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title

W3CSS Responsive

🎯 한 줄 통찰 (One-line insight)

The s/m/l column-size prefixes CASCADE upward — specifying only s6 (small-screen 6-of-12) is enough for ALL screen sizes, while specifying only m6 (medium) leaves SMALL screens undefined and defaulting to 100% width — meaning you only need to declare the LARGEST breakpoint tier you want to differ from full-width, not every tier explicitly. [S1]

🧠 핵심 개념 (Core concepts)

12-column system — w3-col defines a column; s1-s12/m1-m12/l1-l12 set its width fraction for small/medium/large screens respectively (each unit ≈ 8.33%). [S1]
Cascading defaults — specifying only the small-screen class applies it everywhere; specifying only medium/large leaves small screens at 100% (full stack) unless also specified. [S1]
Columns per row must sum to 12 — e.g. 6+6, 3+3+6, 9+3 — a structural rule for the grid to add up correctly. [S1]
Mixed breakpoint combinations — a single column can combine l3 m6 s4 to have entirely different fractions at each screen tier simultaneously. [S1]
w3-hide-small / w3-hide-medium / w3-hide-large — hides content entirely at specific breakpoints (small <601px, large >992px). [S1]
w3-content — a centered, fixed-max-width container; override the default 980px via CSS max-width. [S1]

📖 세부 내용 (Details)

Mixed multi-tier layout: <div class="w3-col l3 m6 s4 w3-green">...</div><div class="w3-col l7 m3 s4 w3-dark-grey">...</div><div class="w3-col l2 m3 s4 w3-red">...</div> — produces 25%/58.34%/16.66% on large, 50%/25%/25% on medium, and 33.3% each on small screens, from ONE set of markup. [S1]
Centered content container: <body class="w3-content" style="max-width:500px">page content...</body>. [S1]
Hiding on specific breakpoints: <div class="w3-container w3-hide-small w3-red">...</div>. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

열 크기 클래스의 계단식 기본값: small 클래스만 지정하면 모든 화면에 적용되지만, medium/large만 지정하면 small 화면에서는 자동으로 100%가 된다는 점이 명시적으로 설명됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — l3/m6/s4처럼 화면별로 완전히 다른 비율을 하나의 마크업으로 표현하는 것이 반응형 그리드의 핵심 실전 활용이다. [S1]

💻 코드 패턴 (Code patterns)

One column with different width fractions per screen tier (HTML):

<div class="w3-row">
  <div class="w3-col l3 m6 s4 w3-green"><p>l3 m6 s4</p></div>
  <div class="w3-col l7 m3 s4 w3-dark-grey"><p>l7 m3 s4</p></div>
  <div class="w3-col l2 m3 s4 w3-red"><p>l2 m3 s4</p></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: 0.88
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: W3.CSS Tutorial
관련 개념: W3CSS Cells, W3CSS Rows, W3CSS Dark Mode
참조 맥락: Grid & Flexbox 섹션의 마지막 — 다크모드(Dark Mode) 챕터로 이어짐.

📚 출처 (Sources)

[S1] W3Schools — W3.CSS Responsive Fluid Grid — https://www.w3schools.com/w3css/w3css_responsive.asp

📝 변경 이력 (Change history)

2026-07-04: Initial draft synthesized from the W3Schools "W3.CSS Responsive Fluid Grid" page (Astra wiki-curation, P-Reinforce v3.1 format).

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