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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>
149 lines
5.5 KiB
Markdown
149 lines
5.5 KiB
Markdown
---
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id: html-elements
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title: "HTML Elements"
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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: ["HTML element", "start tag", "end tag", "empty element", "nested elements", "HTML tags"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.90
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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", "elements", "tags"]
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raw_sources: ["https://www.w3schools.com/html/html_elements.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[HTML Elements]]
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## 🎯 한 줄 통찰 (One-line insight)
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An HTML element is everything from a start tag to its matching end tag — `<tagname>content</tagname>` — and HTML documents are simply nested elements. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Element = start tag + content + end tag** — e.g. `<h1>My First Heading</h1>`. [S1]
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- **Some elements are empty** — they have no content and no end tag (e.g. `<br>`); these are called empty elements. [S1]
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- **Elements nest** — elements can contain other elements; all HTML documents consist of nested HTML elements. [S1]
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- **Tags are not case sensitive** — `<P>` means the same as `<p>`, but W3Schools recommends lowercase. [S1]
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- **Don't skip the end tag** — even if some browsers tolerate a missing end tag, never rely on it; unexpected results and errors may occur. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Three-part element** — `<tag>` … content … `</tag>`. [S1]
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- **Empty element** — `<br>` style tags with no closing tag. [S1]
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- **Nesting / containment** — `<html>` wraps `<body>`, which wraps `<h1>`, `<p>`, etc. [S1]
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- **Lowercase convention** — write tags in lowercase even though HTML is case-insensitive. [S1]
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## 📖 세부 내용 (Details)
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**What is an HTML element?**
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An HTML element is defined by a start tag, some content, and an end tag: [S1]
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```html
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<tagname>Content goes here...</tagname>
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```
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The HTML element is everything from the start tag to the end tag. Examples: [S1]
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```html
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<h1>My First Heading</h1>
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```
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```html
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<p>My first paragraph.</p>
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```
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The element structure can be broken into three parts: the start tag, the element content, and the end tag. For `<h1>My First Heading</h1>`, the start tag is `<h1>`, the content is "My First Heading", and the end tag is `</h1>`. [S1]
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**Nested HTML Elements**
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HTML elements can be nested (this means that elements can contain other elements). All HTML documents consist of nested HTML elements. The following example contains four HTML elements (`<html>`, `<body>`, `<h1>`, and `<p>`): [S1]
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```html
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<!DOCTYPE html>
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<html>
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<body>
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<h1>My First Heading</h1>
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<p>My first paragraph.</p>
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</body>
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</html>
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```
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**Never Skip the End Tag**
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Some HTML elements will display correctly even if you forget the end tag: [S1]
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```html
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<html>
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<body>
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<p>This is a paragraph
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<p>This is a paragraph
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</body>
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</html>
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```
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> **Note:** Never rely on this. Unexpected results and errors may occur if you forget the end tag. [S1]
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**Empty HTML Elements**
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HTML elements with no content are called empty elements. The `<br>` tag defines a line break and is an empty element without a closing tag. [S1]
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```html
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<p>This is a <br> paragraph with a line break.</p>
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```
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**HTML is Not Case Sensitive**
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HTML tags are not case sensitive: `<P>` means the same as `<p>`. The HTML standard does not require lowercase tags, but W3Schools recommends lowercase in HTML and demands lowercase for stricter document types like XHTML. [S1]
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**Tag reference**
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| Tag | Description |
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|---|---|
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| `<html>` | Defines the root of an HTML document |
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| `<body>` | Defines the document's body |
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| `<h1>` to `<h6>` | Defines HTML headings |
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A complete list of all available HTML tags is available in the HTML Tag Reference. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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The nested-document example above demonstrates how the element model composes a full page from `<html>`/`<body>`/`<h1>`/`<p>`. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Element pattern (HTML):
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```html
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<tagname>Content goes here...</tagname>
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```
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Nested elements forming a document:
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```html
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<!DOCTYPE html>
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<html>
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<body>
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<h1>My First Heading</h1>
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<p>My first paragraph.</p>
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</body>
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</html>
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```
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Empty element inside a paragraph:
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```html
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<p>This is a <br> paragraph with a line break.</p>
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```
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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The source notes a tolerated-but-discouraged behavior: browsers may render some elements correctly even without an end tag, but this must never be relied upon. HTML is case-insensitive for tags, yet lowercase is the recommended (and, for XHTML, required) convention. [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:** 0.90
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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 Introduction]], [[HTML Basic]], [[HTML Attributes]], [[HTML Paragraphs]]
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- **참조 맥락:** Referenced whenever explaining what a tag, element, or nesting structure means in any page.
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## 📚 출처 (Sources)
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- [S1] W3Schools — HTML Elements — https://www.w3schools.com/html/html_elements.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "HTML Elements" page (Astra wiki-curation, P-Reinforce v3.1 format).
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