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>
2026-06-23 19:21:18 +09:00
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+---
+id: html-web-apis
+title: "HTML Web APIs"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["Web API", "Application Programming Interface", "HTML5 APIs", "browser APIs", "third party APIs"]
+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", "api", "html5"]
+raw_sources: ["https://www.w3schools.com/html/html5_api_whatis.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[HTML Web APIs]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+A Web API is an application programming interface for the Web that extends browser functionality and provides easy syntax to otherwise complex code; modern browsers ship several built-in Web APIs. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **API = Application Programming Interface** — an interface that includes a set of functions and subroutines allowing programmers to access specific features or data of an application, operating system, or other service. [S1]
+- **Web API** — an application programming interface for the Web. It can extend the functionality of the browser, greatly simplify complex functions, and provide easy syntax to complex code. [S1]
+- **Built into the browser** — all browsers include a set of built-in Web APIs. [S1]
+- **Third party APIs** — APIs that are not built into the browser; to use them you download the code from the Web. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Browser-native vs third-party** — distinguish built-in APIs (Geolocation, Drag and Drop, Web Storage, Web Workers, Server-Sent Events, Canvas) from third-party APIs you must import (YouTube, Twitter, Facebook). [S1]
+- **API as an abstraction layer** — the API hides complex underlying code behind a simpler, accessible syntax. [S1]
+
+## 📖 세부 내용 (Details)
+**What is a Web API?**
+API stands for **A**pplication **P**rogramming **I**nterface. An API is some kind of interface that includes a set of functions and subroutines that allow programmers to access specific features or data of an application, operating system, or other services. A Web API is an application programming interface for the Web. [S1]
+
+**What Web APIs can do**
+A Web API: [S1]
+- Can extend the functionality of the browser
+- Can greatly simplify complex functions
+- Can provide easy syntax to complex code
+
+**Browser APIs**
+All browsers include a set of built-in Web APIs. The Web APIs covered in this tutorial are: [S1]
+
+| API | Purpose |
+|---|---|
+| Geolocation API | Used to access the current location of a user (with latitude and longitude) |
+| Drag and Drop API | Enables you to use drag-and-drop features in browsers |
+| Web Storage API | Mechanisms to let browsers store key/value pairs (in a more intuitive way than cookies) |
+| Web Workers API | Allows a JavaScript to run in the background, without affecting the performance of the page |
+| Server-Sent Events API | Allows a web page to automatically get updates from a server |
+| Canvas API | Lets you draw graphics, on the fly, via JavaScript |
+
+**Third party APIs**
+Third party APIs are not built into your browser. To use these APIs, you will have to download the code from the Web. Examples include: [S1]
+- YouTube API
+- Twitter API
+- Facebook API
+
+## 🛠️ 적용 사례 (Applied in summary)
+This page is an index/overview; its "applied" value is orientation — it points to the concrete API topics (Geolocation, Drag and Drop, Web Storage, Web Workers, SSE, Canvas) that each carry their own examples. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Not found in source — this overview page presents no code examples; concrete usage lives in the individual API topic pages (e.g. [[HTML Geolocation]], [[HTML Web Storage]]).
+
+## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
+The page distinguishes two categories of Web APIs, which guides where the implementing code comes from: [S1]
+
+| Category | Built into browser? | How to use |
+|---|---|---|
+| Browser (built-in) APIs | Yes | Available natively (Geolocation, Drag and Drop, Web Storage, Web Workers, SSE, Canvas) |
+| Third party APIs | No | Download the code from the Web (e.g. YouTube, Twitter, Facebook) |
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+No contradictions found in the source.
+
+## ✅ 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 Geolocation]], [[HTML Drag and Drop]], [[HTML Web Storage]], [[HTML Web Workers]], [[HTML SSE]]
+- **참조 맥락:** The entry point that frames the entire HTML5 Web APIs section.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — HTML Web APIs — https://www.w3schools.com/html/html5_api_whatis.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "HTML Web APIs" page (Astra wiki-curation, P-Reinforce v3.1 format).