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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 Add External

🎯 한 줄 통찰 (One-line insight)

There are three ways to insert CSS — external, internal, and inline; an external style sheet lets you change the look of an entire website by editing just one .css file, referenced from each page via a <link> element in the head. [S1]

🧠 핵심 개념 (Core concepts)

Three ways to insert CSS — External CSS (link to an external .css file), Internal CSS (use the <style> element in the head section), and Inline CSS (use the style attribute on HTML elements). [S1]
External CSS power — with an external style sheet, you can change the look of an entire website by changing just one file. [S1]
Reference mechanism — each HTML page must include a reference to the external style sheet file inside the <link> element, inside the head section. [S1]
No space before units — do not add a space between the property value and the unit (e.g. 20px, not 20 px). [S1]

🧩 추출된 패턴 (Extracted patterns)

Single source of truth — one external .css file linked from many pages centralizes site-wide styling. [S1]
Head linkage — <link rel="stylesheet" href="…css"> inside <head> connects a page to its stylesheet. [S1]

📖 세부 내용 (Details)

CSS can be added to HTML documents in 3 ways: [S1]

External CSS — link to an external .css file.
Internal CSS — use the <style> element in the head section.
Inline CSS — use the style attribute on HTML elements.

External CSS — with an external style sheet, you can change the look of an entire website by changing just one file! Each HTML page must include a reference to the external style sheet file inside the <link> element, inside the head section. [S1]

<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="mystyle.css">
</head>
<body>
<h1>This is a heading</h1>
<p>This is a paragraph.</p>
</body>
</html>

An external style sheet can be written in any text editor and must be saved with a .css extension. The external .css file (mystyle.css) should not contain any HTML tags — it holds only style rules: [S1]

body {
  background-color: lightblue;
}

h1 {
  color: navy;
  margin-left: 20px;
}

Note: Do not add a space between the property value and the unit. [S1]

Incorrect (space): margin-left: 20 px;
Correct (no space): margin-left: 20px;

🛠️ 적용 사례 (Applied in summary)

The page's own example links an HTML page to mystyle.css, which styles body and h1. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Linking an external stylesheet from the head (language: HTML):

<head>
<link rel="stylesheet" href="mystyle.css">
</head>

The external stylesheet file (language: CSS):

body {
  background-color: lightblue;
}

h1 {
  color: navy;
  margin-left: 20px;
}

⚖️ 비교 및 선택 기준 (Comparison & decision criteria)

Method	How it is added	Best use
External CSS	`<link>` to a `.css` file in `<head>`	Change an entire website's look by editing one file [S1]
Internal CSS	`<style>` element in the head section	A single HTML page with a unique style [S1]
Inline CSS	`style` attribute on an HTML element	A unique style for a single element [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: 0.9
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: CSS Tutorial
관련 개념: CSS Add Internal, CSS Add Inline, CSS Multiple Style Sheets
참조 맥락: Referenced when connecting an HTML page to a centralized, site-wide stylesheet.

📚 출처 (Sources)

[S1] W3Schools — CSS Add External — https://www.w3schools.com/css/css_howto.asp

📝 변경 이력 (Change history)

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

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