2nd/10_Wiki/Topic_CSS/CSS_Horizontal_Navbar.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-horizontal-navbar	CSS Horizontal Navbar	Frontend	draft	conceptual		horizontal navbar top navigation horizontal navigation bar flex navbar float navbar sticky navbar		B	0.87	2026-06-23	2026-06-23			css web frontend w3schools navbar navigation	https://www.w3schools.com/css/css_navbar_horizontal.asp

CSS Horizontal Navbar

🎯 한 줄 통찰 (One-line insight)

A horizontal navbar lays its list items side by side using either floating list items or a flexbox <ul>, then adds hover/active states, dividers, and fixed or sticky positioning. [S1]

🧠 핵심 개념 (Core concepts)

• Float method — ul li { float: left; } with overflow: hidden on the <ul> lays links horizontally. [S1]
• Flex method — display: flex on the <ul> arranges links in a row. [S1]
• Block links — display: block on a makes the full link area clickable. [S1]
• Active class — a.active marks the current link with a highlight color. [S1]
• Fixed/sticky positioning — position: fixed (top/bottom) or position: sticky (with top) keeps the navbar in view while scrolling. [S1]

🧩 추출된 패턴 (Extracted patterns)

• Two layout methods — floating list items (float: left) or a flex container (display: flex) both yield a horizontal row. [S1]
• Dividers — border-right on each li with li:last-child { border-right: none; } removes the trailing divider. [S1]
• Right-aligned item — style="float:right" on a single <li> pushes one link to the right. [S1]
• Sticky requires an offset — at least one of top/right/bottom/left must be set for sticky to work. [S1]

📖 세부 내용 (Details)

Horizontal navbar with float [S1]

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333333;
}

ul li {
  float: left;
}

ul li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

ul li a:hover {
  background-color: #111111;
}

Horizontal navbar with flex [S1]

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  background-color: #333333;
  display: flex;
}

ul li a {
  display: block;
  color: white;
  padding: 14px 16px;
  text-decoration: none;
}

ul li a:hover {
  background-color: #111111;
}

Horizontal centered navbar with flex [S1]

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  background-color: #333333;
  display: flex;
  justify-content: center;
}

Active state [S1]

ul li a.active {
  background-color: #04AA6D;
}

Gray horizontal navbar [S1]

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  display: flex;
  border: 1px solid #e7e7e7;
  background-color: #f3f3f3;
}

Right-align the last link [S1]

<ul>
  <li><a href="#home" class="active">Home</a></li>
  <li><a href="#news">News</a></li>
  <li><a href="#contact">Contact</a></li>
  <li style="float:right"><a href="#about">About</a></li>
</ul>

Border dividers [S1]

/* Add a lightgray right border to all list items, except the last */
ul li {
  float: left;
  border-right: 1px solid #bbbbbb;
}

ul li:last-child {
  border-right: none;
}

Fixed top navbar [S1]

ul {
  position: fixed;
  top: 0;
  width: 100%;
}

Fixed bottom navbar [S1]

ul {
  position: fixed;
  bottom: 0;
  width: 100%;
}

Note [S1] Fixed position might not work properly on mobile devices.

Sticky navbar [S1]

ul {
  position: sticky;
  top: 0;
}

Note [S1] You must specify at least one of the top, right, bottom or left properties, for sticky positioning to work.

🛠️ 적용 사례 (Applied in summary)

The page's applied examples are the dark float navbar, the flex navbar, the centered flex navbar, the green .active link, the gray flex navbar, the right-aligned About link, border dividers, fixed top/bottom navbars, and the sticky navbar. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Float-based horizontal navbar (language: CSS):

ul li {
  float: left;
}

ul li a {
  display: block;
  padding: 14px 16px;
  text-decoration: none;
}

Sticky navbar (language: CSS):

ul {
  position: sticky;
  top: 0;
}

⚖️ 비교 및 선택 기준 (Comparison & decision criteria)

• Float vs Flex layout — The source presents two methods for laying out a horizontal navbar: floating the list items (ul li { float: left; }, with overflow: hidden on the <ul>) or using a flex container (display: flex on the <ul>). Both produce a horizontal row of links; the flex method additionally enables justify-content: center for easy centering. [S1]
• Fixed vs Sticky positioning — position: fixed pins the navbar to the top or bottom of the viewport (but may not work properly on mobile), while position: sticky keeps it in flow until scrolled and requires at least one offset (top/right/bottom/left) to work. [S1]

⚖️ 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: 0.87
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: CSS Tutorial
• 관련 개념: CSS Navigation Bar, CSS Vertical Navbar, CSS Position, CSS Flexbox
• 참조 맥락: Referenced when building a top or bottom navigation bar with float or flex layout.

📚 출처 (Sources)

• [S1] W3Schools — CSS Horizontal Navbar — https://www.w3schools.com/css/css_navbar_horizontal.asp

📝 변경 이력 (Change history)

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