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>
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id: html-charsets
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title: "HTML Charsets"
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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: ["HTML character sets", "HTML encoding", "character encoding", "UTF-8", "ASCII", "ANSI", "ISO-8859-1", "charset meta"]
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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: ["html", "web", "frontend", "charset", "encoding", "utf-8", "w3schools"]
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raw_sources: ["https://www.w3schools.com/html/html_charset.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[HTML Charsets]]
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## 🎯 한 줄 통찰 (One-line insight)
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To display an HTML page correctly a browser must know which **character set (encoding)** the page uses; modern HTML declares it with `<meta charset="UTF-8">`, and UTF-8 — covering nearly all the world's characters — is the recommended and default choice. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **The charset attribute** — proper display requires the browser to know the page's character encoding, declared via `<meta charset="...">`. [S1]
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- **UTF-8 is recommended** — it covers almost all of the characters and symbols in the world, and is the default character set in HTML5. [S1]
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- **Historical progression of encodings** — ASCII → ANSI (Windows-1252) → ISO-8859-1 (HTML 4 default) → UTF-8 (modern default). Each newer set is largely backward-compatible with ASCII at code points 0–127. [S1]
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- **Shared low range** — across ASCII, ANSI, ISO-8859-1, and UTF-8, code points 0–127 are identical. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **HTML5 charset declaration** — `<meta charset="UTF-8">`. [S1]
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- **HTML4 charset declaration** — `<meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1">`. [S1]
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- **Backward-compatibility pattern** — newer encodings keep ASCII (0–127) intact and extend the upper range. [S1]
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## 📖 세부 내용 (Details)
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**The HTML charset Attribute**
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To display an HTML page correctly, a web browser must know the character set used in the page. Developers are encouraged to use UTF-8, which covers almost all of the characters and symbols in the world. The standard declaration is: [S1]
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```html
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<meta charset="UTF-8">
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```
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**The ASCII Character Set**
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ASCII was the first character encoding standard for the web. It defined 128 different Latin characters, including English letters (a–z, A–Z), numbers (0–9), and special characters such as `! $ + - ( ) @ < > . # ?`. [S1]
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**The ANSI Character Set (Windows-1252)**
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ANSI (Windows-1252) was the first Windows character set. Its layout: [S1]
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- Characters 0–127 match ASCII.
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- Characters 128–159 contain special characters.
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- Characters 160–255 align with UTF-8.
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HTML5 declaration: [S1]
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```html
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<meta charset="Windows-1252">
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```
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**The ISO-8859-1 Character Set**
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ISO-8859-1 was the default character set for HTML 4, supporting 256 characters: [S1]
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- Characters 0–127 are identical to ASCII.
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- Characters 128–159 are unused.
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- Characters 160–255 match ANSI and UTF-8.
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HTML 4 syntax: [S1]
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```html
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<meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1">
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```
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HTML 5 syntax: [S1]
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```html
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<meta charset="ISO-8859-1">
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```
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**The UTF-8 Character Set**
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UTF-8 character coverage: [S1]
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- Values 0–127 match ASCII.
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- Characters 128–159 are unused.
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- Characters 160–255 align with ANSI / ISO-8859-1.
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- From value 256 onward, UTF-8 extends to over 10,000 additional characters.
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**Encoding comparison summary** [S1]
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| Character set | Range 0–127 | Range 128–159 | Range 160–255 | Beyond 255 |
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|---|---|---|---|---|
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| ASCII | Latin characters (128 total) | — | — | — |
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| ANSI (Windows-1252) | Same as ASCII | Special characters | Same as UTF-8 | — |
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| ISO-8859-1 | Same as ASCII | Unused | Same as ANSI/UTF-8 | — |
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| UTF-8 | Same as ASCII | Unused | Same as ANSI/8859-1 | 10,000+ characters from 256 onward |
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The page also references many UTF-8 character-set categories, including Basic Latin, Latin Extended A–E, IPA Extensions, Spacing Modifiers, Diacritical Marks, General Punctuation, Super/Subscript, and Braille. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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The canonical applied case is the single `<meta charset="UTF-8">` declaration that should appear in the head of essentially every modern HTML page. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Declare UTF-8 in HTML5 (recommended):
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```html
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<meta charset="UTF-8">
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```
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Legacy HTML4 ISO-8859-1 declaration:
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```html
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<meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1">
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```
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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- **ASCII** — only 128 Latin characters; the original web encoding, insufficient for international text. [S1]
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- **ANSI (Windows-1252)** — the first Windows set; adds special characters in 128–159, but Windows-specific. [S1]
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- **ISO-8859-1** — the HTML 4 default; 256 characters, still limited for global content. [S1]
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- **UTF-8** — recommended choice and the HTML5 default; covers almost all of the world's characters and is backward-compatible with ASCII at 0–127. Use UTF-8 unless a legacy constraint forces otherwise. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source. The historical default shifted from ISO-8859-1 (HTML 4) to UTF-8 (HTML5), reflecting the move toward universal Unicode support. [S1]
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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:** [[HTML Tutorial]]
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- **관련 개념:** [[HTML Emojis]], [[HTML Symbols]], [[HTML URL Encode]], [[HTML Head]]
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- **참조 맥락:** Referenced whenever defining how a page's text is encoded, especially for international characters and emojis.
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## 📚 출처 (Sources)
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- [S1] W3Schools — HTML Charsets — https://www.w3schools.com/html/html_charset.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "HTML Charsets" page (Astra wiki-curation, P-Reinforce v3.1 format).
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