docs(10_Wiki): 위키 구조 정리 — 언어 튜토리얼 카테고리 폴더 제거 + 신규 자산 동기화

Topic_CSS/Topic_HTML/Topic_JavaScript/Topic_Prompt/Topic_Comfyui 등 기존 카테고리 폴더를 정리하고, Topic_Graphic/Dev 등 신규 산출물과 Topics 내부 세션/메모리 기록을 동기화.
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+---
+id: howto-css-button-split
+title: "How To - Split Buttons"
+category: "Web_Recipes"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["split button dropdown CSS"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.82
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["howto", "css", "w3schools", "buttons", "dropdown"]
+raw_sources: ["https://www.w3schools.com/howto/howto_css_button_split.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[HOWTO CSS Button Split]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+A "split button" is really just a dropdown menu (`.dropdown:hover .dropdown-content { display: block; }`) whose TRIGGER happens to be a second small button with a caret icon sitting immediately next to a normal action button — the dropdown-reveal mechanism itself (hidden content shown on `:hover`, positioned `absolute` inside a `relative`/`inline-block` wrapper) is identical to any other CSS-only dropdown; the only distinguishing feature is the visual split between "primary action" (left button) and "reveal more options" (right arrow button). [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Font Awesome icon library** — loaded via a `<link>` to a CDN stylesheet, providing the caret-down icon (`fa fa-caret-down`) used as the dropdown trigger. [S1]
+- **`.dropdown { position: absolute; display: inline-block; }`** — wraps the caret button and the dropdown content together as a positioning anchor. [S1]
+- **`.dropdown-content { display: none; position: absolute; }`** — the hidden menu, absolutely positioned relative to `.dropdown`. [S1]
+- **`.dropdown:hover .dropdown-content { display: block; }`** — the reveal mechanism: hovering the wrapper (which contains the caret button) shows the menu — a pure CSS `:hover` toggle, no JavaScript. [S1]
+- **Shared hover state across both buttons** — `.btn:hover, .dropdown:hover .btn { background-color: #0b7dda; }` keeps the main button's color in sync when the dropdown is open, even though the dropdown itself is only hovered via the caret button. [S1]
+
+## 📖 세부 내용 (Details)
+- HTML: `<button class="btn">Button</button> <div class="dropdown"> <button class="btn" style="border-left:1px solid navy"><i class="fa fa-caret-down"></i></button> <div class="dropdown-content"><a href="#">Link 1</a>...</div></div>`. [S1]
+- CSS reveal: `.dropdown:hover .dropdown-content { display: block; }`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+없음 — 신규 레시피, 기존 문서와 모순되는 내용 없음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+"Button" 옆에 캐럿 아이콘 버튼을 붙여 마우스를 올리면 Link 1/2/3 드롭다운이 나타나는 예제가 원문에서 직접 제시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Pure-CSS hover dropdown attached to a caret button (CSS):
+```css
+.dropdown { position: absolute; display: inline-block; }
+.dropdown-content { display: none; position: absolute; }
+.dropdown:hover .dropdown-content { display: block; }
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference)
+- **신뢰 점수:** 0.82
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[W3Schools HOW TO]]
+- **관련 개념:** [[HOWTO CSS Dropdown]], [[HOWTO CSS Dropdown Navbar]], [[HOWTO CSS Button Group]]
+- **참조 맥락:** CSS Buttons 섹션.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — How To - Split Buttons — https://www.w3schools.com/howto/howto_css_button_split.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "How To - Split Buttons" recipe (Astra wiki-curation, P-Reinforce v3.1 format).