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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

4.3 KiB

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title

CSS Background Attachment

🎯 한 줄 통찰 (One-line insight)

The background-attachment property specifies whether a background image is fixed (does not scroll with the rest of the page) or scroll (scrolls along with the page). [S1]

🧠 핵심 개념 (Core concepts)

background-attachment — specifies whether the background image should scroll or be fixed. [S1]
fixed — the background image will not scroll with the rest of the page; it stays in place relative to the viewport. [S1]
scroll — the background image scrolls with the rest of the page. [S1]
Combines with other background properties — typically set alongside background-image, background-repeat, and background-position. [S1]

🧩 추출된 패턴 (Extracted patterns)

Anchored backdrop — use fixed to keep an image stationary while content scrolls over it. [S1]
Flowing backdrop — use scroll so the image moves together with the page content. [S1]

📖 세부 내용 (Details)

background-attachment: fixed Specify that the background image should be fixed (will not scroll with the rest of the page): [S1]

body {
  background-image: url("img_tree.png");
  background-repeat: no-repeat;
  background-position: right top;
  background-attachment: fixed;
}

background-attachment: scroll Specify that the background image should scroll with the rest of the page: [S1]

body {
  background-image: url("img_tree.png");
  background-repeat: no-repeat;
  background-position: right top;
  background-attachment: scroll;
}

Property reference (from the page table): [S1]

Property	Description
`background-attachment`	Sets whether a background image is fixed or scrolls with the rest of the page

🛠️ 적용 사례 (Applied in summary)

The CSS rules above are the page's own demonstration examples on body. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Fixed (stationary) background (language: CSS):

body {
  background-image: url("img_tree.png");
  background-repeat: no-repeat;
  background-position: right top;
  background-attachment: fixed;
}

Scrolling background:

body {
  background-image: url("img_tree.png");
  background-repeat: no-repeat;
  background-position: right top;
  background-attachment: scroll;
}

⚖️ 비교 및 선택 기준 (Comparison & decision criteria)

fixed vs scroll — fixed keeps the background image stationary (does not scroll with the rest of the page), while scroll makes the image scroll together with the page content. [S1]

⚖️ 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 Image, CSS Background Repeat, CSS Background Shorthand, CSS Background Color
참조 맥락: Referenced when deciding whether a background image stays put or moves as the user scrolls.

📚 출처 (Sources)

[S1] W3Schools — CSS Background Attachment — https://www.w3schools.com/css/css_background_attachment.asp

📝 변경 이력 (Change history)

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

4.3 KiB Raw Blame History