---
id: css-outline-offset
title: "CSS Outline Offset"
category: "Frontend"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["outline-offset", "outline offset", "outline spacing", "transparent outline gap", "negative outline offset"]
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", "outline", "outline-offset"]
raw_sources: ["https://www.w3schools.com/css/css_outline_offset.asp"]
applied_in: []
github_commit: ""
---

# [[CSS Outline Offset]]

## 🎯 한 줄 통찰 (One-line insight)
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]

## 🧠 핵심 개념 (Core concepts)
- **Purpose** — `outline-offset` creates space between an element's outline and its border/edge. [S1]
- **Transparent space** — the space created remains transparent. [S1]
- **Positive values** — push the outline outward, away from the border. [S1]
- **Negative values** — place the outline inside the border edge. [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **Outward gap pattern** — combine `outline` with a positive `outline-offset` to float the outline away from the border. [S1]
- **Inward inset pattern** — use a negative `outline-offset` (e.g., `-5px`) to draw the outline inside the element's border. [S1]
- **Reveal-the-gap pattern** — apply a `background` so the transparent offset space between border and outline is visible. [S1]

## 📖 세부 내용 (Details)
The `outline-offset` property creates space between an element's outline and its border/edge. This space remains transparent. [S1]

**Example 1 — Positive offset:** creates a red outline 15px outside the border. [S1]
```css
p {
  margin: 30px;
  padding: 5px;
  border: 1px solid black;
  outline: 3px solid red;
  outline-offset: 15px;
}
```

**Example 2 — With background:** demonstrates the transparent space between border and outline. [S1]
```css
p {
  margin: 30px;
  padding: 5px;
  background: yellow;
  border: 1px solid black;
  outline: 3px solid red;
  outline-offset: 15px;
}
```

**Example 3 — Negative offset:** places the outline inside the border edge using a negative value. [S1]
```css
p {
  margin: 30px;
  padding: 5px;
  background: yellow;
  border: 1px solid black;
  outline: 3px solid red;
  outline-offset: -5px;
}
```

**Related outline properties** listed on the page: `outline`, `outline-color`, `outline-offset`, `outline-style`, and `outline-width`. [S1]

## 🛠️ 적용 사례 (Applied in summary)
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.

## 💻 코드 패턴 (Code patterns)
Offset pattern (language: CSS):
```css
selector {
  outline: <width> <style> <color>;
  outline-offset: <length>;
}
```
Concrete example:
```css
p {
  outline: 3px solid red;
  outline-offset: 15px;
}
```

## ⚖️ 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 Outline Shorthand]], [[CSS Outline]], [[CSS Border]]
- **참조 맥락:** Referenced when fine-tuning the gap between an outline and the element's border, including drawing the outline inside the border.

## 📚 출처 (Sources)
- [S1] W3Schools — CSS Outline Offset — https://www.w3schools.com/css/css_outline_offset.asp

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