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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>
117 lines
4.2 KiB
Markdown
117 lines
4.2 KiB
Markdown
---
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id: css-outline-offset
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title: "CSS Outline Offset"
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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: ["outline-offset", "outline offset", "outline spacing", "transparent outline gap", "negative outline offset"]
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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", "outline", "outline-offset"]
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raw_sources: ["https://www.w3schools.com/css/css_outline_offset.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Outline Offset]]
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## 🎯 한 줄 통찰 (One-line insight)
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The `outline-offset` property adds transparent space between an element's outline and its border/edge, and accepts negative values to pull the outline inside the border. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Purpose** — `outline-offset` creates space between an element's outline and its border/edge. [S1]
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- **Transparent space** — the space created remains transparent. [S1]
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- **Positive values** — push the outline outward, away from the border. [S1]
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- **Negative values** — place the outline inside the border edge. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Outward gap pattern** — combine `outline` with a positive `outline-offset` to float the outline away from the border. [S1]
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- **Inward inset pattern** — use a negative `outline-offset` (e.g., `-5px`) to draw the outline inside the element's border. [S1]
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- **Reveal-the-gap pattern** — apply a `background` so the transparent offset space between border and outline is visible. [S1]
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## 📖 세부 내용 (Details)
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The `outline-offset` property creates space between an element's outline and its border/edge. This space remains transparent. [S1]
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**Example 1 — Positive offset:** creates a red outline 15px outside the border. [S1]
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```css
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p {
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margin: 30px;
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padding: 5px;
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border: 1px solid black;
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outline: 3px solid red;
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outline-offset: 15px;
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}
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```
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**Example 2 — With background:** demonstrates the transparent space between border and outline. [S1]
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```css
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p {
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margin: 30px;
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padding: 5px;
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background: yellow;
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border: 1px solid black;
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outline: 3px solid red;
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outline-offset: 15px;
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}
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```
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**Example 3 — Negative offset:** places the outline inside the border edge using a negative value. [S1]
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```css
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p {
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margin: 30px;
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padding: 5px;
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background: yellow;
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border: 1px solid black;
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outline: 3px solid red;
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outline-offset: -5px;
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}
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```
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**Related outline properties** listed on the page: `outline`, `outline-color`, `outline-offset`, `outline-style`, and `outline-width`. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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The page's own examples are the applied cases: a positive 15px offset, the same with a yellow background to expose the transparent gap, and a negative −5px offset placing the outline inside the border. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Offset pattern (language: CSS):
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```css
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selector {
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outline: <width> <style> <color>;
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outline-offset: <length>;
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}
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```
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Concrete example:
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```css
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p {
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outline: 3px solid red;
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outline-offset: 15px;
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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 Outline Shorthand]], [[CSS Outline]], [[CSS Border]]
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- **참조 맥락:** Referenced when fine-tuning the gap between an outline and the element's border, including drawing the outline inside the border.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Outline Offset — https://www.w3schools.com/css/css_outline_offset.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Outline Offset" page (Astra wiki-curation, P-Reinforce v3.1 format).
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