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10_Wiki/Topic_Programming/Topic_CSS/CSS_Outline_Offset.md

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+---
+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).