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Antigravity Agent e9cbf23ab5 docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합

이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영.

- Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들
  (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거.
- Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/
  Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/
  Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이
  존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존).
- Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/
  JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동.
- 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리.
- Topic_Programming 최종 문서 수: 2784 → 3985.

2026-07-05 00:39:13 +09:00

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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).

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