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-navigation-bar
+title: "CSS Navigation Bar"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["navbar", "navigation bar", "nav menu", "list of links", "site navigation"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["css", "web", "frontend", "w3schools", "navbar", "navigation"]
+raw_sources: ["https://www.w3schools.com/css/css_navbar.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CSS Navigation Bar]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+A navigation bar is fundamentally a list of links built from `<ul>`/`<li>` elements, then stripped of its default bullets, margins, and padding so CSS can style it into a navbar. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **What it is** — a navigation bar is an important web-design component that helps users navigate between sections of a website. [S1]
+- **Built from lists** — navbars are typically built with HTML list elements (`<ul>` and `<li>`) and then styled with CSS. [S1]
+- **Placement** — navigation bars are typically located at the top or side of a webpage. [S1]
+- **Navbar = list of links** — since a navbar is basically a list of links, `<ul>` and `<li>` are a natural fit. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Reset the list** — `list-style-type: none; margin: 0; padding: 0;` removes bullets and default browser spacing, giving a clean base for styling. [S1]
+- **Shared base** — the same HTML+CSS base is reused for both vertical and horizontal navbars. [S1]
+
+## 📖 세부 내용 (Details)
+**Introduction** [S1]
+A navigation bar is an important component of web design. Navigation bars help users navigate between different sections of a website. They are typically built with HTML list elements (`<ul>` and `<li>`), then styled with CSS. Navigation bars are typically located at the top or side of a webpage.
+
+**Navigation Bar = List of Links** [S1]
+A navigation bar is basically a list of links, so using the HTML `<ul>` and `<li>` elements makes perfect sense:
+```html
+<ul>
+  <li><a href="default.asp">Home</a></li>
+  <li><a href="news.asp">News</a></li>
+  <li><a href="contact.asp">Contact</a></li>
+  <li><a href="about.asp">About</a></li>
+</ul>
+```
+
+Then strip the list of its default styling:
+```css
+ul {
+  list-style-type: none;
+  margin: 0;
+  padding: 0;
+}
+```
+
+**Example explained** [S1]
+- `list-style-type: none;` — Removes the bullet points from the list
+- `margin: 0;` — Resets default browser margins
+- `padding: 0;` — Resets default browser paddings
+
+**Note** [S1]
+The HTML and CSS code in the example above is the base code used for both vertical and horizontal navigation bars, which are covered in the next chapters.
+
+## 🛠️ 적용 사례 (Applied in summary)
+The page's applied example is the four-link `<ul>` (Home / News / Contact / About) reset with `list-style-type: none; margin: 0; padding: 0;` — the shared base for the vertical and horizontal navbar pages. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Link list (language: HTML):
+```html
+<ul>
+  <li><a href="default.asp">Home</a></li>
+  <li><a href="news.asp">News</a></li>
+  <li><a href="contact.asp">Contact</a></li>
+  <li><a href="about.asp">About</a></li>
+</ul>
+```
+List reset (language: CSS):
+```css
+ul {
+  list-style-type: none;
+  margin: 0;
+  padding: 0;
+}
+```
+
+## ⚖️ 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:** 0.88
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[CSS Tutorial]]
+- **관련 개념:** [[CSS Vertical Navbar]], [[CSS Horizontal Navbar]], [[CSS Lists]], [[CSS Links]]
+- **참조 맥락:** The base chapter referenced before building any vertical or horizontal navigation bar.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — CSS Navigation Bar — https://www.w3schools.com/css/css_navbar.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Navigation Bar" page (Astra wiki-curation, P-Reinforce v3.1 format).