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-overflow-x-and-y
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title: "CSS Overflow X and Y"
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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: ["overflow-x", "overflow-y", "CSS overflow xy", "horizontal overflow", "vertical overflow", "directional overflow"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.87
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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", "overflow", "layout"]
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raw_sources: ["https://www.w3schools.com/css/css_overflow_xy.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Overflow X and Y]]
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## 🎯 한 줄 통찰 (One-line insight)
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`overflow-x` and `overflow-y` control overflow independently per axis — the horizontal (left/right) edges and the vertical (top/bottom) edges — giving finer control than the single `overflow` shorthand. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **overflow-x** — specifies what to do with the left/right edges of the content. [S1]
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- **overflow-y** — specifies what to do with the top/bottom edges of the content. [S1]
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- **independent control** — the two properties allow managing layout more precisely than using the general `overflow` property alone. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Asymmetric scrolling** — combine different values per axis (e.g. `overflow-x: hidden; overflow-y: scroll;`) when horizontal and vertical content should behave differently. [S1]
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- **Single-axis scroll regions** — wide tables and code blocks use `overflow-x: auto`; chat feeds use `overflow-y: scroll`. [S1]
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## 📖 세부 내용 (Details)
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**Core concepts** [S1]
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`overflow-x` and `overflow-y` control how content overflows independently in each direction. `overflow-x` specifies what to do with the left/right edges of the content; `overflow-y` specifies what to do with the top/bottom edges of the content. These allow developers to manage layout more precisely than using the general `overflow` property alone.
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**Example 1 — hide horizontal, add vertical scrollbar** [S1]
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```css
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div {
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overflow-x: hidden;
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overflow-y: scroll;
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}
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```
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**Example 2 — horizontal scrollbar only** [S1]
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```css
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div {
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overflow-x: scroll;
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overflow-y: hidden;
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}
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```
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**Common use cases** [S1]
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1. **Horizontal scrolling table** — use `overflow-x: auto` for wide data tables.
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2. **Chat windows** — use `overflow-y: scroll` for vertical message feeds.
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3. **Code blocks** — use `overflow-x: auto` to accommodate lengthy code lines.
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These directional properties provide granular control when different scroll behavior is needed for horizontal versus vertical content overflow.
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## 🛠️ 적용 사례 (Applied in summary)
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The page applies the properties to a `div`: hiding horizontal overflow while scrolling vertically, and scrolling horizontally while hiding vertical overflow. Listed real-world uses are horizontally scrolling tables, vertically scrolling chat windows, and horizontally scrolling code blocks. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Vertical scroll, no horizontal overflow (language: CSS):
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```css
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div {
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overflow-x: hidden;
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overflow-y: scroll;
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}
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```
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Horizontal scroll, no vertical overflow (language: CSS):
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```css
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div {
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overflow-x: scroll;
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overflow-y: hidden;
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}
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```
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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- **overflow (shorthand)** — applies the same behavior to both axes. [S1]
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- **overflow-x / overflow-y** — set behavior per axis independently; choose these when horizontal and vertical content should scroll or clip differently (e.g. wide tables, chat feeds, code blocks). [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:** 0.87
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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 Overflow]], [[CSS Position Fixed and Absolute]], [[CSS Float]]
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- **참조 맥락:** Referenced when a container needs different overflow behavior on the horizontal versus the vertical axis.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Overflow X and Y — https://www.w3schools.com/css/css_overflow_xy.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Overflow X and Y" page (Astra wiki-curation, P-Reinforce v3.1 format).
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