글해야 한다는 구조적 차이가 있음. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — 네비게이션 바 안에 드롭다운 메뉴를 넣는 조합이 다음 챕터(Navigation Bars)에서 본격적으로 다뤄지는 실전 활용의 시작점이다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Clickable dropdown toggled via JavaScript's w3-show class (HTML/JS):
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```html
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<div class="w3-dropdown-click">
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<button onclick="myFunction()" class="w3-button w3-black">Click Me!</button>
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<div id="Demo" class="w3-dropdown-content w3-bar-block w3-border">
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<a href="#" class="w3-bar-item w3-button">Link 1</a>
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</div>
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</div>
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<script>
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function myFunction() {
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var x = document.getElementById("Demo");
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if (x.className.indexOf("w3-show") == -1) {
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x.className += " w3-show";
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} else {
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x.className = x.className.replace(" w3-show", "");
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}
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}
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</script>
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.87
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[W3.CSS Tutorial]]
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- **관련 개념:** [[W3CSS Bars]], [[W3CSS Accordions]], [[W3CSS Navigation]]
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- **참조 맥락:** hover/click 기반 콘텐츠 공개 패턴 — 아코디언(Accordions) 챕터와 직접 대비됨.
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## 📚 출처 (Sources)
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- [S1] W3Schools — W3.CSS Dropdowns — https://www.w3schools.com/w3css/w3css_dropdowns.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "W3.CSS Dropdowns" page (Astra wiki-curation, P-Reinforce v3.1 format).
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