docs(10_Wiki): 위키 구조 정리 — 언어 튜토리얼 카테고리 폴더 제거 + 신규 자산 동기화

Topic_CSS/Topic_HTML/Topic_JavaScript/Topic_Prompt/Topic_Comfyui 등 기존 카테고리 폴더를 정리하고, Topic_Graphic/Dev 등 신규 산출물과 Topics 내부 세션/메모리 기록을 동기화.
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+---
+id: css-background-image
+title: "CSS Background Image"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["background-image", "background image url", "CSS background image", "image background", "url() background"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["css", "web", "frontend", "w3schools", "background", "image"]
+raw_sources: ["https://www.w3schools.com/css/css_background_image.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CSS Background Image]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The `background-image` property sets an image as the background of an element, and by default the image is repeated so it covers the entire element. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **background-image** — specifies an image to use as the background of an element. [S1]
+- **Default tiling** — by default, the image is repeated so it covers the entire element. [S1]
+- **Image source** — the image is referenced with the `url()` function (e.g. `url("paper.gif")`). [S1]
+- **Applies to any element** — a background image can be set on the whole page (`body`) or on a specific element such as a paragraph. [S1]
+- **Readability matters** — when using a background image, use an image that does not disturb the text. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Page-wide vs element-scoped** — set `background-image` on `body` for the entire page, or on a specific selector (e.g. `p`) to scope it to that element. [S1]
+- **Contrast check** — choose an image that keeps the overlaid text readable; busy images make text "hardly readable." [S1]
+
+## 📖 세부 내용 (Details)
+**Background Image**
+The `background-image` property specifies an image to use as the background of an element. By default, the image is repeated so it covers the entire element. [S1]
+
+The background image for a page can be set like this: [S1]
+```css
+body {
+  background-image: url("paper.gif");
+}
+```
+
+> Note: When using a background image, use an image that does not disturb the text. The page shows a counter-example where a busy image makes "the text is hardly readable": [S1]
+```css
+body {
+  background-image: url("bgdesert.jpg");
+}
+```
+
+The background image can also be set for specific elements, like the `<p>` element: [S1]
+```css
+p {
+  background-image: url("paper.gif");
+}
+```
+
+The page's property reference table lists `background-image`, described as the property that sets the background image for an element. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+The CSS rules above are the page's own demonstration examples for `body` and `p`. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Page background image (language: CSS):
+```css
+body {
+  background-image: url("paper.gif");
+}
+```
+Element-scoped background image:
+```css
+p {
+  background-image: url("paper.gif");
+}
+```
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+No contradictions found in the 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:** 0.88
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[CSS Tutorial]]
+- **관련 개념:** [[CSS Background Repeat]], [[CSS Background Attachment]], [[CSS Background Shorthand]], [[CSS Background Color]]
+- **참조 맥락:** Referenced whenever an image is placed behind page or element content; pairs with background-repeat and background-position to control its tiling and placement.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — CSS Background Image — https://www.w3schools.com/css/css_background_image.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Background Image" page (Astra wiki-curation, P-Reinforce v3.1 format).