koriweb
9609c04755
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>
102 lines
4.1 KiB
Markdown
102 lines
4.1 KiB
Markdown
---
|
|
id: css-background-image
|
|
title: "CSS Background Image"
|
|
category: "Frontend"
|
|
status: "draft"
|
|
verification_status: "conceptual"
|
|
canonical_id: ""
|
|
aliases: ["background-image", "background image url", "CSS background image", "image background", "url() background"]
|
|
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", "image"]
|
|
raw_sources: ["https://www.w3schools.com/css/css_background_image.asp"]
|
|
applied_in: []
|
|
github_commit: ""
|
|
---
|
|
|
|
# [[CSS Background Image]]
|
|
|
|
## 🎯 한 줄 통찰 (One-line insight)
|
|
The `background-image` property sets an image as the background of an element, and by default the image is repeated so it covers the entire element. [S1]
|
|
|
|
## 🧠 핵심 개념 (Core concepts)
|
|
- **background-image** — specifies an image to use as the background of an element. [S1]
|
|
- **Default tiling** — by default, the image is repeated so it covers the entire element. [S1]
|
|
- **Image source** — the image is referenced with the `url()` function (e.g. `url("paper.gif")`). [S1]
|
|
- **Applies to any element** — a background image can be set on the whole page (`body`) or on a specific element such as a paragraph. [S1]
|
|
- **Readability matters** — when using a background image, use an image that does not disturb the text. [S1]
|
|
|
|
## 🧩 추출된 패턴 (Extracted patterns)
|
|
- **Page-wide vs element-scoped** — set `background-image` on `body` for the entire page, or on a specific selector (e.g. `p`) to scope it to that element. [S1]
|
|
- **Contrast check** — choose an image that keeps the overlaid text readable; busy images make text "hardly readable." [S1]
|
|
|
|
## 📖 세부 내용 (Details)
|
|
**Background Image**
|
|
The `background-image` property specifies an image to use as the background of an element. By default, the image is repeated so it covers the entire element. [S1]
|
|
|
|
The background image for a page can be set like this: [S1]
|
|
```css
|
|
body {
|
|
background-image: url("paper.gif");
|
|
}
|
|
```
|
|
|
|
> Note: When using a background image, use an image that does not disturb the text. The page shows a counter-example where a busy image makes "the text is hardly readable": [S1]
|
|
```css
|
|
body {
|
|
background-image: url("bgdesert.jpg");
|
|
}
|
|
```
|
|
|
|
The background image can also be set for specific elements, like the `<p>` element: [S1]
|
|
```css
|
|
p {
|
|
background-image: url("paper.gif");
|
|
}
|
|
```
|
|
|
|
The page's property reference table lists `background-image`, described as the property that sets the background image for an element. [S1]
|
|
|
|
## 🛠️ 적용 사례 (Applied in summary)
|
|
The CSS rules above are the page's own demonstration examples for `body` and `p`. No external project/commit applications found in the source.
|
|
|
|
## 💻 코드 패턴 (Code patterns)
|
|
Page background image (language: CSS):
|
|
```css
|
|
body {
|
|
background-image: url("paper.gif");
|
|
}
|
|
```
|
|
Element-scoped background image:
|
|
```css
|
|
p {
|
|
background-image: url("paper.gif");
|
|
}
|
|
```
|
|
|
|
## ⚖️ 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 Repeat]], [[CSS Background Attachment]], [[CSS Background Shorthand]], [[CSS Background Color]]
|
|
- **참조 맥락:** Referenced whenever an image is placed behind page or element content; pairs with background-repeat and background-position to control its tiling and placement.
|
|
|
|
## 📚 출처 (Sources)
|
|
- [S1] W3Schools — CSS Background Image — https://www.w3schools.com/css/css_background_image.asp
|
|
|
|
## 📝 변경 이력 (Change history)
|
|
- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Background Image" page (Astra wiki-curation, P-Reinforce v3.1 format).
|