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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-effects W3CSS Effects Programming_Language draft conceptual
w3-opacity
w3-grayscale
w3-sepia
hover effects
W3.CSS 이펙트
B 0.86 2026-07-04 2026-07-04
w3css
css-framework
w3schools
effects
hover
https://www.w3schools.com/w3css/w3css_effects.asp

W3CSS Effects

🎯 한 줄 통찰 (One-line insight)

Effect classes and color classes are designed to STACK, not replace each other — combining w3-hover-opacity with any w3-hover-<color> class (e.g. w3-hover-red) produces a lighter/softer version of that hover color, meaning the effects system was built as a compositional layer on top of the existing color system rather than a standalone feature. [S1]

🧠 핵심 개념 (Core concepts)

  • Opacity tiersw3-opacity-min (0.75), w3-opacity (0.6), w3-opacity-max (0.25) — three fixed transparency levels, no arbitrary values. [S1]
  • Grayscale tiersw3-grayscale-min (50%), w3-grayscale (75%), w3-grayscale-max (100%) — not supported in IE 11 and earlier. [S1]
  • Sepia tiersw3-sepia-min (50%), w3-sepia (75%), w3-sepia-max (100%) — also not supported in IE 11 and earlier. [S1]
  • Hover variantsw3-hover-opacity, w3-hover-grayscale, w3-hover-sepia — apply the effect only on mouse-over, not by default. [S1]
  • Stacking hover-opacity with hover-color — combining w3-hover-opacity with a w3-hover-<color> class softens/lightens that hover color. [S1]

📖 세부 내용 (Details)

  • Three opacity tiers on images: <img src="image.jpg" class="w3-opacity-min"><img src="image.jpg" class="w3-opacity"><img src="image.jpg" class="w3-opacity-max">. [S1]
  • Hover-only effects: <img src="image.jpg" class="w3-hover-opacity"><img src="image.jpg" class="w3-hover-grayscale"><img src="image.jpg" class="w3-hover-sepia">. [S1]
  • Combined hover color + opacity: <div class="w3-border w3-hover-opacity w3-hover-red"><p>w3-hover-red with w3-hover-opacity</p></div> — produces a lighter red on hover than w3-hover-red alone. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

  • IE 11 호환성 경고: w3-grayscale 계열과 w3-sepia 계열 클래스 모두 IE 11 이하 버전에서 지원되지 않는다고 원문에 명시됨 — 구형 브라우저 지원이 필요한 프로젝트에서는 주의 필요. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — hover-opacity와 hover-color를 조합해 부드러운 호버 색상을 만드는 조합 기법이 실전 UI 디테일 작업의 대표 활용 사례다. [S1]

💻 코드 패턴 (Code patterns)

Stacking hover-opacity with a hover-color class for a softened hover effect (HTML/CSS):

<div class="w3-border w3-hover-opacity w3-hover-red">
  <p>w3-hover-red with w3-hover-opacity</p>
</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: 0.86
  • 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 Effects" page (Astra wiki-curation, P-Reinforce v3.1 format).