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title

W3CSS Web CSS Stylesheet

🎯 한 줄 통찰 (One-line insight)

This chapter shows that "becoming responsive" requires NOTHING beyond the skeleton's single empty <link> tag being filled in — the exact same three-image w3-row/w3-third markup that would be static/unresponsive as plain HTML instantly becomes responsive the moment w3.css is linked, meaning the ONLY thing separating a static layout from a responsive one in this crash course is which stylesheet URL fills that one blank. [S1]

🧠 핵심 개념 (Core concepts)

Activating the skeleton — filling the previous chapter's empty <link rel="stylesheet" href=""> with https://www.w3schools.com/w3css/5/w3.css. [S1]
Class-driven styling — once linked, elements only become styled once given a w3-* class (e.g. w3-container w3-black); linking alone changes nothing visually until classes are added. [S1]
Responsive image row — w3-row + three w3-third columns, each containing a 100%-width image, automatically responsive with zero additional CSS. [S1]
Business card composition — w3-card + fixed pixel width + a centered w3-container combines earlier Cards-chapter knowledge into a concrete "advanced" milestone example. [S1]

📖 세부 내용 (Details)

Completing the skeleton's stylesheet link: <link rel="stylesheet" href="https://www.w3schools.com/w3css/5/w3.css">. [S1]
Styling requires an explicit class even after linking: <div class="w3-container w3-black"><h1>This is a Heading</h1></div>. [S1]
Responsive 3-image row: <div class="w3-row"><div class="w3-third"><img src="img_avatar.png" style="width:100%"></div><div class="w3-third">...</div><div class="w3-third">...</div></div>. [S1]
Business card: <div class="w3-card" style="width:200px"><img src="img_avatar.png" style="width:100%"><div class="w3-container w3-center"><p class="w3-xlarge">John Doe</p><p>Engineer</p></div></div>. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

현재까지 발견된 모순 사항 없음 (No contradictions found in available sources).

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 3개 이미지를 w3-third로 나란히 배치하는 것만으로 반응형 레이아웃을 얻는 패턴이 스켈레톤에 스타일시트를 연결하는 실전 첫걸음이다. [S1]

💻 코드 패턴 (Code patterns)

A responsive 3-column image row requiring zero extra CSS once w3.css is linked (HTML):

<div class="w3-row">
  <div class="w3-third"><img src="img_avatar.png" style="width:100%"></div>
  <div class="w3-third"><img src="img_avatar.png" style="width:100%"></div>
  <div class="w3-third"><img src="img_avatar.png" style="width:100%"></div>
</div>

✅ 검증 상태 및 신뢰도

상태: draft
검증 단계: conceptual
출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
신뢰 점수: 0.84
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: W3.CSS Tutorial
관련 개념: W3CSS Web HTML, W3CSS Cards, W3CSS Web JavaScript
참조 맥락: 스켈레톤에 스타일시트 연결하기 — JavaScript 라이브러리 연결(Web JavaScript) 챕터로 이어짐.

📚 출처 (Sources)

[S1] W3Schools — Using a CSS Stylesheet — https://www.w3schools.com/w3css/w3css_web_css.asp

📝 변경 이력 (Change history)

2026-07-04: Initial draft synthesized from the W3Schools "Using a CSS Stylesheet" page (Astra wiki-curation, P-Reinforce v3.1 format).

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