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-optimization
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title: "CSS Optimization"
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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: ["CSS performance", "CSS optimization", "faster CSS", "CSS minification", "render performance"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.87
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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", "performance", "optimization", "rendering"]
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raw_sources: ["https://www.w3schools.com/css/css_performance.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Optimization]]
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## 🎯 한 줄 통찰 (One-line insight)
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Optimizing CSS makes a website load faster and run more smoothly — keep selectors simple, avoid layout-thrashing work, animate cheap properties, and serve external, minified, cached stylesheets. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Why optimize** — optimizing CSS makes your website load faster and run more smoothly, which results in a better user experience. [S1]
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- **Parsing cost** — complex selectors increase parsing time, so simpler selectors are faster. [S1]
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- **Rendering cost** — broad selectors (like the universal selector) and certain animated properties force more work during rendering. [S1]
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- **Delivery cost** — how CSS is loaded, combined, minified, and cached affects load time. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Simplest-selector pattern** — prefer a short selector such as `.button:hover` over a deeply nested one. [S1]
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- **Cheap-animation pattern** — animate properties that don't cause repaint/reflow (transforms, opacity, filter) instead of layout-triggering properties. [S1]
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- **One-file delivery pattern** — combine into a single external CSS file, minify it, and cache it with a long expiration time. [S1]
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## 📖 세부 내용 (Details)
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Optimizing CSS makes your website load faster and run more smoothly, which also results in a better user experience. The page presents nine optimization strategies. [S1]
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**1. Use Simple Selectors.** Use simple selectors when possible; complex selectors increase the parsing time. The "bad" approach uses a deeply nested selector, while the better approach uses just `.button:hover`. [S1]
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**2. Avoid the Universal Selector.** Avoid the universal selector (`*`) when not strictly necessary — it affects every element and can slow down page rendering. [S1]
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**3. Avoid Inline Styles.** Avoid inline styles when not necessary; inline styles make your HTML heavier and are harder to manage. [S1]
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**4. Avoid `@import`.** Avoid using `@import` for loading external CSS, as it delays stylesheet loading. Use the `<link>` tag in the `<head>` section instead. [S1]
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**5. Use Shorthand Properties.** Use shorthand properties when possible — it saves space and is faster to parse. For example, use `margin: 10px 20px;` instead of writing each margin property individually. [S1]
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```css
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margin: 10px 20px;
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```
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**6. Cut Down Unnecessary Animations.** A high number of animations and large animations require more processing power to handle, which degrades performance. [S1]
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**7. Use Properties That Don't Cause Repaint.** Animation performance relies also on what properties you are animating. Properties like transforms, opacity, and filter are recommended over layout-triggering properties. [S1]
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**8. Combine and Minify CSS.** Use one CSS file when possible, and remove spaces and comments to reduce file size. [S1]
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**9. Cache Your CSS.** Make sure your CSS file is cached by the browser by giving it a long expiration time in your server settings. [S1]
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**Summary.** Keep selectors short and simple; avoid layout-thrashing operations; use efficient animation techniques; and use external, minified, and cached stylesheets. [S1]
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(Note: the exact "bad" vs "good" verbatim code boxes for tips 1–4 and 6–9 were not captured verbatim from the source beyond the shorthand `margin` example and the `.button:hover` reference. — Not found in source.)
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## 🛠️ 적용 사례 (Applied in summary)
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The page's applied guidance contrasts a deeply nested selector against the simpler `.button:hover`, and replaces individual margin declarations with the shorthand `margin: 10px 20px;`. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Shorthand over longhand (language: CSS):
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```css
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/* Preferred — shorthand */
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margin: 10px 20px;
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```
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Simple selector over a nested chain (language: CSS):
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```css
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/* Preferred — short and simple */
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.button:hover { /* ... */ }
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```
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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:** 0.87
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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 Selectors]], [[CSS Math Functions]], [[CSS Accessibility]]
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- **참조 맥락:** Consulted when a page's CSS is slow to parse, render, or download and needs tuning for performance.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Optimization — https://www.w3schools.com/css/css_performance.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Optimization" page (Astra wiki-curation, P-Reinforce v3.1 format).
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