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-flex-items
+title: "CSS Flex Items"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["flex items", "flex-grow", "flex-shrink", "flex-basis", "order", "align-self", "flex shorthand"]
+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", "flexbox", "flex-items"]
+raw_sources: ["https://www.w3schools.com/css/css3_flexbox_items.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CSS Flex Items]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The direct child elements of a flex container automatically become flex items, controllable through six properties: `order`, `flex-grow`, `flex-shrink`, `flex-basis`, `flex`, and `align-self`. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Automatic flex items** — the direct child elements of a flex container automatically become flex items. [S1]
+- **Six item-level properties** — `order`, `flex-grow`, `flex-shrink`, `flex-basis`, `flex` (shorthand), and `align-self`. [S1]
+- **`align-self` overrides the container** — it overrides the default alignment set by the container's `align-items` property. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Item properties go on the child, not the container** — these properties are set on individual flex items (often inline in the examples). [S1]
+- **`flex` as a shorthand** — combine `flex-grow`, `flex-shrink`, and `flex-basis` into a single `flex` declaration. [S1]
+
+## 📖 세부 내용 (Details)
+The direct child elements of a flex container automatically becomes flex items. Flex items can be controlled through six key properties. [S1]
+
+**1. The `order` Property**
+The `order` property specifies the display order of the flex items inside the flex container. The default value is 0, and the value must be a number. [S1]
+```html
+<div class="flex-container">
+  <div style="order: 3">1</div>
+  <div style="order: 2">2</div>
+  <div style="order: 4">3</div>
+  <div style="order: 1">4</div>
+</div>
+```
+
+**2. The `flex-grow` Property**
+The `flex-grow` property specifies how much a flex item will grow relative to the rest of the flex items. The default value is 0. [S1]
+```html
+<div class="flex-container">
+  <div style="flex-grow: 1">1</div>
+  <div style="flex-grow: 1">2</div>
+  <div style="flex-grow: 4">3</div>
+</div>
+```
+
+**3. The `flex-shrink` Property**
+The `flex-shrink` property specifies how much a flex item will shrink relative to the rest of the flex items. The default value is 1. [S1]
+```html
+<div class="flex-container">
+  <div>1</div>
+  <div>2</div>
+  <div style="flex-shrink: 2">3</div>
+  <div>4</div>
+  <div>5</div>
+  <div>6</div>
+</div>
+```
+
+**4. The `flex-basis` Property**
+The `flex-basis` property specifies the initial length of a flex item. [S1]
+```html
+<div class="flex-container">
+  <div>1</div>
+  <div>2</div>
+  <div style="flex-basis: 250px">3</div>
+  <div>4</div>
+</div>
+```
+
+**5. The `flex` Property**
+The `flex` property is a shorthand property for the `flex-grow`, `flex-shrink`, and `flex-basis` properties. [S1]
+```html
+<div class="flex-container">
+  <div>1</div>
+  <div>2</div>
+  <div style="flex: 1 0 150px">3</div>
+  <div>4</div>
+</div>
+```
+
+**6. The `align-self` Property**
+The `align-self` property specifies the alignment for the selected item inside the flexible container. This property overrides the default alignment set by the container's `align-items` property. [S1]
+```html
+<div class="flex-container">
+  <div>1</div>
+  <div>2</div>
+  <div style="align-self: center">3</div>
+  <div>4</div>
+</div>
+```
+```html
+<div class="flex-container">
+  <div>1</div>
+  <div style="align-self: flex-start">2</div>
+  <div style="align-self: flex-end">3</div>
+  <div>4</div>
+</div>
+```
+
+**Flex Item Properties Table** [S1]
+
+| Property | Description |
+|----------|-------------|
+| `align-self` | Overrides container's `align-items` for individual items |
+| `flex` | Shorthand for `flex-grow`, `flex-shrink`, `flex-basis` |
+| `flex-basis` | Sets initial length |
+| `flex-grow` | Controls growth rate relative to siblings |
+| `flex-shrink` | Controls shrinkage rate relative to siblings |
+| `order` | Specifies display sequence |
+
+## 🛠️ 적용 사례 (Applied in summary)
+The page's own examples apply each property inline on `<div>` flex items inside a `.flex-container`. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Control individual flex items (language: HTML/CSS):
+```html
+<div class="flex-container">
+  <div style="order: 1">A</div>
+  <div style="flex-grow: 2">B</div>
+  <div style="flex: 1 0 150px">C</div>
+  <div style="align-self: center">D</div>
+</div>
+```
+
+## ⚖️ 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 Flexbox Justify Content]], [[CSS Flexbox Align Items]], [[CSS Flexbox Responsive]]
+- **참조 맥락:** Referenced whenever controlling the order, growth, shrinkage, basis, or self-alignment of individual flex children.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — CSS Flex Items — https://www.w3schools.com/css/css3_flexbox_items.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Flex Items" page (Astra wiki-curation, P-Reinforce v3.1 format).