2nd/10_Wiki/Topic_CSS/CSS_Border_Sides.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-border-sides	CSS Border Sides	Frontend	draft	conceptual		border sides CSS individual borders border-top-style border per side border value count		B	0.89	2026-06-23	2026-06-23			css web frontend w3schools border border-sides	https://www.w3schools.com/css/css_border_sides.asp

CSS Border Sides

🎯 한 줄 통찰 (One-line insight)

In CSS it is possible to specify a different border for each side of an element, either through individual side properties (e.g. border-top-style) or through the shorthand border-style whose number of values (1–4) determines how the sides are filled. [S1]

🧠 핵심 개념 (Core concepts)

• Different border per side — in CSS it is possible to specify a different border for each side. [S1]
• Individual side properties — border-top-style, border-right-style, border-bottom-style, and border-left-style each target one side. [S1]
• Shorthand value count — the border-style property can take one to four values, and the count controls which sides get which style. [S1]
• Same logic for width and color — the same value-count logic applies equally to border-width and border-color. [S1]

🧩 추출된 패턴 (Extracted patterns)

• Clockwise-from-top rule — four values map to top, right, bottom, left in clockwise order. [S1]
• Mirror fill — with two values, top/bottom share the first and right/left share the second; with three, the second value covers both right and left. [S1]

📖 세부 내용 (Details)

Borders - Individual Sides [S1] In CSS, it is also possible to specify a different border for each side.

Example — using the four individual side-style properties: [S1]

p {
  border-top-style: dotted;
  border-right-style: solid;
  border-bottom-style: dotted;
  border-left-style: solid;
}

The example above gives the same result as the shorthand below. [S1]

Shorthand: how the value count maps to sides [S1]

If the border-style property has four values: [S1]

border-style: dotted solid double dashed;

• top border is dotted
• right border is solid
• bottom border is double
• left border is dashed

If the border-style property has three values: [S1]

border-style: dotted solid double;

• top border is dotted
• right and left borders are solid
• bottom border is double

If the border-style property has two values: [S1]

border-style: dotted solid;

• top and bottom borders are dotted
• right and left borders are solid

If the border-style property has one value: [S1]

border-style: dotted;

• all four borders are dotted

The border-style property is used in the examples above. However, it also works with border-width and border-color. [S1]

🛠️ 적용 사례 (Applied in summary)

The page's own applied examples are the individual side-property stylesheet and the four shorthand declarations (one/two/three/four values) demonstrating each value-count mapping. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Individual side properties (language: CSS):

p {
  border-top-style: dotted;
  border-right-style: solid;
  border-bottom-style: dotted;
  border-left-style: solid;
}

Shorthand, four values (top, right, bottom, left):

border-style: dotted solid double dashed;

⚖️ 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: 0.89
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: CSS Tutorial
• 관련 개념: CSS Border Style, CSS Border Width, CSS Border Color, CSS Border Shorthand
• 참조 맥락: Explains the value-count box-model rule reused across all border (and margin/padding) shorthands.

📚 출처 (Sources)

• [S1] W3Schools — CSS Border Sides — https://www.w3schools.com/css/css_border_sides.asp

📝 변경 이력 (Change history)

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