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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>
121 lines
4.9 KiB
Markdown
121 lines
4.9 KiB
Markdown
---
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id: css-flexbox-intro
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title: "CSS Flexbox Intro"
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category: "Frontend"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["Flexbox", "Flexible Box Layout", "display flex", "flex container flex items", "CSS flex layout"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.88
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created_at: 2026-06-23
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updated_at: 2026-06-23
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review_reason: ""
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merge_history: []
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tags: ["css", "web", "frontend", "w3schools", "flexbox", "layout"]
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raw_sources: ["https://www.w3schools.com/css/css3_flexbox.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Flexbox Intro]]
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## 🎯 한 줄 통찰 (One-line insight)
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CSS Flexbox (the Flexible Box Layout module) is a one-dimensional layout model that arranges items horizontally or vertically inside a flex container in a flexible, responsive way. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **What it is** — CSS Flexbox is short for the CSS Flexible Box Layout module; it is a layout model for arranging items (horizontally or vertically) within a container, in a flexible and responsive way. [S1]
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- **Flex container** — the parent element, made a flex container with `display: flex` (or `inline-flex`). [S1]
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- **Flex items** — the direct children of the container automatically become flex items. [S1]
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- **One- vs two-dimensional** — CSS Flexbox is used for a one-dimensional layout, with rows OR columns; CSS Grid is used for a two-dimensional layout, with rows AND columns. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Container/item pattern** — declare `display: flex` on a parent; its direct children become arrangeable flex items automatically. [S1]
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- **One-dimensional choice** — reach for flexbox when laying out along a single axis (a row OR a column); reach for Grid for two-axis layouts. [S1]
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## 📖 세부 내용 (Details)
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CSS Flexbox is short for the CSS Flexible Box Layout module. Flexbox is a layout model for arranging items (horizontally or vertically) within a container, in a flexible and responsive way. [S1]
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Flexbox consists of: [S1]
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- **A Flex Container** — the parent element with `display: flex` or `inline-flex`. [S1]
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- **Flex Items** — the direct children that automatically become flex items. [S1]
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**Flexbox vs Grid:** CSS Flexbox is used for a one-dimensional layout, with rows OR columns. CSS Grid is used for a two-dimensional layout, with rows AND columns. [S1]
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**Example — a basic flex container with three items** [S1]
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```html
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<html>
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<head>
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<style>
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.container {
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display: flex;
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background-color: DodgerBlue;
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}
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.container div {
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background-color: #f1f1f1;
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margin: 10px;
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padding: 20px;
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font-size: 30px;
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}
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</style>
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</head>
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<body>
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<div class="container">
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<div>Item 1</div>
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<div>Item 2</div>
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<div>Item 3</div>
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</div>
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</body>
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</html>
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```
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**CSS Flexbox properties / browser-support table:** Not found in source (a property reference table was not present in the fetched content for this intro page; the source links forward to the Flex Container, Flex Items, and Flex Responsive pages). [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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The page's applied example is a `.container` set to `display: flex` with a DodgerBlue background holding three styled `div` children ("Item 1", "Item 2", "Item 3"), which render in a horizontal row. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Make an element a flex container (language: CSS):
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```css
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.container {
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display: flex;
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}
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```
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Container with three items (language: HTML):
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```html
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<div class="container">
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<div>Item 1</div>
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<div>Item 2</div>
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<div>Item 3</div>
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</div>
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```
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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- **Flexbox** — one-dimensional layout (rows OR columns). Choose it for arranging items along a single axis flexibly and responsively. [S1]
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- **CSS Grid** — two-dimensional layout (rows AND columns). Choose it when you need to control both axes simultaneously. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source.
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.88
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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:** [[CSS Tutorial]]
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- **관련 개념:** [[CSS Flex Container]], [[CSS Flex Items]], [[CSS Grid]], [[CSS Media Queries]]
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- **참조 맥락:** The entry point for single-axis flexible layouts; precedes the Flex Container and Flex Items detail pages.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Flexbox Intro — https://www.w3schools.com/css/css3_flexbox.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Flexbox Intro" page (Astra wiki-curation, P-Reinforce v3.1 format).
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