docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합
이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영. - Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들 (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거. - Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/ Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/ Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이 존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존). - Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/ JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동. - 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리. - Topic_Programming 최종 문서 수: 2784 → 3985.
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Antigravity Agent
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id: css-grid-items
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title: "CSS Grid Items"
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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: ["grid-column", "grid-row", "grid-column-start", "grid-column-end", "grid item span", "CSS grid lines", "grid-area"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.9
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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_item.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Grid Items]]
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## 🎯 한 줄 통찰 (One-line insight)
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All direct children of a grid container automatically become grid items, and each item can span multiple columns or rows by referencing column-lines and row-lines through `grid-column-start/end` and `grid-row-start/end` (or their shorthands). [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Grid items** — a grid container contains one or more grid items; all direct child elements of a grid container automatically become grid items. [S1]
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- **Spanning** — a grid item can span over multiple columns or rows by specifying where it starts and ends. [S1]
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- **Grid lines** — the lines between the columns are called column-lines, and the lines between the rows are called row-lines; line numbers are used to place a grid item in the container. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Line-number placement** — set `grid-column-start`/`grid-column-end` (and the row equivalents) to numeric line indices to place and size an item. [S1]
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- **`/ span N` shorthand** — `grid-column: 1 / span 2;` starts at a line and spans a number of tracks instead of naming the end line. [S1]
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- **Combined placement** — apply both `grid-column` and `grid-row` to a single item to span across both axes simultaneously. [S1]
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## 📖 세부 내용 (Details)
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**Grid items**
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A grid container contains one or more grid items. All direct child elements of a grid container automatically become grid items. A grid item can span over multiple columns or rows; we specify where to start and end a grid item by using placement properties. The lines between the columns in a grid are called column-lines, and the lines between the rows in a grid are called row-lines. We can refer to line numbers when placing a grid item in a grid container. [S1]
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**Properties for placing grid items** [S1]
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| Property | Purpose |
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|----------|---------|
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| `grid-column-start` | Specifies on which column-line the grid item will start |
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| `grid-column-end` | Specifies on which column-line the grid item will end |
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| `grid-column` | Shorthand property for `grid-column-start` and `grid-column-end` |
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| `grid-row-start` | Specifies on which row-line the grid item will start |
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| `grid-row-end` | Specifies on which row-line the grid item will end |
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| `grid-row` | Shorthand property for `grid-row-start` and `grid-row-end` |
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Using `grid-column-start` and `grid-column-end` to make an item start at column-line 1 and end at column-line 3: [S1]
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```css
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.item1 {
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grid-column-start: 1;
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grid-column-end: 3;
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}
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```
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The same result with the `grid-column` shorthand using `/ span`: [S1]
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```css
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.item1 {
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grid-column: 1 / span 2;
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}
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```
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Using `grid-row-start` and `grid-row-end` to make an item start at row-line 1 and end at row-line 3: [S1]
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```css
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.item1 {
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grid-row-start: 1;
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grid-row-end: 3;
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}
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```
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The same result with the `grid-row` shorthand using `/ span`: [S1]
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```css
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.item1 {
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grid-row: 1 / span 2;
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}
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```
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Combining `grid-column` and `grid-row` so the item spans two columns and two rows: [S1]
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```css
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.item1 {
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grid-column: 1 / span 2;
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grid-row: 1 / span 2;
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}
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```
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**Complete CSS Grid Item properties reference** [S1]
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| Property | Description |
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|----------|-------------|
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| `align-self` | Aligns the content for a specific grid item along the column axis |
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| `grid-area` | Shorthand property for `grid-row-start`, `grid-column-start`, `grid-row-end` and `grid-column-end` |
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| `grid-column` | Shorthand property for `grid-column-start` and `grid-column-end` |
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| `grid-column-end` | Specifies where to end the grid item |
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| `grid-column-start` | Specifies where to start the grid item |
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| `grid-row` | Shorthand property for `grid-row-start` and `grid-row-end` |
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| `grid-row-end` | Specifies where to end the grid item |
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| `grid-row-start` | Specifies where to start the grid item |
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| `justify-self` | Aligns the content for a specific grid item along the row axis |
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| `place-self` | Shorthand property for `align-self` and `justify-self` |
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## 🛠️ 적용 사례 (Applied in summary)
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The page's own examples are the applied cases: placing `.item1` by explicit start/end lines, by `/ span` shorthand, and spanning both columns and rows at once. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Explicit line placement (language: CSS):
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```css
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.item1 {
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grid-column-start: 1;
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grid-column-end: 3;
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}
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```
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Span shorthand:
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```css
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.item1 {
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grid-column: 1 / span 2;
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}
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```
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Span across both axes:
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```css
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.item1 {
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grid-column: 1 / span 2;
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grid-row: 1 / span 2;
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}
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```
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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:** 0.9
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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 Align]], [[CSS Grid Item Named]], [[CSS Grid Item Align]], [[CSS Grid Item Order]]
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- **참조 맥락:** How individual children are positioned and sized within a grid layout.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Grid Items — https://www.w3schools.com/css/css_grid_item.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Grid Items" page (Astra wiki-curation, P-Reinforce v3.1 format).
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