2nd/10_Wiki/Topic_CSS/CSS_Border_Width.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-width	CSS Border Width	Frontend	draft	conceptual		border-width CSS border width border thickness thin medium thick border border size		B	0.9	2026-06-23	2026-06-23			css web frontend w3schools border border-width	https://www.w3schools.com/css/css_border_width.asp

CSS Border Width

🎯 한 줄 통찰 (One-line insight)

The border-width property sets the thickness of a border, accepting either a specific size (px, pt, cm, em) or one of three predefined keywords — thin, medium, or thick — and like other border properties it takes one to four values for the individual sides. [S1]

🧠 핵심 개념 (Core concepts)

• border-width specifies the width of the four borders. [S1]
• Specific size — the width can be set as a specific size in px, pt, cm, em, etc. [S1]
• Keyword values — alternatively, three predefined values are allowed: thin, medium, or thick. [S1]
• Per-side values — the property can take from one to four values (for the top border, right border, bottom border, and the left border). [S1]
• Requires border-style — width is only visible when a border-style is also set. [S1]

🧩 추출된 패턴 (Extracted patterns)

• Size or keyword — choose either an explicit length unit or a relative keyword (thin/medium/thick) per border. [S1]
• One-to-four value box model — a single declaration can give every side a different width (e.g. 25px 10px 4px 35px). [S1]

📖 세부 내용 (Details)

Border Width [S1] The border-width property specifies the width of the four borders.

The width can be set as a specific size (in px, pt, cm, em, etc.) or by using one of the three pre-defined values: thin, medium, or thick. [S1]

Example — mixing specific sizes and keyword values across paragraph classes: [S1]

p.one {
  border-style: solid;
  border-width: 5px;
}

p.two {
  border-style: solid;
  border-width: medium;
}

p.three {
  border-style: dotted;
  border-width: 2px;
}

p.four {
  border-style: dotted;
  border-width: thick;
}

Specific Side Widths [S1] The border-width property can have from one to four values (for the top border, right border, bottom border, and the left border).

Example — supplying multiple values for individual sides: [S1]

p.one {
  border-style: solid;
  border-width: 5px 20px; /* 5px top and bottom, 20px on the sides */
}

p.two {
  border-style: solid;
  border-width: 20px 5px; /* 20px top and bottom, 5px on the sides */
}

p.three {
  border-style: solid;
  border-width: 25px 10px 4px 35px; /* 25px top, 10px right, 4px bottom and 35px left */
}

🛠️ 적용 사례 (Applied in summary)

The page's own applied examples are the paragraph-class stylesheets above: one demonstrating size vs. keyword widths and one demonstrating two-value and four-value per-side widths. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Single width for all sides (language: CSS):

p.one {
  border-style: solid;
  border-width: 5px;
}

Per-side widths, four values (top, right, bottom, left):

p.three {
  border-style: solid;
  border-width: 25px 10px 4px 35px; /* 25px top, 10px right, 4px bottom and 35px left */
}

⚖️ 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: 0.90
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: CSS Tutorial
• 관련 개념: CSS Border Style, CSS Border Color, CSS Border Sides, CSS Border Shorthand
• 참조 맥락: Used together with border-style whenever a border's thickness needs to be controlled.

📚 출처 (Sources)

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

📝 변경 이력 (Change history)

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