---
id: css-important
title: "CSS !important"
category: "Frontend"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["!important", "important rule", "CSS override priority", "important declaration", "highest priority CSS"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.87
created_at: 2026-06-23
updated_at: 2026-06-23
review_reason: ""
merge_history: []
tags: ["css", "web", "frontend", "w3schools", "important", "cascade", "specificity"]
raw_sources: ["https://www.w3schools.com/css/css_important.asp"]
applied_in: []
github_commit: ""
---

# [[CSS !important]]

## 🎯 한 줄 통찰 (One-line insight)
The `!important` rule forces a CSS property value to the highest priority, overriding every other styling rule for that property on an element — powerful, but to be used sparingly. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Highest priority** — `!important` assigns the highest priority to a CSS property value, overriding all previous styling rules for that specific property on an element. [S1]
- **Overrides specificity** — an `!important` declaration beats inline styles, ID selectors, and class selectors even though those would normally have higher specificity. [S1]
- **Use sparingly** — overusing `!important` creates confusing, difficult-to-debug CSS code. [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **Property-level override pattern** — append `!important` to a single declaration (`property: value !important;`) to lock that one property's value. [S1]
- **Accessibility escape hatch** — pairing `!important` with a `prefers-reduced-motion` media query guarantees motion is suppressed for users who request it. [S1]

## 📖 세부 내용 (Details)
**What `!important` does.** The `!important` rule assigns the highest priority to a CSS property value, overriding all previous styling rules for that specific property on an element. [S1]

**Syntax.** [S1]
```css
selector {
  property: value !important;
}
```

**Example — basic override.** When `background-color: yellow !important;` is applied to paragraphs, all the paragraphs display a yellow background regardless of inline styles, ID selectors, or class selectors that would otherwise have higher specificity. [S1]
```css
p {
  background-color: yellow !important;
}
```

**Example — accessibility / reduced motion.** `!important` is used to respect a user's motion-sensitivity preference, forcing animations and transitions off for everyone who requests reduced motion. [S1]
```css
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}
```

**Other examples on the page.** The page also shows competing/multiple `!important` declarations across different selectors (illustrating how this can create confusing CSS) and a link-button styling case where `!important` enforces consistent styling across conflicting selectors. The exact additional source code for these boxes was not captured verbatim from the source. [S1] (Not found in source — verbatim code.)

**Fair use cases.** The page lists legitimate reasons to use `!important` [S1]:
1. Overriding styles in a Content Management System (CMS) where the CSS cannot be edited directly.
2. Respecting user accessibility preferences (such as reduced motion).
3. Creating unchangeable styles for specific elements.

**Warning.** Use `!important` sparingly — excessive use creates confusing, difficult-to-debug CSS code. [S1]

## 🛠️ 적용 사례 (Applied in summary)
The page's applied demonstrations include forcing a yellow paragraph background over higher-specificity rules, and the `prefers-reduced-motion` accessibility block that kills animations and transitions. No external project/commit applications found in the source.

## 💻 코드 패턴 (Code patterns)
Locking a single property (language: CSS):
```css
selector {
  property: value !important;
}
```
Accessibility-driven blanket override (language: CSS):
```css
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}
```

## ⚖️ 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:** 0.87
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[CSS Tutorial]]
- **관련 개념:** [[CSS Specificity]], [[CSS Specificity Hierarchy]], [[CSS Accessibility]]
- **참조 맥락:** Reached for when a style must override everything else, or when ruling out an `!important` rule as the cause of an un-overridable style.

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

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