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koriweb 9609c04755 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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title

CSS Pseudo-elements

🎯 한 줄 통찰 (One-line insight)

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]

🧠 핵심 개념 (Core concepts)

Definition — A CSS pseudo-element is a keyword that can be added to a selector, to style a specific part of an element. [S1]
Double-colon syntax — pseudo-elements are written with :: after the selector. [S1]
Two families — text pseudo-elements (::first-line, ::first-letter) and content pseudo-elements (::before, ::after, ::marker, ::selection, ::backdrop). [S1]

🧩 추출된 패턴 (Extracted patterns)

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]
Syntax pattern — selector::pseudo-element-name { CSS properties }. [S1]

📖 세부 내용 (Details)

Definition [S1] 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:

Styling the first letter or first line of an element
Inserting content before or after an element
Styling list item markers
Styling user-selected portions of an element
Styling the viewbox behind a dialog box

Syntax [S1]

selector::pseudo-element-name {
  CSS properties
}

Text pseudo-elements [S1]

Pseudo-element	Description
`::first-line`	Style the first line of text
`::first-letter`	Style the first letter of text

Content pseudo-elements [S1]

Pseudo-element	Description
`::before`	Insert content before an element
`::after`	Insert content after an element
`::marker`	Style list item markers
`::selection`	Style user-selected text
`::backdrop`	Style dialog backdrop

The source references a complete CSS Pseudo-elements Reference for the full list. [S1]

🛠️ 적용 사례 (Applied in summary)

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.

💻 코드 패턴 (Code patterns)

Pseudo-element syntax (language: CSS):

selector::pseudo-element-name {
  CSS properties
}

⚖️ 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 Text Pseudo-elements, CSS Content Pseudo-elements, CSS Structural Pseudo-classes
참조 맥락: The entry point whenever styling a specific part of an element rather than the whole.

📚 출처 (Sources)

[S1] W3Schools — CSS Pseudo-elements — https://www.w3schools.com/css/css_pseudo_elements.asp

📝 변경 이력 (Change history)

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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