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>
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id: html-introduction
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title: "HTML Introduction"
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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", "HyperText Markup Language", "HTML5", "markup language", "HTML intro"]
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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", "markup", "w3schools"]
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raw_sources: ["https://www.w3schools.com/html/html_intro.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[HTML Introduction]]
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## 🎯 한 줄 통찰 (One-line insight)
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HTML (HyperText Markup Language) is the standard markup language that describes the *structure* of a web page through a series of elements that tell the browser how to display content. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **HTML = HyperText Markup Language** — the standard markup language for creating web pages. It describes the *structure* of a page, not its logic or styling. [S1]
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- **Elements** — HTML is a series of elements that label pieces of content (headings, paragraphs, links, …) so the browser knows how to render them. [S1]
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- **The browser's role** — a web browser (Chrome, Edge, Firefox, Safari) reads HTML and displays it. The browser does **not** show the tags themselves; it uses them to decide how to render the document. [S1]
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- **Document skeleton** — every HTML5 document opens with `<!DOCTYPE html>` and nests content inside `<html>` → `<head>` (meta info) and `<body>` (visible content). [S1]
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- **HTML5** — the current standard this tutorial follows. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Element pattern** — `<tagname>content</tagname>`: a start tag, content, and an end tag (e.g. `<h1>My First Heading</h1>`). [S1]
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- **Empty elements** — some elements have no content and no end tag (e.g. `<br>`). [S1]
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- **Nesting / containment** — `<head>` holds metadata (like `<title>`); `<body>` holds everything visible; `<html>` is the single root that wraps both. [S1]
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- **Title surfacing** — `<title>` content appears in the browser's title bar / tab, not in the page body. [S1]
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## 📖 세부 내용 (Details)
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**What is HTML?**
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HTML stands for **Hyper Text Markup Language** and is the standard markup language for creating web pages. It describes the structure of a web page using a series of elements, which tell the browser how to display the content. Elements label pieces of content such as "this is a heading", "this is a paragraph", "this is a link", and so on. [S1]
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**A simple HTML document**
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```html
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<!DOCTYPE html>
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<html>
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<head>
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<title>Page Title</title>
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</head>
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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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Each part explained: [S1]
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| Part | Meaning |
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|---|---|
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| `<!DOCTYPE html>` | Declares that this document is an HTML5 document |
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| `<html>` | The root element of an HTML page |
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| `<head>` | Contains meta information about the page |
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| `<title>` | Specifies a title shown in the browser's title bar / tab |
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| `<body>` | The document body — container for all visible content |
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| `<h1>` | Defines a large heading |
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| `<p>` | Defines a paragraph |
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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: `<tagname>Content goes here...</tagname>`. Examples: `<h1>My First Heading</h1>`, `<p>My first paragraph.</p>`. Some elements are *empty* (like `<br>`) — they have no content and no end tag. [S1]
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**Web browsers**
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The purpose of a web browser (Chrome, Edge, Firefox, Safari) is to read HTML documents and display them correctly. A browser does not display the HTML tags but uses them to determine how to render the document. [S1]
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**HTML page structure**
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A visualization of an HTML page's nesting:
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```html
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<html>
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<head>
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<title>Page title</title>
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</head>
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<body>
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<h1>This is a heading</h1>
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<p>This is a paragraph.</p>
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<p>This is another paragraph.</p>
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</body>
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</html>
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```
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Content inside `<body>` is displayed by the browser; content inside `<title>` appears in the title bar / tab. [S1]
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**HTML history**
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| Year | Milestone |
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|---|---|
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| 1989 | Tim Berners-Lee invented the WWW |
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| 1991 | Tim Berners-Lee invented HTML |
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| 1993 | Dave Raggett drafted HTML+ |
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| 1995 | HTML Working Group defined HTML 2.0 |
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| 1997 | W3C Recommendation: HTML 3.2 |
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| 1999 | W3C Recommendation: HTML 4.01 |
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| 2000 | W3C Recommendation: XHTML 1.0 |
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| 2008 | WHATWG HTML5 First Public Draft |
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| 2012 | WHATWG HTML5 Living Standard |
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| 2014 | W3C Recommendation: HTML5 |
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| 2016 | W3C Candidate Recommendation: HTML 5.1 |
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| 2017 | W3C Recommendations: HTML5.1 2nd Edition & HTML5.2 |
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This tutorial follows the latest HTML5 standard. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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The "simple HTML document" above is itself the canonical minimal applied example: a complete, valid HTML5 page. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Minimal valid HTML5 page (HTML / HTML5):
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```html
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<!DOCTYPE html>
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<html>
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<head>
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<title>Page Title</title>
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</head>
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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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Single element pattern:
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```html
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<h1>My First Heading</h1>
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```
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Empty element (no end tag):
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```html
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<br>
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```
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source. Note the historical shift of HTML stewardship: HTML5 began as a WHATWG draft (2008) and "Living Standard" (2012) before the W3C Recommendation (2014) — reflecting that modern HTML is maintained as a continuously updated living standard rather than fixed versioned releases. [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 Elements]], [[HTML Basic]], [[HTML Attributes]], [[HTML vs XHTML]]
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- **참조 맥락:** The entry point referenced whenever building or explaining the structure of any web page.
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## 📚 출처 (Sources)
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- [S1] W3Schools — HTML Introduction — https://www.w3schools.com/html/html_intro.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "HTML Introduction" page (Astra wiki-curation, P-Reinforce v3.1 format).
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