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W3Schools 튜토리얼을 P-Reinforce v3.1 포맷으로 위키화(영어 본문, 한/영 섹션 헤더). - Topic_HTML: 59문서 (튜토리얼+예제, 레퍼런스/메타 제외) - Topic_CSS: 190문서 (메인 + Advanced/Flexbox/Grid/RWD 전체) - Topic_JavaScript: 120문서 (코어 언어; Temporal/DOM상세/BOM/WebAPI/AJAX/jQuery/Graphics 등은 후속) 각 폴더 00_INDEX.md(MOC) 포함. 코드 verbatim, 미확인분은 "Not found in source" 표기. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
94 lines
4.8 KiB
Markdown
94 lines
4.8 KiB
Markdown
---
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id: css-image-hover
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title: "CSS Image Hover Overlays"
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category: "Frontend"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["image overlay", "hover overlay", "fade overlay", "slide overlay", "image hover effect"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.85
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created_at: 2026-06-23
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updated_at: 2026-06-23
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review_reason: ""
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merge_history: []
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tags: ["css", "web", "frontend", "w3schools", "images", "hover"]
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raw_sources: ["https://www.w3schools.com/css/css3_images_hover.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Image Hover Overlays]]
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## 🎯 한 줄 통찰 (One-line insight)
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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]
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## 🧠 핵심 개념 (Core concepts)
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- **Overlay on hover** — the goal is to create an overlay effect on hover that reveals text or a colored box over the image. [S1]
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- **Fade effects** — the overlay can fade in text, or fade in a box, when the image is hovered. [S1]
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- **Slide effects** — the overlay can also slide in from the top, bottom, left, or right. [S1]
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- **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]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Hidden-then-revealed overlay** — place an overlay element over the image, keep it hidden, and flip it on the container's `:hover`. [S1]
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- **Direction by initial offset** — slide effects differ by which dimension/offset starts collapsed (top/bottom/left/right) and grows on hover. [S1]
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## 📖 세부 내용 (Details)
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**Overlay image hover effects**
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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]
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1. Fade in text
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2. Fade in a box
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3. Slide in (top)
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4. Slide in (bottom)
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5. Slide in (left)
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6. Slide in (right)
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**Implementation pattern (described)**
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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]
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**Code availability**
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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]
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## 🛠️ 적용 사례 (Applied in summary)
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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.
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## 💻 코드 패턴 (Code patterns)
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Conceptual overlay-reveal skeleton, grounded in the page's described pattern (exact W3Schools values Not found in source):
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```css
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.overlay {
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opacity: 0;
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transition: opacity 0.5s;
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background-color: /* overlay color */;
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}
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.container:hover .overlay {
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opacity: 1;
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}
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```
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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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]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source. Note: full per-example CSS was not available inline (marked "Not found in source").
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.85
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[CSS Tutorial]]
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- **관련 개념:** [[CSS Image Effects]], [[CSS Image Modal]], [[CSS Transitions]], [[CSS Opacity]]
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- **참조 맥락:** Referenced when adding interactive captions or reveal effects to images in galleries and cards.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Image Hover Overlays — https://www.w3schools.com/css/css3_images_hover.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Image Hover Overlays" page (Astra wiki-curation, P-Reinforce v3.1 format).
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