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>
2026-06-23 19:21:18 +09:00
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+---
+id: css-border-sides
+title: "CSS Border Sides"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["border sides", "CSS individual borders", "border-top-style", "border per side", "border value count"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.89
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["css", "web", "frontend", "w3schools", "border", "border-sides"]
+raw_sources: ["https://www.w3schools.com/css/css_border_sides.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[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]
+```css
+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]
+```css
+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]
+```css
+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]
+```css
+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]
+```css
+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):
+```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):
+```css
+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).