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-outline-shorthand
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title: "CSS Outline Shorthand"
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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 shorthand", "outline property", "CSS outline", "outline-width outline-style outline-color", "outline border-radius"]
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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", "shorthand"]
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raw_sources: ["https://www.w3schools.com/css/css_outline_shorthand.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Outline Shorthand]]
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## 🎯 한 줄 통찰 (One-line insight)
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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]
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## 🧠 핵심 개념 (Core concepts)
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- **Shorthand for three properties** — `outline` combines `outline-width`, `outline-style` (required), and `outline-color`. [S1]
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- **Flexible value count** — one, two, or three values can be specified. [S1]
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- **Order-independent** — values can be specified in any order. [S1]
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- **Style is required** — `outline-style` must be present for the outline to render. [S1]
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- **Works with rounded corners** — outlines can be combined with `border-radius` to create custom styled effects around elements. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Compact declaration pattern** — replace three separate `outline-*` declarations with a single `outline: <width> <style> <color>;`. [S1]
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- **Style-only minimum** — `outline: dashed;` is valid because style is the only required component. [S1]
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- **Rounded-outline composition** — pair `outline` with `border-radius` on the same selector to round the outline. [S1]
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## 📖 세부 내용 (Details)
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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]
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**Example 1 — Basic shorthand:** [S1]
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```css
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p.ex1 {outline: dashed;}
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p.ex2 {outline: dotted red;}
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p.ex3 {outline: 7px solid yellow;}
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p.ex4 {outline: thick ridge pink;}
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```
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**Example 2 — With rounded corners:** outlines work with rounded corners using `border-radius` to create custom styled outline effects around elements. [S1]
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```css
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p.ex1 {
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outline: dashed;
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border-radius: 8px;
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}
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p.ex2 {
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outline: dotted red;
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border-radius: 5px;
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}
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p.ex3 {
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outline: 7px solid yellow;
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border-radius: 5px;
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}
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p.ex4 {
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outline: thick ridge pink;
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border-radius: 8px;
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}
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p.ex5 {
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outline: thick solid green;
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border-radius: 10px;
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}
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```
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## 🛠️ 적용 사례 (Applied in summary)
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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.
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## 💻 코드 패턴 (Code patterns)
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Shorthand pattern (language: CSS):
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```css
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selector {
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outline: <outline-width> <outline-style> <outline-color>;
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}
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```
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Concrete example:
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```css
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p.ex3 {outline: 7px solid yellow;}
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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 Offset]], [[CSS Outline]], [[CSS Border]]
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- **참조 맥락:** Referenced when writing concise outline declarations instead of separate outline-width/style/color rules.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Outline Shorthand — https://www.w3schools.com/css/css_outline_shorthand.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Outline Shorthand" page (Astra wiki-curation, P-Reinforce v3.1 format).
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