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title

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]

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]

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]

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):

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

Concrete example:

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).

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