---
id: css-outline-shorthand
title: "CSS Outline Shorthand"
category: "Frontend"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["outline shorthand", "outline property", "CSS outline", "outline-width outline-style outline-color", "outline border-radius"]
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", "shorthand"]
raw_sources: ["https://www.w3schools.com/css/css_outline_shorthand.asp"]
applied_in: []
github_commit: ""
---

# [[CSS Outline Shorthand]]

## 🎯 한 줄 통찰 (One-line insight)
The `outline` property is a shorthand that sets `outline-width`, `outline-style`, and `outline-color` in a single declaration, with values allowed in any order. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Shorthand for three properties** — `outline` combines `outline-width`, `outline-style` (required), and `outline-color`. [S1]
- **Flexible value count** — one, two, or three values can be specified. [S1]
- **Order-independent** — values can be specified in any order. [S1]
- **Style is required** — `outline-style` must be present for the outline to render. [S1]
- **Works with rounded corners** — outlines can be combined with `border-radius` to create custom styled effects around elements. [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **Compact declaration pattern** — replace three separate `outline-*` declarations with a single `outline: <width> <style> <color>;`. [S1]
- **Style-only minimum** — `outline: dashed;` is valid because style is the only required component. [S1]
- **Rounded-outline composition** — pair `outline` with `border-radius` on the same selector to round the outline. [S1]

## 📖 세부 내용 (Details)
The `outline` property serves as shorthand for three individual properties: `outline-width`, `outline-style` (required), and `outline-color`. Values can be specified in any order, with one, two, or three values allowed. [S1]

**Example 1 — Basic shorthand:** [S1]
```css
p.ex1 {outline: dashed;}
p.ex2 {outline: dotted red;}
p.ex3 {outline: 7px solid yellow;}
p.ex4 {outline: thick ridge pink;}
```

**Example 2 — With rounded corners:** outlines work with rounded corners using `border-radius` to create custom styled outline effects around elements. [S1]
```css
p.ex1 {
  outline: dashed;
  border-radius: 8px;
}

p.ex2 {
  outline: dotted red;
  border-radius: 5px;
}

p.ex3 {
  outline: 7px solid yellow;
  border-radius: 5px;
}

p.ex4 {
  outline: thick ridge pink;
  border-radius: 8px;
}

p.ex5 {
  outline: thick solid green;
  border-radius: 10px;
}
```

## 🛠️ 적용 사례 (Applied in summary)
The page's own examples are the applied cases: basic shorthand declarations and shorthand combined with `border-radius` for rounded outlines. No external project/commit applications found in the source.

## 💻 코드 패턴 (Code patterns)
Shorthand pattern (language: CSS):
```css
selector {
  outline: <outline-width> <outline-style> <outline-color>;
}
```
Concrete example:
```css
p.ex3 {outline: 7px solid yellow;}
```

## ⚖️ 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 Offset]], [[CSS Outline]], [[CSS Border]]
- **참조 맥락:** Referenced when writing concise outline declarations instead of separate outline-width/style/color rules.

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

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