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-float-examples
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title: "CSS Float Examples"
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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: ["float layout", "float columns", "equal width boxes", "images side by side", "CSS float menu"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.88
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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", "float", "layout"]
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raw_sources: ["https://www.w3schools.com/css/css_float_examples.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Float Examples]]
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## 🎯 한 줄 통찰 (One-line insight)
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With the `float` property it is easy to float boxes of content side by side — combined with `box-sizing: border-box` to keep padding inside the box, `float` builds equal-width columns, image grids, and horizontal menus. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Floating boxes side by side** — `float: left` lets you position boxes of content next to each other. [S1]
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- **`box-sizing: border-box` is essential** — it makes the padding stay inside the box so the box does not break when padding is added. [S1]
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- **Width determines column count** — `33.33%` makes three boxes; use `25%` for four, `50%` for two, etc. [S1]
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- **Equal heights are a known limitation of float** — a fixed `height` is one workaround, but Flexbox can automatically stretch boxes to be as long as the longest box. [S1]
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- **Float also drives horizontal menus** — `float` can be used with a list of hyperlinks to create a horizontal menu. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Equal-width column pattern** — set `box-sizing: border-box` globally, then float each box left with a percentage width and padding. [S1]
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- **Image grid pattern** — the same float + percentage-width + padding recipe applied to image containers. [S1]
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- **Fallback for equal heights** — fix `height` when floats produce uneven box heights; prefer Flexbox for automatic equalization. [S1]
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## 📖 세부 내용 (Details)
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**Create Equal Width Boxes**
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With the `float` property it is easy to float boxes of content side by side. The `box-sizing` property ensures the padding stays inside the box and that it does not break. [S1]
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```css
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* {
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box-sizing: border-box;
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}
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.box {
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float: left;
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width: 33.33%; /* three boxes (use 25% for four, and 50% for two, etc) */
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padding: 50px; /* if you want space between the images */
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}
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```
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**Images Side By Side**
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The same floating technique displays images in a grid layout. [S1]
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```css
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.img-container {
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float: left;
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width: 33.33%; /* three containers (use 25% for four, and 50% for two, etc) */
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padding: 5px; /* if you want space between the images */
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}
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```
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**Create Boxes With Equal Heights**
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Floated boxes do not automatically share a height. One workaround is to set a fixed height. [S1]
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```css
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.box {
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height: 500px;
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}
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```
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A better alternative is Flexbox, which can automatically stretch boxes to be as long as the longest box. The page references trying a Flexbox version of the layout. [S1]
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**Navigation Menu**
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You can also use `float` with a list of hyperlinks to create a horizontal menu. The page does not provide a distinct code block for this example in the fetched source. [S1] — Not found in source (exact menu CSS).
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**All CSS Float Properties (reference table)** [S1]
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| Property | Description |
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|----------|-------------|
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| `box-sizing` | Defines how the width and height of an element are calculated: should they include padding and borders, or not |
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| `clear` | Specifies what should happen with the element that is next to a floating element |
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| `float` | Specifies whether an element should float to the left, right, or not at all |
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## 🛠️ 적용 사례 (Applied in summary)
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The page's own applied examples are the equal-width box layout, the side-by-side image grid, the equal-height workaround, and a float-based horizontal menu. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Equal-width float columns (language: CSS):
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```css
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* {
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box-sizing: border-box;
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}
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.box {
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float: left;
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width: 33.33%;
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padding: 50px;
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}
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```
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Image grid:
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```css
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.img-container {
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float: left;
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width: 33.33%;
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padding: 5px;
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}
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```
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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- **Float vs Flexbox for equal heights** — float boxes do not equalize height on their own (requires a fixed `height`), whereas Flexbox can automatically stretch boxes to match the longest box. The page recommends Flexbox as the better alternative. [S1]
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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:** 0.88
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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 Float]], [[CSS Inline Block]], [[CSS Horizontal Align]], [[CSS Flexbox]]
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- **참조 맥락:** Referenced when building multi-column layouts, image grids, or horizontal menus with the legacy float technique.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Float Examples — https://www.w3schools.com/css/css_float_examples.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Float Examples" page (Astra wiki-curation, P-Reinforce v3.1 format).
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