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>
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id: css-border-width
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title: "CSS Border Width"
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category: "Frontend"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["border-width", "CSS border width", "border thickness", "thin medium thick border", "border size"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.9
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created_at: 2026-06-23
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updated_at: 2026-06-23
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review_reason: ""
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merge_history: []
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tags: ["css", "web", "frontend", "w3schools", "border", "border-width"]
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raw_sources: ["https://www.w3schools.com/css/css_border_width.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Border Width]]
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## 🎯 한 줄 통찰 (One-line insight)
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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]
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## 🧠 핵심 개념 (Core concepts)
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- **`border-width`** specifies the width of the four borders. [S1]
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- **Specific size** — the width can be set as a specific size in px, pt, cm, em, etc. [S1]
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- **Keyword values** — alternatively, three predefined values are allowed: `thin`, `medium`, or `thick`. [S1]
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- **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]
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- **Requires border-style** — width is only visible when a `border-style` is also set. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Size or keyword** — choose either an explicit length unit or a relative keyword (`thin`/`medium`/`thick`) per border. [S1]
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- **One-to-four value box model** — a single declaration can give every side a different width (e.g. `25px 10px 4px 35px`). [S1]
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## 📖 세부 내용 (Details)
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**Border Width** [S1]
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The `border-width` property specifies the width of the four borders.
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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]
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**Example** — mixing specific sizes and keyword values across paragraph classes: [S1]
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```css
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p.one {
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border-style: solid;
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border-width: 5px;
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}
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p.two {
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border-style: solid;
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border-width: medium;
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}
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p.three {
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border-style: dotted;
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border-width: 2px;
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}
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p.four {
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border-style: dotted;
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border-width: thick;
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}
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```
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**Specific Side Widths** [S1]
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The `border-width` property can have from one to four values (for the top border, right border, bottom border, and the left border).
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**Example** — supplying multiple values for individual sides: [S1]
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```css
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p.one {
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border-style: solid;
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border-width: 5px 20px; /* 5px top and bottom, 20px on the sides */
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}
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p.two {
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border-style: solid;
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border-width: 20px 5px; /* 20px top and bottom, 5px on the sides */
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}
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p.three {
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border-style: solid;
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border-width: 25px 10px 4px 35px; /* 25px top, 10px right, 4px bottom and 35px left */
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}
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```
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## 🛠️ 적용 사례 (Applied in summary)
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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.
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## 💻 코드 패턴 (Code patterns)
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Single width for all sides (language: CSS):
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```css
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p.one {
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border-style: solid;
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border-width: 5px;
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}
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```
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Per-side widths, four values (top, right, bottom, left):
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```css
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p.three {
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border-style: solid;
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border-width: 25px 10px 4px 35px; /* 25px top, 10px right, 4px bottom and 35px left */
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}
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```
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source.
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.90
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[CSS Tutorial]]
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- **관련 개념:** [[CSS Border Style]], [[CSS Border Color]], [[CSS Border Sides]], [[CSS Border Shorthand]]
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- **참조 맥락:** Used together with `border-style` whenever a border's thickness needs to be controlled.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Border Width — https://www.w3schools.com/css/css_border_width.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Border Width" page (Astra wiki-curation, P-Reinforce v3.1 format).
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