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Antigravity Agent e9cbf23ab5 docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합

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- Topic_Programming 최종 문서 수: 2784 → 3985.

2026-07-05 00:39:13 +09:00

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title

W3CSS Images

🎯 한 줄 통찰 (One-line insight)

w3-image scales DOWN but never scales UP beyond the image's original size — a deliberate one-directional responsiveness distinct from style="width:100%" (which scales both up and down), meaning w3-image is the right choice specifically when you want a photo to shrink gracefully on small screens without ever appearing artificially blown-up/pixelated on large ones. [S1]

🧠 핵심 개념 (Core concepts)

w3-round / w3-circle / w3-border — reused shape/border classes apply directly to <img>. [S1]
w3-image — responsive: scales DOWN to fit container, never scales UP past original size. [S1]
style="width:100%" — scales both up AND down (fully fluid), unlike w3-image. [S1]
w3-opacity / w3-opacity-min / w3-opacity-max — three opacity intensity tiers. [S1]
w3-grayscale / w3-sepia (with -min/-max variants) — visual filter effects; NOT supported in IE11 and earlier. [S1]
w3-hover-opacity / w3-hover-grayscale / w3-hover-sepia — effects applied only on hover. [S1]
w3-hover-opacity-off — the inverse: an already-transparent image (w3-opacity) becomes FULLY opaque on hover, rather than the more common "transparent on hover" pattern. [S1]
Photo album via Responsive Grid — w3-third + w3-card + <img style="width:100%"> + w3-container caption, repeated for a gallery layout. [S1]

📖 세부 내용 (Details)

Never-scale-up responsive image: <img src="img_lights.jpg" alt="Lights" class="w3-image">. [S1]
Fully fluid (scales both ways): <img src="img_lights.jpg" alt="Lights" style="width:100%">. [S1]
Grayscale (not IE11-safe): <img src="image.jpg" class="w3-grayscale">. [S1]
Inverse hover effect: <img src="snowtops.jpg" class="w3-opacity w3-hover-opacity-off" alt="Alps"> — starts transparent, becomes fully opaque on hover. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

grayscale/sepia의 브라우저 제약: w3-grayscale과 w3-sepia 클래스 모두 IE11 이하에서 지원되지 않는다는 점이 각각 명시적으로 경고됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — Responsive Grid(w3-third)로 구성한 사진 앨범이 반응형 이미지 갤러리의 대표 실전 사례다. [S1]

💻 코드 패턴 (Code patterns)

Image that fades in on hover, from transparent to fully opaque (HTML):

<img src="snowtops.jpg" class="w3-opacity w3-hover-opacity-off" alt="Alps">

✅ 검증 상태 및 신뢰도

상태: draft
검증 단계: conceptual
출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
신뢰 점수: 0.89
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: W3.CSS Tutorial
관련 개념: W3CSS Lists, W3CSS Input, W3CSS Effects
참조 맥락: 이미지 반응형/효과 — 입력 폼(Input) 챕터로 이어짐.

📚 출처 (Sources)

[S1] W3Schools — W3.CSS Images — https://www.w3schools.com/w3css/w3css_images.asp

📝 변경 이력 (Change history)

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

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