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>

10_Wiki/Topic_CSS/CSS_Grid_Container.md

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+---
+id: css-grid-container
+title: "CSS Grid Container"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["grid container", "display grid", "display inline-grid", "grid parent element", "grid container properties"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.86
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["css", "web", "frontend", "w3schools", "grid", "container"]
+raw_sources: ["https://www.w3schools.com/css/css_grid_container.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CSS Grid Container]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+A grid container contains one or more grid items arranged in columns and rows; an element becomes a grid container by setting `display` to `grid` or `inline-grid`, and all its direct children automatically become grid items. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Grid container definition** — a grid container contains one or more grid items arranged in columns and rows. [S1]
+- **Automatic grid items** — all direct child elements of a grid container automatically become grid items. [S1]
+- **Two display modes** — set `display: grid` (block-level) or `display: inline-grid` (inline) to make the container. [S1]
+- **Container-level properties** — alignment and sizing are controlled by container properties such as `justify-content`, `align-content`, `align-items`, `grid-template-columns`, `grid-template-rows`, `column-gap`, `row-gap`, `gap`, and `place-content`. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Declare the container first** — set `display: grid` (or `inline-grid`) before any grid-template or alignment property takes effect. [S1]
+- **Alignment lives on the container** — `justify-content` aligns items horizontally; `align-content` aligns them vertically inside the container. [S1]
+
+## 📖 세부 내용 (Details)
+A grid container contains one or more grid items arranged in columns and rows. All direct child elements of a grid container automatically become grid items. An element becomes a grid container by setting the `display` property to `grid` or `inline-grid`. [S1]
+
+**Block-level grid** — use `display: grid` to make a block-level grid container. [S1]
+```css
+.container {
+  display: grid;
+}
+```
+
+**Inline grid** — use `display: inline-grid` to make an inline grid container. [S1]
+```css
+.container {
+  display: inline-grid;
+}
+```
+
+**Grid Container Properties** [S1]
+
+| Property | Description |
+|----------|-------------|
+| `align-content` | Vertically aligns the grid items inside the container |
+| `align-items` | Specifies the default alignment for items inside a flexbox or grid container |
+| `column-gap` | Specifies the gap between the columns |
+| `gap` | A shorthand property for the `row-gap` and the `column-gap` properties |
+| `grid-template-columns` | Specifies the size of the columns, and how many columns in a grid layout |
+| `grid-template-rows` | Specifies the size of the rows in a grid layout |
+| `justify-content` | Horizontally aligns the grid items inside the container |
+| `row-gap` | Specifies the gap between the grid rows |
+| `place-content` | A shorthand property for the `align-content` and the `justify-content` properties |
+
+The page also presents interactive "Try it Yourself" examples demonstrating `justify-content` and `align-content` with various values; the literal CSS source for those alignment-value examples is only available behind the "Try it Yourself" buttons and was: Not found in source.
+
+## 🛠️ 적용 사례 (Applied in summary)
+The page's own examples apply `display: grid` and `display: inline-grid` to a `.container`. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Declare a grid container (language: CSS):
+```css
+.container {
+  display: grid; /* or inline-grid */
+}
+```
+
+## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
+- **`display: grid`** — makes a block-level grid container. [S1]
+- **`display: inline-grid`** — makes an inline grid container. [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:** 0.86
+- **중복 검사 결과:** 신규 생성 (New discovery). 일부 정렬 값 예제 코드는 출처에 인라인으로 표시되지 않음 (Not found in source).
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[CSS Tutorial]]
+- **관련 개념:** [[CSS Grid Intro]], [[CSS Grid Tracks]], [[CSS Grid Gaps]]
+- **참조 맥락:** Referenced whenever establishing the parent element of a grid and configuring its container-level alignment and sizing.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — CSS Grid Container — https://www.w3schools.com/css/css_grid_container.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Grid Container" page (Astra wiki-curation, P-Reinforce v3.1 format).