---
id: css-overflow-x-and-y
title: "CSS Overflow X and Y"
category: "Frontend"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["overflow-x", "overflow-y", "CSS overflow xy", "horizontal overflow", "vertical overflow", "directional overflow"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.87
created_at: 2026-06-23
updated_at: 2026-06-23
review_reason: ""
merge_history: []
tags: ["css", "web", "frontend", "w3schools", "overflow", "layout"]
raw_sources: ["https://www.w3schools.com/css/css_overflow_xy.asp"]
applied_in: []
github_commit: ""
---

# [[CSS Overflow X and Y]]

## 🎯 한 줄 통찰 (One-line insight)
`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]

## 🧠 핵심 개념 (Core concepts)
- **overflow-x** — specifies what to do with the left/right edges of the content. [S1]
- **overflow-y** — specifies what to do with the top/bottom edges of the content. [S1]
- **independent control** — the two properties allow managing layout more precisely than using the general `overflow` property alone. [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **Asymmetric scrolling** — combine different values per axis (e.g. `overflow-x: hidden; overflow-y: scroll;`) when horizontal and vertical content should behave differently. [S1]
- **Single-axis scroll regions** — wide tables and code blocks use `overflow-x: auto`; chat feeds use `overflow-y: scroll`. [S1]

## 📖 세부 내용 (Details)
**Core concepts** [S1]
`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.

**Example 1 — hide horizontal, add vertical scrollbar** [S1]
```css
div {
  overflow-x: hidden;
  overflow-y: scroll;
}
```

**Example 2 — horizontal scrollbar only** [S1]
```css
div {
  overflow-x: scroll;
  overflow-y: hidden;
}
```

**Common use cases** [S1]
1. **Horizontal scrolling table** — use `overflow-x: auto` for wide data tables.
2. **Chat windows** — use `overflow-y: scroll` for vertical message feeds.
3. **Code blocks** — use `overflow-x: auto` to accommodate lengthy code lines.

These directional properties provide granular control when different scroll behavior is needed for horizontal versus vertical content overflow.

## 🛠️ 적용 사례 (Applied in summary)
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.

## 💻 코드 패턴 (Code patterns)
Vertical scroll, no horizontal overflow (language: CSS):
```css
div {
  overflow-x: hidden;
  overflow-y: scroll;
}
```

Horizontal scroll, no vertical overflow (language: CSS):
```css
div {
  overflow-x: scroll;
  overflow-y: hidden;
}
```

## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
- **overflow (shorthand)** — applies the same behavior to both axes. [S1]
- **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]

## ⚖️ 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:** 0.87
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[CSS Tutorial]]
- **관련 개념:** [[CSS Overflow]], [[CSS Position Fixed and Absolute]], [[CSS Float]]
- **참조 맥락:** Referenced when a container needs different overflow behavior on the horizontal versus the vertical axis.

## 📚 출처 (Sources)
- [S1] W3Schools — CSS Overflow X and Y — https://www.w3schools.com/css/css_overflow_xy.asp

## 📝 변경 이력 (Change history)
- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Overflow X and Y" page (Astra wiki-curation, P-Reinforce v3.1 format).