2nd/10_Wiki/Topic_CSS/CSS_Background_Clip.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
css-background-clip	CSS Background Clip	Frontend	draft	conceptual		background-clip background painting area border-box clip padding-box clip content-box clip background extent		B	0.88	2026-06-23	2026-06-23			css web frontend w3schools background background-clip	https://www.w3schools.com/css/css3_background_clip.asp

CSS Background Clip

🎯 한 줄 통찰 (One-line insight)

The background-clip property defines how far the background (color, image, or gradient) extends within an element — behind the border (default), to the inside edge of the border, or only to the content box. [S1]

🧠 핵심 개념 (Core concepts)

• background-clip — defines how far the background (color, image, or gradient) should extend within an element. [S1]
• border-box — the background extends behind the border; this is the default. [S1]
• padding-box — the background extends to the inside edge of the border. [S1]
• content-box — the background extends to the edge of the content box. [S1]
• Applies to color and image — the same values work whether the background is a color or an image. [S1]

🧩 추출된 패턴 (Extracted patterns)

• Clip-extent pattern — the value sets the outer boundary of the painted area: border-box → padding-box → content-box progressively shrinks where the background shows. [S1]
• Border-reveal pattern — with a dotted/transparent border, switching to padding-box or content-box makes the background stop short of (and reveal gaps in) the border area. [S1]

📖 세부 내용 (Details)

CSS background-clip Property The background-clip property defines how far the background (color, image, or gradient) should extend within an element. [S1]

The property takes three different values: [S1]

• border-box — the background extends behind the border. This is default. [S1]
• padding-box — the background extends to the inside edge of the border. [S1]
• content-box — the background extends to the edge of the content box. [S1]

Example — background-clip with a background image: [S1]

#div1 {
  border: 5px dotted black;
  padding: 35px;
  background-image: url(paper.gif);
  background-clip: border-box;
}

#div2 {
  border: 5px dotted black;
  padding: 35px;
  background-image: url(paper.gif);
  background-clip: padding-box;
}

#div3 {
  border: 5px dotted black;
  padding: 35px;
  background-image: url(paper.gif);
  background-clip: content-box;
}

Example — background-clip with a background color: [S1]

#div1 {
  border: 5px dotted black;
  padding: 35px;
  background-color: lightblue;
  background-clip: border-box;
}

#div2 {
  border: 5px dotted black;
  padding: 35px;
  background-color: lightblue;
  background-clip: padding-box;
}

#div3 {
  border: 5px dotted black;
  padding: 35px;
  background-color: lightblue;
  background-clip: content-box;
}

CSS Background Properties

Property	Description
background	A shorthand property for setting all the background properties in one declaration
background-clip	Specifies the painting area of the background
background-image	Specifies one or more background images for an element
background-origin	Specifies where the background image(s) is/are positioned
background-size	Specifies the size of the background image(s)

[S1]

⚖️ 비교 및 선택 기준 (Comparison & decision criteria)

Choosing the clip extent (paint boundary): [S1]

• border-box (default) — background paints all the way behind the border; useful so a dotted/transparent border shows the background through its gaps.
• padding-box — background stops at the inner edge of the border, leaving the border area unpainted.
• content-box — background paints only within the content box, leaving both border and padding areas unpainted. Note background-clip controls the painted area, whereas CSS Background Origin controls the image's starting position. [S1]

🛠️ 적용 사례 (Applied in summary)

The page's two example sets (the same dotted-border, padded box with border-box/padding-box/content-box applied to a background image and then to a background color) are the applied cases. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Clip the background color to the content box (language: CSS):

selector {
  border: 5px dotted black;
  padding: 35px;
  background-color: lightblue;
  background-clip: content-box;
}

⚖️ 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 Origin, CSS Background Size, CSS Multiple Backgrounds
• 참조 맥락: Referenced when controlling whether a background shows behind the border, only inside it, or only within the content area.

📚 출처 (Sources)

• [S1] W3Schools — CSS Background Clip — https://www.w3schools.com/css/css3_background_clip.asp

📝 변경 이력 (Change history)

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