docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합
이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영. - Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들 (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거. - Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/ Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/ Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이 존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존). - Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/ JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동. - 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리. - Topic_Programming 최종 문서 수: 2784 → 3985.
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Antigravity Agent
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id: css-box-sizing
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title: "CSS Box Sizing"
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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: ["box-sizing", "border-box", "content-box", "CSS box model sizing", "include padding border in width"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.89
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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", "box-model", "layout"]
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raw_sources: ["https://www.w3schools.com/css/css3_box-sizing.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Box Sizing]]
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## 🎯 한 줄 통찰 (One-line insight)
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The `box-sizing` property controls whether an element's declared width/height include its padding and border, and setting it to `border-box` makes sizing predictable so padded boxes don't grow larger than intended. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Default behavior** — by default, an element's actual rendered width and height include the padding and border *added on top of* the specified `width`/`height`. [S1]
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- **The sizing formula (default)** — `width + padding + border = actual width of an element`, and `height + padding + border = actual height of an element`. [S1]
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- **The problem** — two divs with identical `width: 300px` / `height: 100px` appear different sizes if one has padding; the padded one is larger. [S1]
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- **The fix** — `box-sizing` lets you include padding and borders within the total declared width/height. [S1]
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- **Recommended default** — applying `box-sizing: border-box` to all elements via `*` makes layout sizing consistent. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **border-box pattern** — set `box-sizing: border-box;` so the declared width/height *contain* padding and border instead of being added to them. [S1]
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- **Universal reset pattern** — `* { box-sizing: border-box; }` applies predictable sizing to every element. [S1]
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## 📖 세부 내용 (Details)
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By default, the actual width and height of an element include the padding and borders added to the specified dimensions: [S1]
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- `width + padding + border = actual width of an element` [S1]
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- `height + padding + border = actual height of an element` [S1]
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This means two divs given the same `width` (300px) and `height` (100px) can appear different — the one with 50px padding is larger because the padding is added to the specified width/height. The `box-sizing` property solves this by allowing padding and borders to be included in the total width/height calculation. [S1]
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**Example 1 — without `box-sizing` (the problem)** [S1]
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```css
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.div1 {
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width: 300px;
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height: 100px;
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border: 1px solid blue;
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}
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.div2 {
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width: 300px;
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height: 100px;
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padding: 50px;
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border: 1px solid red;
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}
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```
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**Example 2 — with `box-sizing: border-box` (the solution)** [S1]
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```css
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.div1 {
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width: 300px;
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height: 100px;
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border: 1px solid blue;
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box-sizing: border-box;
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}
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.div2 {
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width: 300px;
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height: 100px;
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padding: 50px;
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border: 1px solid red;
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box-sizing: border-box;
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}
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```
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**Example 3 — recommended universal application** [S1]
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```css
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* {
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box-sizing: border-box;
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}
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```
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**Property reference** [S1]
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| Property | Description |
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|----------|-------------|
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| `box-sizing` | Defines how the width and height of an element are calculated: should they include padding and borders, or not |
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## 🛠️ 적용 사례 (Applied in summary)
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The page's applied examples contrast `.div1` and `.div2` first without `box-sizing` (they render at different sizes) and then with `box-sizing: border-box` (they render identically), and finally recommend the `* { box-sizing: border-box; }` universal reset. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Predictable element sizing (language: CSS):
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```css
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.box {
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width: 300px;
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height: 100px;
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padding: 50px;
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border: 1px solid red;
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box-sizing: border-box;
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}
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```
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Universal reset (language: CSS):
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```css
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* {
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box-sizing: border-box;
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}
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```
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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- **Default (content-box) sizing** — `width`/`height` describe only the content area; padding and border are added on top, so the rendered box is larger than the declared size. Use when you specifically want the content area to be a fixed size. [S1]
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- **`border-box` sizing** — padding and border are included within the declared `width`/`height`, so a `300px` box stays `300px` regardless of padding. The page recommends this (including applying it to all elements via `*`) for predictable layouts. [S1]
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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:** 0.89
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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 Box Model]], [[CSS Padding]], [[CSS Border]], [[CSS Width and Max-width]]
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- **참조 맥락:** Referenced whenever layout sizing must stay predictable across elements that carry padding or borders.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Box Sizing — https://www.w3schools.com/css/css3_box-sizing.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Box Sizing" page (Astra wiki-curation, P-Reinforce v3.1 format).
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