---
id: css-background-attachment
title: "CSS Background Attachment"
category: "Frontend"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["background-attachment", "fixed background", "scroll background", "CSS background attachment", "fixed vs scroll"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.88
created_at: 2026-06-23
updated_at: 2026-06-23
review_reason: ""
merge_history: []
tags: ["css", "web", "frontend", "w3schools", "background", "background-attachment"]
raw_sources: ["https://www.w3schools.com/css/css_background_attachment.asp"]
applied_in: []
github_commit: ""
---

# [[CSS Background Attachment]]

## 🎯 한 줄 통찰 (One-line insight)
The `background-attachment` property specifies whether a background image is `fixed` (does not scroll with the rest of the page) or `scroll` (scrolls along with the page). [S1]

## 🧠 핵심 개념 (Core concepts)
- **background-attachment** — specifies whether the background image should scroll or be fixed. [S1]
- **fixed** — the background image will not scroll with the rest of the page; it stays in place relative to the viewport. [S1]
- **scroll** — the background image scrolls with the rest of the page. [S1]
- **Combines with other background properties** — typically set alongside `background-image`, `background-repeat`, and `background-position`. [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **Anchored backdrop** — use `fixed` to keep an image stationary while content scrolls over it. [S1]
- **Flowing backdrop** — use `scroll` so the image moves together with the page content. [S1]

## 📖 세부 내용 (Details)
**background-attachment: fixed**
Specify that the background image should be fixed (will not scroll with the rest of the page): [S1]
```css
body {
  background-image: url("img_tree.png");
  background-repeat: no-repeat;
  background-position: right top;
  background-attachment: fixed;
}
```

**background-attachment: scroll**
Specify that the background image should scroll with the rest of the page: [S1]
```css
body {
  background-image: url("img_tree.png");
  background-repeat: no-repeat;
  background-position: right top;
  background-attachment: scroll;
}
```

**Property reference (from the page table):** [S1]

| Property | Description |
|----------|-------------|
| `background-attachment` | Sets whether a background image is fixed or scrolls with the rest of the page |

## 🛠️ 적용 사례 (Applied in summary)
The CSS rules above are the page's own demonstration examples on `body`. No external project/commit applications found in the source.

## 💻 코드 패턴 (Code patterns)
Fixed (stationary) background (language: CSS):
```css
body {
  background-image: url("img_tree.png");
  background-repeat: no-repeat;
  background-position: right top;
  background-attachment: fixed;
}
```
Scrolling background:
```css
body {
  background-image: url("img_tree.png");
  background-repeat: no-repeat;
  background-position: right top;
  background-attachment: scroll;
}
```

## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
- **fixed vs scroll** — `fixed` keeps the background image stationary (does not scroll with the rest of the page), while `scroll` makes the image scroll together with the page content. [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:** 0.88
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[CSS Tutorial]]
- **관련 개념:** [[CSS Background Image]], [[CSS Background Repeat]], [[CSS Background Shorthand]], [[CSS Background Color]]
- **참조 맥락:** Referenced when deciding whether a background image stays put or moves as the user scrolls.

## 📚 출처 (Sources)
- [S1] W3Schools — CSS Background Attachment — https://www.w3schools.com/css/css_background_attachment.asp

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