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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 Effects

🎯 한 줄 통찰 (One-line insight)

The text-shadow property adds shadow to text using horizontal and vertical offsets (with optional blur and color), and multiple comma-separated shadows can be layered to build glow, neon, and text-outline effects. [S1]

🧠 핵심 개념 (Core concepts)

text-shadow adds shadow to text — the property applies a shadow to the text it styles. [S1]
Minimum form = two offsets — in its simplest use you specify only the horizontal and vertical shadow offsets. [S1]
Optional blur and color — you can add a blur radius and a color to the shadow. [S1]
Multiple shadows — you can layer more than one shadow by separating them with commas, enabling glow and outline effects. [S1]
Related to box-shadow — the page links onward to box-shadow, which applies shadow to elements (boxes) rather than text. [S1]

🧩 추출된 패턴 (Extracted patterns)

Offset-only pattern — text-shadow: <h-offset> <v-offset>;. [S1]
Offset + color pattern — append a color: text-shadow: 2px 2px red;. [S1]
Offset + blur + color pattern — text-shadow: 2px 2px 5px red;. [S1]
Neon glow pattern — zero offsets with blur: text-shadow: 0 0 3px #ff0000;, stackable for multi-color glow. [S1]
Text-border pattern — four shadows offset in each direction to outline the text. [S1]

📖 세부 내용 (Details)

Basic text-shadow (horizontal and vertical offset) [S1] The simplest use specifies the horizontal shadow (2px) and the vertical shadow (2px):

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

Add a color to the shadow [S1]

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

Add a blur effect to the shadow [S1]

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

White text with a black shadow [S1]

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

Red neon glow effect [S1]

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

Red and blue neon glow effect (multiple shadows) [S1] To add more than one shadow to the text, add a comma-separated list of shadows:

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

Border around text using four shadows [S1]

h1 {
  color: coral;
  text-shadow: -1px 0 black, 0 1px black, 1px 0 black, 0 -1px black;
}

Note [S1] The page introduces box-shadow as a related property covered on the next page (Box Shadow), which adds shadow to elements rather than text.

🛠️ 적용 사례 (Applied in summary)

The page's own demonstrations (h1 elements showing offset-only, colored, blurred, white-on-black, neon glow, and text-border shadows) serve as the applied examples. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Simple text shadow (language: CSS):

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

Neon glow (stacked shadows):

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

Text outline via four shadows:

h1 {
  color: coral;
  text-shadow: -1px 0 black, 0 1px black, 1px 0 black, 0 -1px black;
}

⚖️ 비교 및 선택 기준 (Comparison & decision criteria)

text-shadow vs box-shadow — text-shadow shadows the glyphs of text; box-shadow (the next page) shadows the element box. Choose by what you want shadowed. [S1]
Single vs multiple shadows — one shadow gives a simple drop effect; comma-separated multiple shadows enable neon glow and full text outlines. [S1]

⚖️ 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: 0.90
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: CSS Tutorial
관련 개념: CSS Box Shadow, CSS Text Effects, CSS Linear Gradients
참조 맥락: Referenced when adding depth, glow, or outline to text headings and labels.

📚 출처 (Sources)

[S1] W3Schools — CSS Text Shadow Effects — https://www.w3schools.com/css/css3_shadows.asp

📝 변경 이력 (Change history)

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

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