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>

10_Wiki/Topic_HTML/HTML_JavaScript.md

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+---
+id: html-javascript
+title: "HTML JavaScript"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["script tag", "HTML script", "noscript", "client-side script", "JavaScript in HTML"]
+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: ["html", "web", "frontend", "w3schools", "javascript"]
+raw_sources: ["https://www.w3schools.com/html/html_scripts.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[HTML JavaScript]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The HTML `<script>` tag embeds client-side JavaScript that can dynamically change a page's content, styles, and attributes, while `<noscript>` supplies fallback content when scripting is unavailable. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`<script>` defines a client-side script** — JavaScript that runs in the browser. [S1]
+- **Inline or external** — the `<script>` element either contains script statements, or points to an external script file through the `src` attribute. [S1]
+- **What JavaScript can do** — common uses include image manipulation, form validation, and dynamic changes of content. [S1]
+- **Changing content/style/attributes** — JavaScript can set an element's `innerHTML`, its `style` properties, and its attributes (e.g. an image `src`). [S1]
+- **`<noscript>` fallback** — defines alternate content to display to users who have disabled scripts or whose browser doesn't support scripts. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Content-change pattern** — select an element by id and set its `innerHTML`. [S1]
+- **Style-change pattern** — set `style.fontSize`, `style.color`, `style.backgroundColor`, etc. on a selected element. [S1]
+- **Attribute-change pattern** — set an element attribute such as an image `src`. [S1]
+- **Graceful-degradation pattern** — pair a `<script>` with a `<noscript>` block for non-scripting browsers. [S1]
+
+## 📖 세부 내용 (Details)
+**The HTML `<script>` Tag.** The HTML `<script>` tag is used to define a client-side script (JavaScript). The `<script>` element either contains script statements, or it points to an external script file through the `src` attribute. Common uses for JavaScript are image manipulation, form validation, and dynamic changes of content. [S1]
+
+To select an HTML element, JavaScript often uses `document.getElementById(id)`. This JavaScript example writes "Hello JavaScript!" into an HTML element with `id="demo"`: [S1]
+```javascript
+<script>
+document.getElementById("demo").innerHTML = "Hello JavaScript!";
+</script>
+```
+
+**A Taste of JavaScript.** JavaScript can change content: [S1]
+```javascript
+document.getElementById("demo").innerHTML = "Hello JavaScript!";
+```
+JavaScript can change styles: [S1]
+```javascript
+document.getElementById("demo").style.fontSize = "25px";
+document.getElementById("demo").style.color = "red";
+document.getElementById("demo").style.backgroundColor = "yellow";
+```
+JavaScript can change attributes (here, an image source): [S1]
+```javascript
+document.getElementById("image").src = "picture.gif";
+```
+
+**The HTML `<noscript>` Tag.** The HTML `<noscript>` tag defines an alternate content to be displayed to users that have disabled scripts in their browser or have a browser that doesn't support scripts. [S1]
+```javascript
+<script>
+document.getElementById("demo").innerHTML = "Hello JavaScript!";
+</script>
+<noscript>Sorry, your browser does not support JavaScript!</noscript>
+```
+
+**HTML Script Tags.** [S1]
+
+| Tag | Description |
+|---|---|
+| `<script>` | Defines a client-side script |
+| `<noscript>` | Defines an alternate content for users that do not support client-side scripts |
+
+## 🛠️ 적용 사례 (Applied in summary)
+The `innerHTML` content swap, the style changes (font size / color / background), the image `src` change, and the `<noscript>` fallback are the canonical applied examples. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Inline script changing content (HTML + JS):
+```html
+<script>
+document.getElementById("demo").innerHTML = "Hello JavaScript!";
+</script>
+```
+Change style via JS:
+```javascript
+document.getElementById("demo").style.color = "red";
+```
+Fallback for no-script browsers (HTML):
+```html
+<noscript>Sorry, your browser does not support JavaScript!</noscript>
+```
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+No contradictions found in the source. [S1]
+
+## ✅ 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:** [[HTML Tutorial]]
+- **관련 개념:** [[HTML Id]], [[HTML Classes]], [[HTML Div]], [[HTML Iframes]]
+- **참조 맥락:** Referenced whenever a page needs client-side behavior — dynamic content, styling, validation — or a no-script fallback.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — HTML JavaScript — https://www.w3schools.com/html/html_scripts.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "HTML JavaScript" page (Astra wiki-curation, P-Reinforce v3.1 format).