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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---
id: css-rwd-intro
title: "CSS RWD Intro"
category: "Frontend"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["responsive web design", "RWD", "responsive design intro", "mobile friendly design", "responsive layout", "RWD introduction"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.85
created_at: 2026-06-23
updated_at: 2026-06-23
review_reason: ""
merge_history: []
tags: ["css", "web", "frontend", "w3schools", "responsive", "rwd"]
raw_sources: ["https://www.w3schools.com/css/css_rwd_intro.asp"]
applied_in: []
github_commit: ""
---
# [[CSS RWD Intro]]
## 🎯 한 줄 통찰 (One-line insight)
Responsive web design is about creating web pages that look good on all devices, using HTML and CSS to automatically resize, hide, shrink, or enlarge a website so it adapts to desktops, tablets, and mobile phones. [S1]
## 🧠 핵심 개념 (Core concepts)
- **Responsive web design** — about creating web pages that look good on all devices. [S1]
- **HTML + CSS** — RWD uses HTML and CSS to automatically resize, hide, shrink, or enlarge a website, to make it look good on all devices. [S1]
- **Device coverage** — targets desktops, tablets, and mobile phones. [S1]
- **Essential elements** — the viewport `<meta>` tag, flexible layout (grid and flex), and media queries. [S1]
## 🧩 추출된 패턴 (Extracted patterns)
- **Adapt, do not duplicate** — one set of HTML/CSS resizes and rearranges itself per device, rather than maintaining separate sites. [S1]
- **Three-pillar foundation** — the viewport meta tag, a flexible layout (grid/flex), and media queries together enable responsiveness. [S1]
## 📖 세부 내용 (Details)
Responsive web design is about creating web pages that look good on all devices. Responsive design involves using HTML and CSS to automatically resize, hide, shrink, or enlarge a website, to make it look good on all devices. [S1]
The page identifies three essential RWD elements: the viewport `<meta>` tag, a flexible layout (grid and flex), and media queries. It also references three device categories — desktops, tablets, and mobile phones — with accompanying device illustrations. [S1]
**RWD tutorial chapters** [S1]
- RWD Intro
- RWD Viewport
- RWD Grid View
- RWD Media Queries
- RWD Images
- RWD Videos
- RWD Frameworks
- RWD Templates
**Code examples:** No inline CSS/HTML code snippets appear in this introductory page; demonstrations are referenced only as "Try it Yourself" interactive examples. Inline source code: Not found in source. [S1]
## 🛠️ 적용 사례 (Applied in summary)
This is an introductory overview chapter; it lists the topics the RWD tutorial will cover (viewport, grid view, media queries, images, videos, frameworks, templates) rather than presenting an applied implementation. No external project/commit applications found in the source.
## 💻 코드 패턴 (Code patterns)
Not found in source — the RWD introduction page presents no inline code; concrete code patterns appear in the later RWD chapters (Viewport, Grid View, Media Queries). [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:** 0.85 (개요 페이지 — 인라인 코드 없음, Not found in source)
- **중복 검사 결과:** 신규 생성 (New discovery)
## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[CSS Tutorial]]
- **관련 개념:** [[CSS Grid 12-column Layout]], [[CSS @supports]], [[CSS Grid Align]]
- **참조 맥락:** The entry point to the responsive web design track, preceding viewport, grid-view, and media-query chapters.
## 📚 출처 (Sources)
- [S1] W3Schools — CSS RWD Intro — https://www.w3schools.com/css/css_rwd_intro.asp
## 📝 변경 이력 (Change history)
- 2026-06-23: Initial draft synthesized from the W3Schools "CSS RWD Intro" page (Astra wiki-curation, P-Reinforce v3.1 format).