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koriweb 9609c04755 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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title

CSS Flexbox Intro

🎯 한 줄 통찰 (One-line insight)

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]

🧠 핵심 개념 (Core concepts)

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]
Flex container — the parent element, made a flex container with display: flex (or inline-flex). [S1]
Flex items — the direct children of the container automatically become flex items. [S1]
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]

🧩 추출된 패턴 (Extracted patterns)

Container/item pattern — declare display: flex on a parent; its direct children become arrangeable flex items automatically. [S1]
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]

📖 세부 내용 (Details)

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]

Flexbox consists of: [S1]

A Flex Container — the parent element with display: flex or inline-flex. [S1]
Flex Items — the direct children that automatically become flex items. [S1]

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]

Example — a basic flex container with three items [S1]

<html>
<head>
<style>
.container {
  display: flex;
  background-color: DodgerBlue;
}

.container div {
  background-color: #f1f1f1;
  margin: 10px;
  padding: 20px;
  font-size: 30px;
}
</style>
</head>
<body>

<div class="container">
  <div>Item 1</div>
  <div>Item 2</div>
  <div>Item 3</div>
</div>

</body>
</html>

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]

🛠️ 적용 사례 (Applied in summary)

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.

💻 코드 패턴 (Code patterns)

Make an element a flex container (language: CSS):

.container {
  display: flex;
}

Container with three items (language: HTML):

<div class="container">
  <div>Item 1</div>
  <div>Item 2</div>
  <div>Item 3</div>
</div>

⚖️ 비교 및 선택 기준 (Comparison & decision criteria)

Flexbox — one-dimensional layout (rows OR columns). Choose it for arranging items along a single axis flexibly and responsively. [S1]
CSS Grid — two-dimensional layout (rows AND columns). Choose it when you need to control both axes simultaneously. [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: 0.88
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: CSS Tutorial
관련 개념: CSS Flex Container, CSS Flex Items, CSS Grid, CSS Media Queries
참조 맥락: The entry point for single-axis flexible layouts; precedes the Flex Container and Flex Items detail pages.

📚 출처 (Sources)

[S1] W3Schools — CSS Flexbox Intro — https://www.w3schools.com/css/css3_flexbox.asp

📝 변경 이력 (Change history)

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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