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

이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영. - Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들 (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거. - Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/ Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/ Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이 존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존). - Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/ JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동. - 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리. - Topic_Programming 최종 문서 수: 2784 → 3985.
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+---
+id: w3css-sidebar
+title: "W3CSS Sidebar"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["w3-sidebar", "w3-overlay", "side navigation", "W3.CSS 사이드바"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.87
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["w3css", "css-framework", "w3schools", "sidebar", "navigation"]
+raw_sources: ["https://www.w3schools.com/w3css/w3css_sidebar.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[W3CSS Sidebar]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+"Open over content" and "slide content to the right" are NOT the same interaction despite looking similar — the former only toggles the sidebar's own `display`, while the latter additionally animates the MAIN content's `margin-left`, meaning a push-style sidebar requires coordinating two separate elements' styles in the same JS function, not just revealing the sidebar itself. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`w3-sidebar`** — the base class for a vertical, typically fixed-position side navigation panel. [S1]
+- **Six distinct sidebar interaction patterns** — always-visible, collapsible-responsive, overlay-over-part, overlay-over-all, slide-content-right, and right-side instead of left. [S1]
+- **`margin-left` reservation** — an always-visible sidebar requires the adjacent content div to have a matching `margin-left` (e.g. sidebar `width:25%` pairs with content `margin-left:25%`) so content doesn't render underneath it. [S1]
+- **`w3-collapse`** — combined with `w3-hide-large`, creates a sidebar that's always visible on large screens but hidden/toggle-controlled on small screens. [S1]
+- **`w3-overlay`** — adds a semi-transparent (50% opacity) black layer over page content while the sidebar is open, visually emphasizing the open sidebar without changing its position. [S1]
+- **Right-side placement** — simply swapping `style="left:0"` for `style="right:0"` (or omitting `left` and adding `right:0`) relocates the entire sidebar system to the opposite edge. [S1]
+
+## 📖 세부 내용 (Details)
+- Always-visible sidebar with reserved content margin: `<div class="w3-sidebar w3-bar-block" style="width:25%">...</div><div style="margin-left:25%">... page content ...</div>`. [S1]
+- Slide-content-right (distinct from simple overlay): `function w3_open() { document.getElementById("main").style.marginLeft = "25%"; document.getElementById("mySidebar").style.width = "25%"; document.getElementById("mySidebar").style.display = "block"; }` — moves BOTH the sidebar and the main content. [S1]
+- Overlay effect: `<div class="w3-overlay" onclick="w3_close()" style="cursor:pointer" id="myOverlay"></div>` shown/hidden alongside the sidebar via the same open/close functions. [S1]
+- Collapsible responsive sidebar: `<div class="w3-sidebar w3-bar-block w3-collapse w3-card" style="width:200px;" id="mySidebar"><button class="w3-bar-item w3-button w3-hide-large" onclick="w3_close()">Close &times;</button>...</div>` paired with a `w3-main` content div using matching `margin-left`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **오버레이 vs 콘텐츠 밀기의 차이**: 단순 오버레이는 사이드바의 display만 바꾸지만, "슬라이드" 방식은 사이드바뿐 아니라 메인 콘텐츠의 marginLeft까지 함께 변경해야 한다는 구현 차이가 있음. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — w3-overlay로 사이드바 오픈 시 배경을 어둡게 처리해 시선을 집중시키는 패턴이 모바일 메뉴 UX의 대표 실전 기법이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Sidebar with a semi-transparent overlay over the page content (HTML/JS):
+```html
+<div class="w3-sidebar w3-bar-block" style="display:none;z-index:5" id="mySidebar">
+  <button class="w3-bar-item w3-button" onclick="w3_close()">Close</button>
+  <a href="#" class="w3-bar-item w3-button">Link 1</a>
+</div>
+<div class="w3-overlay" onclick="w3_close()" style="cursor:pointer" id="myOverlay"></div>
+<script>
+function w3_open() {
+  document.getElementById("mySidebar").style.display = "block";
+  document.getElementById("myOverlay").style.display = "block";
+}
+function w3_close() {
+  document.getElementById("mySidebar").style.display = "none";
+  document.getElementById("myOverlay").style.display = "none";
+}
+</script>
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.87
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[W3.CSS Tutorial]]
+- **관련 개념:** [[W3CSS Navigation]], [[W3CSS Accordions]], [[W3CSS Dropdowns]], [[W3CSS Tabulators]]
+- **참조 맥락:** Navigation Components 섹션 마지막 — UI Components 섹션의 탭(Tabulators) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — W3.CSS Sidebar — https://www.w3schools.com/w3css/w3css_sidebar.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "W3.CSS Sidebar" page (Astra wiki-curation, P-Reinforce v3.1 format).