---
id: css-syntax
title: "CSS Syntax"
category: "Frontend"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["CSS rule", "CSS declaration", "selector and declaration block", "CSS property value", "CSS rule syntax"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.9
created_at: 2026-06-23
updated_at: 2026-06-23
review_reason: ""
merge_history: []
tags: ["css", "web", "frontend", "w3schools", "syntax"]
raw_sources: ["https://www.w3schools.com/css/css_syntax.asp"]
applied_in: []
github_commit: ""
---

# [[CSS Syntax]]

## 🎯 한 줄 통찰 (One-line insight)
A CSS rule is made of a selector that points to the HTML element to style and a declaration block containing one or more `property: value;` declarations, separated by semicolons and surrounded by curly braces. [S1]

## 🧠 핵심 개념 (Core concepts)
- **A CSS rule has two parts** — a selector and a declaration block. [S1]
- **Selector** — points to the HTML element you want to style. [S1]
- **Declaration block** — contains one or more declarations separated by semicolons. [S1]
- **Declaration** — includes a CSS property name and a value, separated by a colon. [S1]
- **Punctuation** — multiple CSS declarations are separated with semicolons, and declaration blocks are surrounded by curly braces. [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **Rule pattern** — `selector { property: value; property: value; }`. [S1]
- **Declaration pattern** — each declaration pairs a property and a value with a colon: `property: value;`. [S1]

## 📖 세부 내용 (Details)
A CSS rule consists of a **selector** and a **declaration block**. [S1]

The selector points to the HTML element you want to style. The declaration block contains one or more declarations separated by semicolons. Each declaration includes a CSS property name and a value, separated by a colon. Multiple CSS declarations are separated with semicolons, and declaration blocks are surrounded by curly braces. [S1]

**Example** [S1]
```css
p {
  color: red;
  text-align: center;
}
```

In this example: [S1]
- `p` is the selector (it targets HTML `<p>` paragraph elements).
- `color` is a property, and `red` is its value.
- `text-align` is a property, and `center` is its value.

The rule above makes all paragraph text red and center-aligned. [S1]

## 🛠️ 적용 사례 (Applied in summary)
The `p` rule above is the page's own applied example: a complete rule styling paragraph elements with `color` and `text-align`. No external project/commit applications found in the source.

## 💻 코드 패턴 (Code patterns)
Basic CSS rule structure (language: CSS):
```css
selector {
  property: value;
  property: value;
}
```
Concrete example:
```css
p {
  color: red;
  text-align: center;
}
```

## ⚖️ 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 Introduction]], [[CSS Selectors]], [[CSS Add Internal]]
- **참조 맥락:** The grammar underlying every CSS rule; referenced whenever writing or reading any selector and declaration.

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

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