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id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit
id title category status verification_status canonical_id aliases duplicate_of source_trust_level confidence_score created_at updated_at review_reason merge_history tags raw_sources applied_in github_commit
w3css-containers W3CSS Containers Programming_Language draft conceptual
w3-container
W3.CSS 컨테이너
B 0.9 2026-07-04 2026-07-04
w3css
css-framework
w3schools
containers
https://www.w3schools.com/w3css/w3css_containers.asp

W3CSS Containers

🎯 한 줄 통찰 (One-line insight)

w3-container is explicitly called "the most important" W3.CSS class precisely because it works IDENTICALLY across semantic and non-semantic elements — the source proves there's "no difference in the way W3.CSS treats <div> and <header> elements," meaning developers can freely choose semantic HTML tags without losing any W3.CSS styling behavior. [S1]

🧠 핵심 개념 (Core concepts)

  • w3-container — adds 16px LEFT and RIGHT padding only (no top/bottom padding by default). [S1]
  • Element-agnostic — works identically on <div>, <header>, <footer>, <article>, <section>, <nav>, <blockquote>, <form>. [S1]
  • Equality across containers — provides common margins, paddings, alignments, fonts, and colors regardless of which tag is used. [S1]
  • No vertical padding needed normally — paragraph/heading margins already simulate the visual spacing that top/bottom padding would otherwise provide. [S1]

📖 세부 내용 (Details)

  • Basic container: <div class="w3-container"><p>The w3-container class is an important w3.CSS class.</p></div>. [S1]
  • Semantic header equivalence: <header class="w3-container w3-teal"><h1>Header</h1></header> behaves identically to <div class="w3-container w3-teal"><h1>Header</h1></div>. [S1]
  • No default vertical padding: <div class="w3-container w3-blue">I have no top or bottom padding.</div>. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

  • 시맨틱 태그와 div의 완전한 동등성: W3.CSS가 header/footer/article/section 등 시맨틱 태그와 div를 완전히 동일하게 취급한다는 점이 명시적으로 증명됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — header/article/footer로 구성된 전체 웹페이지 예제가 시맨틱 요소 활용의 대표 사례다. [S1]

💻 코드 패턴 (Code patterns)

Semantic elements styled identically to divs via w3-container (HTML):

<header class="w3-container w3-teal"><h1>Header</h1></header>
<article class="w3-container"><p>Content...</p></article>
<footer class="w3-container w3-teal"><h5>Footer</h5></footer>

검증 상태 및 신뢰도

  • 상태: draft
  • 검증 단계: conceptual
  • 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
  • 신뢰 점수: 0.90
  • 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

📚 출처 (Sources)

📝 변경 이력 (Change history)

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