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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>
5.5 KiB
id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit
| id | title | category | status | verification_status | canonical_id | aliases | duplicate_of | source_trust_level | confidence_score | created_at | updated_at | review_reason | merge_history | tags | raw_sources | applied_in | github_commit | |||||||||||||
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| html-elements | HTML Elements | Frontend | draft | conceptual |
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B | 0.90 | 2026-06-23 | 2026-06-23 |
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HTML Elements
🎯 한 줄 통찰 (One-line insight)
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]
🧠 핵심 개념 (Core concepts)
- Element = start tag + content + end tag — e.g.
<h1>My First Heading</h1>. [S1] - Some elements are empty — they have no content and no end tag (e.g.
<br>); these are called empty elements. [S1] - Elements nest — elements can contain other elements; all HTML documents consist of nested HTML elements. [S1]
- Tags are not case sensitive —
<P>means the same as<p>, but W3Schools recommends lowercase. [S1] - 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]
🧩 추출된 패턴 (Extracted patterns)
- Three-part element —
<tag>… content …</tag>. [S1] - Empty element —
<br>style tags with no closing tag. [S1] - Nesting / containment —
<html>wraps<body>, which wraps<h1>,<p>, etc. [S1] - Lowercase convention — write tags in lowercase even though HTML is case-insensitive. [S1]
📖 세부 내용 (Details)
What is an HTML element? An HTML element is defined by a start tag, some content, and an end tag: [S1]
<tagname>Content goes here...</tagname>
The HTML element is everything from the start tag to the end tag. Examples: [S1]
<h1>My First Heading</h1>
<p>My first paragraph.</p>
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]
Nested HTML Elements
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]
<!DOCTYPE html>
<html>
<body>
<h1>My First Heading</h1>
<p>My first paragraph.</p>
</body>
</html>
Never Skip the End Tag Some HTML elements will display correctly even if you forget the end tag: [S1]
<html>
<body>
<p>This is a paragraph
<p>This is a paragraph
</body>
</html>
Note: Never rely on this. Unexpected results and errors may occur if you forget the end tag. [S1]
Empty HTML Elements
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]
<p>This is a <br> paragraph with a line break.</p>
HTML is Not Case Sensitive
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]
Tag reference
| Tag | Description |
|---|---|
<html> |
Defines the root of an HTML document |
<body> |
Defines the document's body |
<h1> to <h6> |
Defines HTML headings |
A complete list of all available HTML tags is available in the HTML Tag Reference. [S1]
🛠️ 적용 사례 (Applied in summary)
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.
💻 코드 패턴 (Code patterns)
Element pattern (HTML):
<tagname>Content goes here...</tagname>
Nested elements forming a document:
<!DOCTYPE html>
<html>
<body>
<h1>My First Heading</h1>
<p>My first paragraph.</p>
</body>
</html>
Empty element inside a paragraph:
<p>This is a <br> paragraph with a line break.</p>
⚖️ 모순 및 업데이트 (Contradictions & updates)
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]
✅ 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: 0.90
- 중복 검사 결과: 신규 생성 (New discovery)
🔗 지식 그래프 (Knowledge Graph)
- 상위/루트: HTML Tutorial
- 관련 개념: HTML Introduction, HTML Basic, HTML Attributes, HTML Paragraphs
- 참조 맥락: Referenced whenever explaining what a tag, element, or nesting structure means in any page.
📚 출처 (Sources)
- [S1] W3Schools — HTML Elements — https://www.w3schools.com/html/html_elements.asp
📝 변경 이력 (Change history)
- 2026-06-23: Initial draft synthesized from the W3Schools "HTML Elements" page (Astra wiki-curation, P-Reinforce v3.1 format).