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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 Content Pseudo-elements

🎯 한 줄 통찰 (One-line insight)

Content pseudo-elements insert or style generated parts of an element — ::before/::after add content, while ::marker, ::selection, and ::backdrop style list markers, selected text, and dialog backdrops. [S1]

🧠 핵심 개념 (Core concepts)

::before — inserts some content before the content of a specified element, via the content property. [S1]
::after — inserts some content after the content of a specified element, via the content property. [S1]
::marker — styles the list item markers. [S1]
::selection — styles the part of a text that is selected by a user. [S1]
::backdrop — styles the viewbox behind a dialog box or popover element. [S1]

🧩 추출된 패턴 (Extracted patterns)

Generated content — ::before/::after paired with the content property inject images or text that are not in the HTML. [S1]
Marker styling — ::marker recolors and resizes list bullets/numbers without changing list structure. [S1]
User-state styling — ::selection reacts to the user's text selection. [S1]

📖 세부 내용 (Details)

The ::before pseudo-element [S1] The ::before pseudo-element is used to insert some content before the content of a specified element. Here it inserts an image before each <h3>:

h3::before {
  content: url(smiley.gif);
}

The ::after pseudo-element [S1] The ::after pseudo-element is used to insert some content after the content of a specified element:

h3::after {
  content: url(smiley.gif);
}

The ::marker pseudo-element [S1] The ::marker pseudo-element is used to style the list item markers:

::marker {
  color: red;
  font-size: 23px;
}

The ::selection pseudo-element [S1] The ::selection pseudo-element is used to style the part of a text that is selected by a user:

::selection {
  color: red;
  background: yellow;
}

The ::backdrop pseudo-element [S1] The ::backdrop pseudo-element is used to style the viewbox behind a dialog box or popover element:

dialog::backdrop {
  background-color: lightgreen;
}

🛠️ 적용 사례 (Applied in summary)

The page's applied examples are the smiley image inserted before/after <h3>, recolored/enlarged list markers, red-on-yellow text selection, and a light-green dialog backdrop. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Insert content before an element (language: CSS):

h3::before {
  content: url(smiley.gif);
}

Style user-selected text (language: CSS):

::selection {
  color: red;
  background: yellow;
}

⚖️ 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 Pseudo-elements, CSS Text Pseudo-elements, CSS Lists
참조 맥락: Referenced when inserting generated content or styling markers, selections, and dialog backdrops.

📚 출처 (Sources)

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

📝 변경 이력 (Change history)

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

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