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10_Wiki/Topics/Topic_Programming/Topic_W3CSS/W3CSS_Alerts.md

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+---
+id: w3css-alerts
+title: "W3CSS Alerts"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["alert boxes", "× close button", "W3.CSS 알림"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["w3css", "css-framework", "w3schools", "alerts"]
+raw_sources: ["https://www.w3schools.com/w3css/w3css_alerts.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[W3CSS Alerts]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The source explicitly prefers the `×` HTML entity over the literal letter "X" for close buttons — a small but deliberate detail, since `×` renders as a proper multiplication-style cross symbol rather than relying on the letter X looking "close enough," making the close affordance visually distinct from actual text content. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **No dedicated alert class** — alerts are `w3-panel` + a STRONG (saturated) color, contrasted against Notes' PALE colors. [S1]
+- **Semantic color convention** — red (danger), yellow (warning), green (success), blue (information) — though any color can technically be used. [S1]
+- **Dismissible via inline `onclick`** — `this.parentElement.style.display='none'` on a `w3-button w3-display-topright` span containing `×`. [S1]
+- **`×` preferred over literal "X"** — explicitly recommended as the standard close-icon character. [S1]
+- **Composable with rounding and cards** — `w3-round`/`w3-round-large`/`w3-round-xxlarge` or `w3-card-4` can be layered onto an alert panel. [S1]
+
+## 📖 세부 내용 (Details)
+- Strong-color alert (Danger): `<div class="w3-panel w3-red"><h3>Danger!</h3><p>Red often indicates a dangerous or negative situation.</p></div>`. [S1]
+- Dismiss button: `<span onclick="this.parentElement.style.display='none'" class="w3-button w3-display-topright">&times;</span>`. [S1]
+- Rounded alert: `<div class="w3-panel w3-green w3-round">`. [S1]
+- Card-style alert: `<div class="w3-panel w3-yellow w3-card-4">`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **닫기 아이콘 권장사항**: 닫기 버튼에는 문자 "X"보다 &times; HTML 엔티티가 선호된다는 점이 팁으로 명시됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — onclick 인라인 이벤트만으로 별도 JS 파일 없이 알림을 닫는 것이 경량 UI 인터랙션의 대표 사례다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Dismissible alert using the &times; entity (HTML):
+```html
+<div class="w3-panel w3-red w3-display-container">
+  <span onclick="this.parentElement.style.display='none'"
+        class="w3-button w3-display-topright">&times;</span>
+  <h3>Danger!</h3>
+  <p>Red often indicates a dangerous or negative situation.</p>
+</div>
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **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:** [[W3.CSS Tutorial]]
+- **관련 개념:** [[W3CSS Quotes]], [[W3CSS Panels]], [[W3CSS Tables]]
+- **참조 맥락:** Buttons & Content Blocks 섹션의 마지막 — 테이블(Tables) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — W3.CSS Alerts — https://www.w3schools.com/w3css/w3css_alerts.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "W3.CSS Alerts" page (Astra wiki-curation, P-Reinforce v3.1 format).