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>
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id: css-grid-intro
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title: "CSS Grid 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: ["CSS Grid", "Grid Layout Module", "two-dimensional layout", "display grid", "grid container"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.89
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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", "grid", "layout"]
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raw_sources: ["https://www.w3schools.com/css/css_grid.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Grid Intro]]
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## 🎯 한 줄 통찰 (One-line insight)
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The CSS Grid Layout Module offers a grid-based layout system with rows and columns, enabling complex, responsive two-dimensional layouts without using float or positioning. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Grid Layout Module** — offers a grid-based layout system, with rows and columns, making it easier to design web pages without having to use float or positioning. [S1]
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- **Two-dimensional** — CSS Grid is used for two-dimensional layout, with rows AND columns; CSS Flexbox is used for one-dimensional layout, with rows OR columns. [S1]
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- **Grid Container** — the parent element where `display` is set to `grid` or `inline-grid`. [S1]
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- **Grid Items** — the direct children of the grid container, which automatically become grid items. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Container + items model** — set `display: grid` on the parent; direct children automatically become grid items. [S1]
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- **Define columns on the container** — `grid-template-columns` controls how many columns and their widths (e.g., `auto auto auto` for three equal columns). [S1]
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## 📖 세부 내용 (Details)
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The CSS Grid Layout Module offers a grid-based layout system, with rows and columns, making it easier to design web pages without having to use float or positioning. [S1]
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**Grid vs Flexbox**
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CSS Grid is used for two-dimensional layout, with rows AND columns. CSS Flexbox is used for one-dimensional layout, with rows OR columns. [S1]
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**Grid Components**
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A grid consists of two essential parts: [S1]
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1. **Grid Container** — the parent element where `display` is set to `grid` or `inline-grid`.
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2. **Grid Items** — direct children of the grid container that automatically become grid items.
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**Complete example** [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: grid;
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grid-template-columns: auto auto auto;
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background-color: dodgerblue;
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padding: 10px;
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}
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.container div {
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background-color: #f1f1f1;
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border: 1px solid black;
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padding: 10px;
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font-size: 30px;
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text-align: center;
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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>1</div>
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<div>2</div>
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<div>3</div>
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<div>4</div>
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<div>5</div>
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</div>
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</body>
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</html>
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```
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The page also lists a CSS Grid properties table covering grid-related properties such as `grid-template-columns`, `grid-template-rows`, `gap`, `grid-area`, `justify-content`, and `align-items`, each with a brief description of its functionality. The full property-by-property table text was not captured verbatim from the source.
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## 🛠️ 적용 사례 (Applied in summary)
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The page's own complete example styles a `.container` with `display: grid` and `grid-template-columns: auto auto auto`, plus styled child `<div>` items. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Make a three-column grid container (language: CSS):
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```css
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.container {
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display: grid;
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grid-template-columns: auto auto auto;
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}
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```
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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- **CSS Grid** — two-dimensional layout, controlling rows AND columns together. [S1]
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- **CSS Flexbox** — one-dimensional layout, controlling rows OR columns. [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:** 0.89
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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 Grid Container]], [[CSS Grid Tracks]], [[CSS Grid Gaps]]
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- **참조 맥락:** The entry point referenced whenever building two-dimensional row-and-column page layouts.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Grid Intro — https://www.w3schools.com/css/css_grid.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Grid Intro" page (Astra wiki-curation, P-Reinforce v3.1 format).
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