---
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).