---
id: css-add-internal
title: "CSS Add Internal"
category: "Frontend"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["internal CSS", "internal style sheet", "style element", "embedded CSS", "head style block"]
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_internal.asp"]
applied_in: []
github_commit: ""
---

# [[CSS Add Internal]]

## 🎯 한 줄 통찰 (One-line insight)
An internal style sheet may be used when a single HTML page has a unique style; it is defined inside a `<style>` element placed within the page's `<head>` section. [S1]

## 🧠 핵심 개념 (Core concepts)
- **When to use** — an internal style sheet may be used if one single HTML page has a unique style. [S1]
- **Where it lives** — the internal style is defined inside the `<style>` element, placed within the `<head>` section of an HTML page. [S1]
- **Scope** — the styles apply to that one page only. [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **Single-page styling** — embed page-specific rules in a `<style>` block in the head instead of an external file. [S1]
- **Standard rules inside** — the `<style>` block contains the same `selector { property: value; }` rules as any stylesheet. [S1]

## 📖 세부 내용 (Details)
An internal style sheet may be used if one single HTML page has a unique style. The internal style is defined inside the `<style>` element, inside the head section. [S1]

```html
<!DOCTYPE html>
<html>
<head>
<style>
body {
  background-color: linen;
}

h1 {
  color: maroon;
  margin-left: 40px;
}
</style>
</head>
<body>

<h1>This is a heading</h1>
<p>This is a paragraph.</p>

</body>
</html>
```

In this example the `body` element gets a `linen` background color, and the `h1` element is styled with `maroon` text and a 40-pixel left margin. [S1]

## 🛠️ 적용 사례 (Applied in summary)
The page's own example embeds a `<style>` block in the head to style `body` and `h1` for one page. No external project/commit applications found in the source.

## 💻 코드 패턴 (Code patterns)
Internal style sheet in the head (language: HTML):
```html
<head>
<style>
body {
  background-color: linen;
}

h1 {
  color: maroon;
  margin-left: 40px;
}
</style>
</head>
```

## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
| Method | Where defined | 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 HTML page with a unique style [S1] |
| Inline CSS | `style` attribute on an 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:** 0.89
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[CSS Tutorial]]
- **관련 개념:** [[CSS Add External]], [[CSS Add Inline]], [[CSS Multiple Style Sheets]]
- **참조 맥락:** Referenced when one page needs its own styles without an external file.

## 📚 출처 (Sources)
- [S1] W3Schools — CSS Add Internal — https://www.w3schools.com/css/css_howto_internal.asp

## 📝 변경 이력 (Change history)
- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Add Internal" page (Astra wiki-curation, P-Reinforce v3.1 format).
