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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>
119 lines
5.3 KiB
Markdown
119 lines
5.3 KiB
Markdown
---
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id: html-javascript
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title: "HTML JavaScript"
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category: "Frontend"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["script tag", "HTML script", "noscript", "client-side script", "JavaScript in HTML"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.88
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created_at: 2026-06-23
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updated_at: 2026-06-23
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review_reason: ""
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merge_history: []
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tags: ["html", "web", "frontend", "w3schools", "javascript"]
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raw_sources: ["https://www.w3schools.com/html/html_scripts.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[HTML JavaScript]]
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## 🎯 한 줄 통찰 (One-line insight)
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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]
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## 🧠 핵심 개념 (Core concepts)
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- **`<script>` defines a client-side script** — JavaScript that runs in the browser. [S1]
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- **Inline or external** — the `<script>` element either contains script statements, or points to an external script file through the `src` attribute. [S1]
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- **What JavaScript can do** — common uses include image manipulation, form validation, and dynamic changes of content. [S1]
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- **Changing content/style/attributes** — JavaScript can set an element's `innerHTML`, its `style` properties, and its attributes (e.g. an image `src`). [S1]
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- **`<noscript>` fallback** — defines alternate content to display to users who have disabled scripts or whose browser doesn't support scripts. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Content-change pattern** — select an element by id and set its `innerHTML`. [S1]
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- **Style-change pattern** — set `style.fontSize`, `style.color`, `style.backgroundColor`, etc. on a selected element. [S1]
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- **Attribute-change pattern** — set an element attribute such as an image `src`. [S1]
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- **Graceful-degradation pattern** — pair a `<script>` with a `<noscript>` block for non-scripting browsers. [S1]
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## 📖 세부 내용 (Details)
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**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]
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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]
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```javascript
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<script>
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document.getElementById("demo").innerHTML = "Hello JavaScript!";
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</script>
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```
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**A Taste of JavaScript.** JavaScript can change content: [S1]
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```javascript
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document.getElementById("demo").innerHTML = "Hello JavaScript!";
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```
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JavaScript can change styles: [S1]
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```javascript
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document.getElementById("demo").style.fontSize = "25px";
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document.getElementById("demo").style.color = "red";
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document.getElementById("demo").style.backgroundColor = "yellow";
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```
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JavaScript can change attributes (here, an image source): [S1]
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```javascript
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document.getElementById("image").src = "picture.gif";
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```
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**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]
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```javascript
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<script>
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document.getElementById("demo").innerHTML = "Hello JavaScript!";
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</script>
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<noscript>Sorry, your browser does not support JavaScript!</noscript>
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```
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**HTML Script Tags.** [S1]
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| Tag | Description |
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|---|---|
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| `<script>` | Defines a client-side script |
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| `<noscript>` | Defines an alternate content for users that do not support client-side scripts |
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## 🛠️ 적용 사례 (Applied in summary)
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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.
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## 💻 코드 패턴 (Code patterns)
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Inline script changing content (HTML + JS):
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```html
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<script>
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document.getElementById("demo").innerHTML = "Hello JavaScript!";
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</script>
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```
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Change style via JS:
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```javascript
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document.getElementById("demo").style.color = "red";
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```
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Fallback for no-script browsers (HTML):
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```html
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<noscript>Sorry, your browser does not support JavaScript!</noscript>
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```
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source. [S1]
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.88
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[HTML Tutorial]]
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- **관련 개념:** [[HTML Id]], [[HTML Classes]], [[HTML Div]], [[HTML Iframes]]
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- **참조 맥락:** Referenced whenever a page needs client-side behavior — dynamic content, styling, validation — or a no-script fallback.
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## 📚 출처 (Sources)
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- [S1] W3Schools — HTML JavaScript — https://www.w3schools.com/html/html_scripts.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "HTML JavaScript" page (Astra wiki-curation, P-Reinforce v3.1 format).
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