docs(10_Wiki): W3Schools 위키화 — HTML/CSS/JavaScript(core)
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>
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id: css-background-clip
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title: "CSS Background Clip"
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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: ["background-clip", "background painting area", "border-box clip", "padding-box clip", "content-box clip", "background extent"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.88
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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", "background", "background-clip"]
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raw_sources: ["https://www.w3schools.com/css/css3_background_clip.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Background Clip]]
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## 🎯 한 줄 통찰 (One-line insight)
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The `background-clip` property defines how far the background (color, image, or gradient) extends within an element — behind the border (default), to the inside edge of the border, or only to the content box. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`background-clip`** — defines how far the background (color, image, or gradient) should extend within an element. [S1]
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- **`border-box`** — the background extends behind the border; this is the default. [S1]
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- **`padding-box`** — the background extends to the inside edge of the border. [S1]
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- **`content-box`** — the background extends to the edge of the content box. [S1]
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- **Applies to color and image** — the same values work whether the background is a color or an image. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Clip-extent pattern** — the value sets the outer boundary of the painted area: `border-box` → `padding-box` → `content-box` progressively shrinks where the background shows. [S1]
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- **Border-reveal pattern** — with a dotted/transparent border, switching to `padding-box` or `content-box` makes the background stop short of (and reveal gaps in) the border area. [S1]
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## 📖 세부 내용 (Details)
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**CSS `background-clip` Property**
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The `background-clip` property defines how far the background (color, image, or gradient) should extend within an element. [S1]
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The property takes three different values: [S1]
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- `border-box` — the background extends behind the border. This is default. [S1]
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- `padding-box` — the background extends to the inside edge of the border. [S1]
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- `content-box` — the background extends to the edge of the content box. [S1]
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Example — `background-clip` with a background image: [S1]
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```css
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#div1 {
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border: 5px dotted black;
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padding: 35px;
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background-image: url(paper.gif);
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background-clip: border-box;
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}
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#div2 {
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border: 5px dotted black;
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padding: 35px;
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background-image: url(paper.gif);
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background-clip: padding-box;
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}
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#div3 {
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border: 5px dotted black;
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padding: 35px;
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background-image: url(paper.gif);
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background-clip: content-box;
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}
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```
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Example — `background-clip` with a background color: [S1]
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```css
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#div1 {
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border: 5px dotted black;
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padding: 35px;
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background-color: lightblue;
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background-clip: border-box;
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}
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#div2 {
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border: 5px dotted black;
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padding: 35px;
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background-color: lightblue;
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background-clip: padding-box;
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}
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#div3 {
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border: 5px dotted black;
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padding: 35px;
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background-color: lightblue;
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background-clip: content-box;
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}
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```
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**CSS Background Properties**
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| Property | Description |
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|----------|-------------|
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| `background` | A shorthand property for setting all the background properties in one declaration |
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| `background-clip` | Specifies the painting area of the background |
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| `background-image` | Specifies one or more background images for an element |
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| `background-origin` | Specifies where the background image(s) is/are positioned |
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| `background-size` | Specifies the size of the background image(s) |
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[S1]
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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Choosing the clip extent (paint boundary): [S1]
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- **`border-box`** (default) — background paints all the way behind the border; useful so a dotted/transparent border shows the background through its gaps.
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- **`padding-box`** — background stops at the inner edge of the border, leaving the border area unpainted.
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- **`content-box`** — background paints only within the content box, leaving both border and padding areas unpainted.
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Note `background-clip` controls the painted area, whereas [[CSS Background Origin]] controls the image's starting position. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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The page's two example sets (the same dotted-border, padded box with `border-box`/`padding-box`/`content-box` applied to a background image and then to a background color) are the applied cases. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Clip the background color to the content box (language: CSS):
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```css
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selector {
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border: 5px dotted black;
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padding: 35px;
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background-color: lightblue;
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background-clip: content-box;
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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:** 0.88
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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 Background Origin]], [[CSS Background Size]], [[CSS Multiple Backgrounds]]
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- **참조 맥락:** Referenced when controlling whether a background shows behind the border, only inside it, or only within the content area.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Background Clip — https://www.w3schools.com/css/css3_background_clip.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Background Clip" page (Astra wiki-curation, P-Reinforce v3.1 format).
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