docs(10_Wiki): W3Schools 위키화 — HTML/CSS/JavaScript(core)

W3Schools 튜토리얼을 P-Reinforce v3.1 포맷으로 위키화(영어 본문, 한/영 섹션 헤더). - Topic_HTML: 59문서 (튜토리얼+예제, 레퍼런스/메타 제외) - Topic_CSS: 190문서 (메인 + Advanced/Flexbox/Grid/RWD 전체) - Topic_JavaScript: 120문서 (코어 언어; Temporal/DOM상세/BOM/WebAPI/AJAX/jQuery/Graphics 등은 후속) 각 폴더 00_INDEX.md(MOC) 포함. 코드 verbatim, 미확인분은 "Not found in source" 표기. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-23 19:21:18 +09:00
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+---
+id: css-combinators
+title: "CSS Combinators"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["combinators", "descendant selector", "child selector", "sibling selector", "selector relationships"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.89
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["css", "web", "frontend", "w3schools", "selectors", "combinators"]
+raw_sources: ["https://www.w3schools.com/css/css_combinators.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CSS Combinators]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+A combinator defines the relationship between two or more selectors, letting you target elements by their position relative to another element — descendants (space), direct children (`>`), the next sibling (`+`), or all following siblings (`~`). [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **What a combinator is** — something that defines the relationship between two or more selectors. [S1]
+- **Descendant combinator (space)** — matches all elements that are descendants (children, grandchildren, etc.) of a specified element. [S1]
+- **Child combinator (`>`)** — selects all elements that are direct children of a specified element. [S1]
+- **Next sibling combinator (`+`)** — selects an element that is directly after a specific element (the first adjacent sibling). [S1]
+- **Subsequent-sibling combinator (`~`)** — selects all elements that are next siblings of a specified element. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Relationship-based selection** — instead of adding classes, target elements by structural relationship (`div p`, `div > p`, `div + p`, `div ~ p`). [S1]
+- **Direct-child vs any-descendant** — use a space to reach any depth, `>` to restrict to immediate children. [S1]
+- **One-sibling vs all-siblings** — `+` matches only the first following sibling, `~` matches every following sibling. [S1]
+
+## 📖 세부 내용 (Details)
+**Definition**
+A combinator is something that defines the relationship between two or more selectors. [S1]
+
+**Descendant Combinator (space)**
+The descendant combinator matches all elements that are descendants (children, grandchildren, etc.) of a specified element. The following example selects all `<p>` elements inside `<div>` elements: [S1]
+```css
+div p {
+  background-color: yellow;
+}
+```
+
+**Child Combinator (`>`)**
+The child combinator selects all elements that are direct children of a specified element. The following example selects all `<p>` elements that are immediate children of a `<div>`: [S1]
+```css
+div > p {
+  background-color: yellow;
+}
+```
+
+**Next Sibling Combinator (`+`)**
+The next sibling combinator is used to select an element that is directly after a specific element. Sibling elements must have the same parent element, and "adjacent" means "immediately following". The following example selects the first `<p>` element placed immediately after a `<div>`: [S1]
+```css
+div + p {
+  background-color: yellow;
+}
+```
+
+**Subsequent-sibling Combinator (`~`)**
+The subsequent-sibling combinator selects all elements that are next siblings of a specified element. The following example selects all `<p>` elements that are siblings of (and come after) a `<div>`: [S1]
+```css
+div ~ p {
+  background-color: yellow;
+}
+```
+
+The page references a complete CSS Combinators Reference for additional details. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+The page's own applied examples demonstrate each of the four combinators by setting `background-color: yellow;` on the matched `<p>` elements. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+The four combinators (language: CSS):
+```css
+div p   { background-color: yellow; } /* descendant */
+div > p { background-color: yellow; } /* direct child */
+div + p { background-color: yellow; } /* next sibling */
+div ~ p { background-color: yellow; } /* all following siblings */
+```
+
+## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
+- **Descendant (space) vs Child (`>`)** — space matches descendants at any depth; `>` restricts to immediate children only. [S1]
+- **Next sibling (`+`) vs Subsequent sibling (`~`)** — `+` matches only the single element directly following; `~` matches every following sibling with the same parent. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+No contradictions found in the source.
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
+- **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:** [[CSS Tutorial]]
+- **관련 개념:** [[CSS Selectors]], [[CSS Pseudo-classes]], [[CSS Pseudo-elements]], [[CSS Syntax]]
+- **참조 맥락:** Referenced whenever you need to select elements by their structural relationship rather than by class or id.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — CSS Combinators — https://www.w3schools.com/css/css_combinators.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Combinators" page (Astra wiki-curation, P-Reinforce v3.1 format).