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title

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]

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]

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):

selector {
  outline: <outline-width> <outline-style> <outline-color>;
}

Concrete example:

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).

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