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koriweb 9609c04755 docs(10_Wiki): W3Schools 위키화 — HTML/CSS/JavaScript(core)

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>

2026-06-23 19:21:18 +09:00

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title

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]

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]

body {
  background-image: url("bgdesert.jpg");
}

The background image can also be set for specific elements, like the <p> element: [S1]

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):

body {
  background-image: url("paper.gif");
}

Element-scoped background image:

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).

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