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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+---
+id: css-add-inline
+title: "CSS Add Inline"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["inline CSS", "inline style", "style attribute", "element-level style", "single element styling"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.89
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["css", "web", "frontend", "w3schools", "stylesheet"]
+raw_sources: ["https://www.w3schools.com/css/css_howto_inline.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CSS Add Inline]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+An inline style applies a unique style to a single element via its `style` attribute, but it loses many advantages of a style sheet by mixing content with presentation, so it should be used sparingly. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Purpose** — an inline style may be used to apply a unique style for a single element. [S1]
+- **Mechanism** — to use inline styles, add the `style` attribute to the relevant element. [S1]
+- **Content** — the `style` attribute can contain any CSS property declarations. [S1]
+- **Caveat** — an inline style loses many of the advantages of a style sheet (by mixing content with presentation); use this method sparingly. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Per-element override** — attach declarations directly to one element via `style="property:value;…"`. [S1]
+- **Use sparingly** — prefer external/internal sheets to keep content and presentation separate. [S1]
+
+## 📖 세부 내용 (Details)
+An inline style may be used to apply a unique style for a single element. To use inline styles, add the `style` attribute to the relevant element. The `style` attribute can contain any CSS property. [S1]
+
+```html
+<!DOCTYPE html>
+<html>
+<body>
+
+<h1 style="color:blue;text-align:center;">This is a heading</h1>
+<p style="color:red;">This is a paragraph.</p>
+
+</body>
+</html>
+```
+
+Here the `<h1>` element is given blue, center-aligned text, and the `<p>` element is given red text — all directly through their `style` attributes. [S1]
+
+**Tip:** An inline style loses many of the advantages of a style sheet (by mixing content with presentation). Use this method sparingly. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+The page's own example applies inline styles to an `<h1>` (blue, centered) and a `<p>` (red). No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Inline style via the style attribute (language: HTML):
+```html
+<h1 style="color:blue;text-align:center;">This is a heading</h1>
+<p style="color:red;">This is a paragraph.</p>
+```
+
+## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
+| Method | How it is added | Best use |
+| --- | --- | --- |
+| External CSS | `<link>` to a `.css` file | Style an entire website from one file [S1] |
+| Internal CSS | `<style>` element in the head | A single page with a unique style [S1] |
+| Inline CSS | `style` attribute on an element | A unique style for a single element; use sparingly [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:** 0.89
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[CSS Tutorial]]
+- **관련 개념:** [[CSS Add External]], [[CSS Add Internal]], [[CSS Multiple Style Sheets]]
+- **참조 맥락:** Referenced when styling one element directly, and as the highest-priority source in the cascade.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — CSS Add Inline — https://www.w3schools.com/css/css_howto_inline.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Add Inline" page (Astra wiki-curation, P-Reinforce v3.1 format).