docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합
이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영. - Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들 (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거. - Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/ Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/ Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이 존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존). - Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/ JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동. - 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리. - Topic_Programming 최종 문서 수: 2784 → 3985.
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Antigravity Agent
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id: css-clear-and-clearfix
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title: "CSS Clear and Clearfix"
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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: ["clear", "clearfix", "clearfix hack", "CSS clear", "clear both", "float clearing"]
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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", "clear", "layout"]
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raw_sources: ["https://www.w3schools.com/css/css_float_clear.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Clear and Clearfix]]
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## 🎯 한 줄 통찰 (One-line insight)
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The `clear` property stops elements from wrapping around floated content, and the clearfix hack (an `::after` pseudo-element with `clear: both`) forces a container to expand to include its floated children. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **clear purpose** — the `clear` property specifies behavior for elements adjacent to floated content; it prevents elements from wrapping around or beside the floated content. [S1]
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- **none (default)** — allows floating on either side. [S1]
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- **left** — pushes the element below left-side floats. [S1]
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- **right** — pushes the element below right-side floats. [S1]
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- **both** — pushes the element below floats on both sides. [S1]
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- **inherit** — inherits the parent's clear value. [S1]
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- **clearfix problem** — when floated elements exceed their container's height, they overflow the container. [S1]
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- **clearfix solution** — use the `::after` pseudo-element to contain floats properly. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Drop below a float** — set `clear` (e.g. `clear: left`) on the next element to push it below the float instead of beside it. [S1]
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- **Clearfix hack** — add an `::after` pseudo-element with empty content, `clear: both`, and `display: table` to make a parent contain its floated children. [S1]
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## 📖 세부 내용 (Details)
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**The clear property** [S1]
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The `clear` property specifies behavior for elements adjacent to floated content. It prevents elements from wrapping around or beside the floated content.
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**Clear property values** [S1]
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| Value | Behavior |
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|-------|----------|
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| none | Allows floating on either side (default) |
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| left | Pushes element below left-side floats |
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| right | Pushes element below right-side floats |
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| both | Pushes element below floats on both sides |
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| inherit | Inherits parent's clear value |
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**Clear example** [S1]
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```css
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div1 {
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float: left;
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}
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div2 {
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clear: left;
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}
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```
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**The clearfix hack** [S1]
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When floated elements exceed container height, they overflow. The clearfix solution uses the `::after` pseudo-element to contain floats properly.
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```css
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.clearfix::after {
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content: "";
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clear: both;
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display: table;
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}
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```
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**How it works** [S1]
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- `.clearfix::after` targets the pseudo-element generated after the element's content.
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- `content: ""` renders the pseudo-element despite having no visible content.
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- `clear: both` pushes following content below floated elements and expands the parent container.
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- `display: table` establishes a new block formatting context for containing floats.
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The page notes: "This clears both left and right floats, effectively pushing any following content below the floated elements, and forces the parent container to expand to include them." [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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The page's applied examples are a `clear: left` element dropped below a left-floated sibling, and a `.clearfix` container that uses `::after { content: ""; clear: both; display: table; }` to expand around its floated children. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Push an element below a left float (language: CSS):
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```css
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div1 {
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float: left;
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}
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div2 {
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clear: left;
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}
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```
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Clearfix hack to contain floats (language: CSS):
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```css
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.clearfix::after {
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content: "";
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clear: both;
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display: table;
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}
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```
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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- **none** — default; element may sit beside floats. [S1]
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- **left / right** — drop the element below floats on that one side. [S1]
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- **both** — drop below floats on either side; used inside the clearfix hack. [S1]
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- **inherit** — take the parent's clear value. [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 Overflow]], [[CSS Position Fixed and Absolute]]
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- **참조 맥락:** Referenced whenever floated elements must be cleared or a container must expand to contain its floats.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Clear and Clearfix — https://www.w3schools.com/css/css_float_clear.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Clear and Clearfix" page (Astra wiki-curation, P-Reinforce v3.1 format).
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