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>
2026-06-23 19:21:18 +09:00
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+---
+id: css-position-offsets
+title: "CSS Position Offsets"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["position offsets", "top right bottom left", "CSS offsets", "positioned element offsets", "edge properties", "offset properties"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.87
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["css", "web", "frontend", "w3schools", "position", "layout"]
+raw_sources: ["https://www.w3schools.com/css/css_position_offset.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CSS Position Offsets]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The `top`, `right`, `bottom`, and `left` properties position elements — but they only take effect on positioned elements (those with `position` set to `relative`, `absolute`, `fixed`, or `sticky`). [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **offset properties** — `top`, `right`, `bottom`, and `left` are used to position elements. [S1]
+- **only on positioned elements** — these properties only work on positioned elements, i.e. elements with `position` set to `relative`, `absolute`, `fixed`, or `sticky`. [S1]
+- **margin-edge semantics** — each offset sets the corresponding margin edge for a positioned box (top/right/bottom/left margin edge). [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Positioned + offset** — set a `position` value other than `static` first, then use offset properties to move the element; offsets are ignored on static elements. [S1]
+- **Corner/center placement** — use combinations of offsets on an absolutely positioned element to place text at an image's corners or center. [S1]
+
+## 📖 세부 내용 (Details)
+**Positioning with top, right, bottom, and left** [S1]
+The `top`, `right`, `bottom`, and `left` properties are used to position elements. These properties only work on **positioned elements** (elements with `position` set to `relative`, `absolute`, `fixed`, or `sticky`).
+
+**Positioning Text On an Image** [S1]
+This section demonstrates practical application with an example showing text positioned at various corners and center of an image. The page provides five interactive "Try it Yourself" examples: Top Left, Top Right, Bottom Left, Bottom Right, and Centered. The exact verbatim CSS for each variant was not provided in the fetched source — Not found in source.
+
+**CSS Positioning Properties Reference Table** [S1]
+
+| Property | Description |
+|----------|-------------|
+| bottom | Sets the bottom margin edge for a positioned box |
+| clip | Clips an absolutely positioned element |
+| left | Sets the left margin edge for a positioned box |
+| position | Specifies the type of positioning for an element |
+| right | Sets the right margin edge for a positioned box |
+| top | Sets the top margin edge for a positioned box |
+
+## 🛠️ 적용 사례 (Applied in summary)
+The page's applied example is positioning text at the corners and center of an image using offset properties on positioned elements. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+General shape — offsets only apply once an element is positioned (language: CSS):
+```css
+selector {
+  position: absolute; /* or relative, fixed, sticky */
+  top: 0;
+  right: 0;
+  bottom: 0;
+  left: 0;
+}
+```
+Note: this skeleton illustrates the rule that offsets require a non-static `position`; the page did not provide verbatim per-corner example code — Not found in source. [S1]
+
+## ⚖️ 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:** 0.87
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[CSS Tutorial]]
+- **관련 개념:** [[CSS Position Fixed and Absolute]], [[CSS Position Sticky]], [[CSS Z-index]]
+- **참조 맥락:** Referenced whenever a positioned element must be moved using top/right/bottom/left offsets.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — CSS Position Offsets — https://www.w3schools.com/css/css_position_offset.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Position Offsets" page (Astra wiki-curation, P-Reinforce v3.1 format).