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-pseudo-elements
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title: "CSS Pseudo-elements"
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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: ["pseudo-elements", "::before", "::after", "::first-line", "::marker", "double-colon selectors"]
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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", "pseudo-elements", "selectors"]
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raw_sources: ["https://www.w3schools.com/css/css_pseudo_elements.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Pseudo-elements]]
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## 🎯 한 줄 통찰 (One-line insight)
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A CSS pseudo-element is a keyword added to a selector that lets you style a specific part of an element — the first line, the first letter, inserted content, list markers, selected text, or a dialog backdrop. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Definition** — A CSS pseudo-element is a keyword that can be added to a selector, to style a specific part of an element. [S1]
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- **Double-colon syntax** — pseudo-elements are written with `::` after the selector. [S1]
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- **Two families** — text pseudo-elements (`::first-line`, `::first-letter`) and content pseudo-elements (`::before`, `::after`, `::marker`, `::selection`, `::backdrop`). [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Style a part, not the whole** — pseudo-elements address sub-parts of an element (a line, a letter, generated content) rather than the element as a whole. [S1]
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- **Syntax pattern** — `selector::pseudo-element-name { CSS properties }`. [S1]
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## 📖 세부 내용 (Details)
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**Definition** [S1]
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A CSS pseudo-element is a keyword that can be added to a selector, to style a specific part of an element. Common uses include:
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- Styling the first letter or first line of an element
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- Inserting content before or after an element
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- Styling list item markers
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- Styling user-selected portions of an element
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- Styling the viewbox behind a dialog box
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**Syntax** [S1]
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```css
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selector::pseudo-element-name {
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CSS properties
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}
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```
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**Text pseudo-elements** [S1]
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| Pseudo-element | Description |
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| --- | --- |
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| `::first-line` | Style the first line of text |
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| `::first-letter` | Style the first letter of text |
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**Content pseudo-elements** [S1]
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| Pseudo-element | Description |
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| --- | --- |
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| `::before` | Insert content before an element |
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| `::after` | Insert content after an element |
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| `::marker` | Style list item markers |
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| `::selection` | Style user-selected text |
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| `::backdrop` | Style dialog backdrop |
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The source references a complete CSS Pseudo-elements Reference for the full list. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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This page is an overview/index; the detailed applied examples live on the dedicated text and content pseudo-element pages. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Pseudo-element syntax (language: CSS):
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```css
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selector::pseudo-element-name {
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CSS properties
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}
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```
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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 Text Pseudo-elements]], [[CSS Content Pseudo-elements]], [[CSS Structural Pseudo-classes]]
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- **참조 맥락:** The entry point whenever styling a specific part of an element rather than the whole.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Pseudo-elements — https://www.w3schools.com/css/css_pseudo_elements.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Pseudo-elements" page (Astra wiki-curation, P-Reinforce v3.1 format).
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