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>

10_Wiki/Topic_CSS/CSS_Rounded_Borders.md

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+---
+id: css-rounded-borders
+title: "CSS Rounded Borders"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["border-radius", "CSS rounded borders", "rounded corners", "round border", "corner radius"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.86
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["css", "web", "frontend", "w3schools", "border", "border-radius"]
+raw_sources: ["https://www.w3schools.com/css/css_border_rounded.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CSS Rounded Borders]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The `border-radius` property is used to add rounded corners to an element, with larger radius values producing rounder corners. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`border-radius`** is used to add rounded borders to an element. [S1]
+- **Visual progression** — the page demonstrates corners ranging from a normal (square) border through increasingly rounded variants ("Normal border", "Round border", "Rounder border", "Roundest border"). [S1]
+- **Combined with a border** — rounded corners are shown applied on top of a defined border (e.g. `2px solid red`). [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Border-plus-radius** — pair a `border` declaration with a `border-radius` value to round the corners of a bordered element. [S1]
+- **Radius magnitude controls roundness** — increasing the radius value increases the visible corner curvature. [S1]
+
+## 📖 세부 내용 (Details)
+**CSS Rounded Borders** [S1]
+The `border-radius` property is used to add rounded borders to an element.
+
+**Example** — a paragraph with a solid red border and rounded corners: [S1]
+```css
+p {
+  border: 2px solid red;
+  border-radius: 5px;
+}
+```
+
+The page visually shows several levels of rounding labelled "Normal border", "Round border", "Rounder border", and "Roundest border". The exact CSS source for each individual labelled variation (beyond the `5px` example above) was rendered as images in the page and is **Not found in source**. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+The page's own applied example is the single paragraph rule above, combining a `2px solid red` border with a `5px` `border-radius`. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Rounded border on a bordered element (language: CSS):
+```css
+p {
+  border: 2px solid red;
+  border-radius: 5px;
+}
+```
+
+## ⚖️ 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:** 0.86
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[CSS Tutorial]]
+- **관련 개념:** [[CSS Border Shorthand]], [[CSS Border Style]], [[CSS Border Width]], [[CSS Border Color]]
+- **참조 맥락:** Applied on top of a defined border to soften an element's corners.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — CSS Rounded Borders — https://www.w3schools.com/css/css_border_rounded.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Rounded Borders" page (Astra wiki-curation, P-Reinforce v3.1 format).