2nd/10_Wiki/Topic_CSS/CSS_Image_Hover.md

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
css-image-hover	CSS Image Hover Overlays	Frontend	draft	conceptual		image overlay hover overlay fade overlay slide overlay image hover effect		B	0.85	2026-06-23	2026-06-23			css web frontend w3schools images hover	https://www.w3schools.com/css/css3_images_hover.asp

CSS Image Hover Overlays

🎯 한 줄 통찰 (One-line insight)

A hover overlay reveals hidden content over an image when the user hovers, either fading in (text or a box) or sliding in from the top, bottom, left, or right. [S1]

🧠 핵심 개념 (Core concepts)

• Overlay on hover — the goal is to create an overlay effect on hover that reveals text or a colored box over the image. [S1]
• Fade effects — the overlay can fade in text, or fade in a box, when the image is hovered. [S1]
• Slide effects — the overlay can also slide in from the top, bottom, left, or right. [S1]
• Reveal mechanism — the overlay element starts hidden (typically opacity: 0 or zero size) and a hover rule reveals it, with a transition for smoothness. [S1]

🧩 추출된 패턴 (Extracted patterns)

• Hidden-then-revealed overlay — place an overlay element over the image, keep it hidden, and flip it on the container's :hover. [S1]
• Direction by initial offset — slide effects differ by which dimension/offset starts collapsed (top/bottom/left/right) and grows on hover. [S1]

📖 세부 내용 (Details)

Overlay image hover effects The page demonstrates how to create an overlay effect on hover, revealing hidden content or a visual enhancement over an image. The examples, in order, are: [S1]

1. Fade in text
2. Fade in a box
3. Slide in (top)
4. Slide in (bottom)
5. Slide in (left)
6. Slide in (right)

Implementation pattern (described) The overlay pattern uses an overlay element with an initial opacity of 0 (invisible), a transition property for a smooth reveal, a background-color for the overlay layer, and a hover state that changes opacity to 1 (or adjusts dimensions for slide effects). [S1]

Code availability The detailed CSS for the .container, .image, .overlay, and .text classes — including the exact transition durations, opacity values, and positioning — is presented on the page only as "Try it Yourself" interactive examples and is Not found in source as inline code in the fetched content. The exact declaration blocks should not be invented; consult the W3Schools editor for verbatim code. [S1]

🛠️ 적용 사례 (Applied in summary)

The source's applied cases are the six hover-overlay demos (fade-in text, fade-in box, and four slide-in directions). The exact CSS for each is not reproduced here (Not found in source). No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Conceptual overlay-reveal skeleton, grounded in the page's described pattern (exact W3Schools values Not found in source):

.overlay {
  opacity: 0;
  transition: opacity 0.5s;
  background-color: /* overlay color */;
}

.container:hover .overlay {
  opacity: 1;
}

⚖️ 비교 및 선택 기준 (Comparison & decision criteria)

Per the source, choose fade effects (text or box) when you want the overlay to appear in place, and slide effects when you want it to enter from an edge; the four slide directions (top, bottom, left, right) differ only by which edge the overlay starts collapsed against and grows from on hover. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

No contradictions found in the source. Note: full per-example CSS was not available inline (marked "Not found in source").

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.85
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: CSS Tutorial
• 관련 개념: CSS Image Effects, CSS Image Modal, CSS Transitions, CSS Opacity
• 참조 맥락: Referenced when adding interactive captions or reveal effects to images in galleries and cards.

📚 출처 (Sources)

• [S1] W3Schools — CSS Image Hover Overlays — https://www.w3schools.com/css/css3_images_hover.asp

📝 변경 이력 (Change history)

• 2026-06-23: Initial draft synthesized from the W3Schools "CSS Image Hover Overlays" page (Astra wiki-curation, P-Reinforce v3.1 format).