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-media-queries
+title: "CSS Media Queries"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["@media rule", "media query", "responsive breakpoints", "min-width max-width CSS", "media types features"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["css", "web", "frontend", "w3schools", "media-queries", "responsive", "at-rules"]
+raw_sources: ["https://www.w3schools.com/css/css3_mediaqueries.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CSS Media Queries]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+CSS media queries apply styles conditionally based on a device's or environment's characteristics (such as viewport width), via the `@media` rule, making them essential for responsive web pages. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **What they do** — media queries allow you to apply styles based on the characteristics of the device or environment displaying the web page. [S1]
+- **Why they matter** — they are essential for creating responsive web pages. [S1]
+- **Mechanism** — the `@media` rule is used to implement media queries. [S1]
+- **Media type is optional** — the media-type is optional unless you use `not`. [S1]
+- **Combining conditions** — a query is true when the type matches and all listed features are true; `and` combines the type with features; `not` inverts the query. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Conditional style block** — wrap rules in `@media … { … }` so they apply only when the conditions match. [S1]
+- **Mobile-then-up pattern** — use `min-width` to add styles as the viewport gets wider. [S1]
+- **Range pattern** — combine `min-width` and `max-width` with `and` to target a width range. [S1]
+
+## 📖 세부 내용 (Details)
+CSS media queries allow you to apply styles based on the characteristics of a device or the environment displaying the web page, and are essential for creating responsive web pages. The `@media` rule is used to implement them. [S1]
+
+**Media query syntax** [S1]
+```css
+@media [not] media-type and (media-feature: value) and (media-feature: value) {
+  /* CSS rules to apply */
+}
+```
+Key points: the media-type is optional unless using `not`; the query is true when the type matches and all features are true; `not` inverts the query; `and` combines the type with features. [S1]
+
+**CSS media types** [S1]
+
+| Value | Description |
+|-------|-------------|
+| `all` | All media type devices |
+| `print` | Print preview mode |
+| `screen` | Computer screens, tablets, smart-phones |
+
+**CSS media features** [S1]
+
+| Value | Description |
+|-------|-------------|
+| `max-height` | Maximum viewport height |
+| `min-height` | Minimum viewport height |
+| `height` | Viewport height (including scrollbar) |
+| `max-width` | Maximum viewport width |
+| `min-width` | Minimum viewport width |
+| `width` | Viewport width (including scrollbar) |
+| `orientation` | Landscape or portrait |
+| `resolution` | Screen resolution |
+| `prefers-color-scheme` | User's preferred color scheme (light/dark) |
+
+**Example 1 — change background if viewport is 480px or wider** [S1]
+```css
+@media screen and (min-width: 480px) {
+  body {
+    background-color: lightgreen;
+  }
+}
+```
+
+**Example 2 — change background if viewport is between 480px and 768px** [S1]
+```css
+@media screen and (min-width: 480px) and (max-width: 768px) {
+  body {
+    background-color: lightgreen;
+  }
+}
+```
+
+## 🛠️ 적용 사례 (Applied in summary)
+The page's applied examples set the `body` background to `lightgreen` once the viewport reaches `480px` (Example 1) and restrict that styling to the `480px–768px` range using `and` with both `min-width` and `max-width` (Example 2). No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Width-up rule (language: CSS):
+```css
+@media screen and (min-width: 480px) {
+  body { background-color: lightgreen; }
+}
+```
+Width-range rule (language: CSS):
+```css
+@media screen and (min-width: 480px) and (max-width: 768px) {
+  body { background-color: lightgreen; }
+}
+```
+
+## ⚖️ 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:** 0.88
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[CSS Tutorial]]
+- **관련 개념:** [[CSS Media Queries Examples]], [[CSS Variables in Media Queries]], [[CSS Flexbox]], [[CSS Box Sizing]]
+- **참조 맥락:** Referenced whenever styles must adapt to viewport size, orientation, print, or user color-scheme preference.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — CSS Media Queries — https://www.w3schools.com/css/css3_mediaqueries.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Media Queries" page (Astra wiki-curation, P-Reinforce v3.1 format).