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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 Text Shadow

🎯 한 줄 통찰 (One-line insight)

The text-shadow property adds shadow effects to text, taking horizontal and vertical offsets with optional blur radius and color, and supports comma-separated multiple shadows for neon-style glows. [S1]

🧠 핵심 개념 (Core concepts)

text-shadow property — adds shadow effects to text. [S1]
Basic syntax — requires a horizontal offset and a vertical offset value. [S1]
Optional parameters — a color and a blur radius can be added to the shadow. [S1]
Multiple shadows — several shadows can be applied to the same text by separating them with commas. [S1]

🧩 추출된 패턴 (Extracted patterns)

Offset-only shadow — text-shadow: 2px 2px; sets only the horizontal and vertical offset. [S1]
Colored shadow — append a color: text-shadow: 2px 2px red;. [S1]
Blurred shadow — add a blur value before the color: text-shadow: 2px 2px 5px red;. [S1]
Neon glow — zero offset with blur produces a glow: text-shadow: 0 0 3px #ff0000;. [S1]
Layered glow — comma-chain several shadows to build multi-color neon effects. [S1]

📖 세부 내용 (Details)

The text-shadow property specifies the shadow effect added to text. The basic syntax requires horizontal and vertical offset values, with optional color and blur parameters. [S1]

Basic shadow — horizontal and vertical offset only: [S1]

h1 {
  text-shadow: 2px 2px;
}

With color — adding a color to the shadow: [S1]

h1 {
  text-shadow: 2px 2px red;
}

With blur effect — adding a blur radius before the color: [S1]

h1 {
  text-shadow: 2px 2px 5px red;
}

White text with a dark shadow: [S1]

h1 {
  color: white;
  text-shadow: 2px 2px 4px #000000;
}

Red neon glow — zero offset with a small blur: [S1]

h1 {
  text-shadow: 0 0 3px #ff0000;
}

Multiple shadows (red and blue neon) — comma-separated shadow list: [S1]

h1 {
  text-shadow: 0 0 3px #ff0000, 0 0 5px #0000ff;
}

Multiple color neon glow: [S1]

h1 {
  color: white;
  text-shadow: 1px 1px 2px black, 0 0 25px blue, 0 0 5px red;
}

Property reference [S1]

Property	Description
`text-shadow`	Specifies the shadow effect added to text

🛠️ 적용 사례 (Applied in summary)

The page's own examples demonstrate the property applied to h1 elements — from a plain offset shadow to layered neon glows combining multiple comma-separated shadows. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

General text-shadow form (language: CSS):

selector {
  text-shadow: h-offset v-offset blur color;
}

Concrete neon example:

h1 {
  color: white;
  text-shadow: 1px 1px 2px black, 0 0 25px blue, 0 0 5px red;
}

⚖️ 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: 0.89
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: CSS Tutorial
관련 개념: CSS Text, CSS Fonts, CSS Color
참조 맥락: Referenced when adding depth, emphasis, or neon/glow effects to headings and display text.

📚 출처 (Sources)

[S1] W3Schools — CSS Text Shadow — https://www.w3schools.com/css/css_text_shadow.asp

📝 변경 이력 (Change history)

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

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