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-links
+title: "HTML Links"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["HTML hyperlinks", "a tag", "href attribute", "target attribute", "mailto link", "HTML anchor"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.89
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["html", "web", "frontend", "w3schools", "links", "hyperlinks"]
+raw_sources: ["https://www.w3schools.com/html/html_links.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[HTML Links]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The HTML `<a>` tag defines a hyperlink, using the `href` attribute for the destination and the `target` attribute to control where the linked document opens. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **The `<a>` tag** — defines a hyperlink; syntax is `<a href="url">link text</a>`, where `href` indicates the destination. [S1]
+- **The `target` attribute** — controls where the link opens; values are `_self` (default, same window), `_blank` (new tab/window), `_parent` (parent frame), and `_top` (full window). [S1]
+- **Absolute vs relative URLs** — absolute URLs are full web addresses; a relative URL links to a page within the same website. [S1]
+- **Image as a link** — put an `<img>` tag inside the `<a>` tag. [S1]
+- **Email link** — use `mailto:` inside `href` to open the user's email program. [S1]
+- **Button as a link** — requires JavaScript (an `onclick` handler that sets `document.location`). [S1]
+- **The `title` attribute** — specifies extra information, most often shown as a tooltip on hover. [S1]
+- **Link color states** — an unvisited link is underlined and blue, a visited link is underlined and purple, an active link is underlined and red. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Basic link pattern** — `<a href="url">link text</a>`. [S1]
+- **New-tab pattern** — `<a href="url" target="_blank">…</a>`. [S1]
+- **Image-link pattern** — nest `<img>` inside `<a>`. [S1]
+- **Email pattern** — `<a href="mailto:address">…</a>`. [S1]
+- **Button-link pattern** — `<button onclick="document.location='url'">…</button>`. [S1]
+- **Tooltip pattern** — add a `title` attribute to the `<a>` tag. [S1]
+
+## 📖 세부 내용 (Details)
+**Link syntax** — the HTML `<a>` tag defines a hyperlink; it has the following syntax: [S1]
+```html
+<a href="url">link text</a>
+```
+
+**Basic link** — a link to W3Schools.com: [S1]
+```html
+<a href="https://www.w3schools.com/">Visit W3Schools.com!</a>
+```
+
+**The `target` attribute** — use `target="_blank"` to open the linked document in a new browser window or tab. Target values are `_self` (default), `_blank`, `_parent`, and `_top`. [S1]
+```html
+<a href="https://www.w3schools.com/" target="_blank">Visit W3Schools!</a>
+```
+
+**Absolute vs relative URLs** — a local link (a link to a page within the same website) is specified with a relative URL: [S1]
+```html
+<h2>Absolute URLs</h2>
+<p><a href="https://www.w3.org/">W3C</a></p>
+<p><a href="https://www.google.com/">Google</a></p>
+
+<h2>Relative URLs</h2>
+<p><a href="html_images.asp">HTML Images</a></p>
+<p><a href="/css/default.asp">CSS Tutorial</a></p>
+```
+
+**Image as a link** — to use an image as a link, just put the `<img>` tag inside the `<a>` tag: [S1]
+```html
+<a href="default.asp">
+<img src="smiley.gif" alt="HTML tutorial" style="width:42px;height:42px;">
+</a>
+```
+
+**Email link** — use `mailto:` inside the `href` attribute to create a link that opens the user's email program: [S1]
+```html
+<a href="mailto:someone@example.com">Send email</a>
+```
+
+**Button as a link** — to use an HTML button as a link, you have to add some JavaScript code: [S1]
+```html
+<button onclick="document.location='default.asp'">HTML Tutorial</button>
+```
+
+**Link title attribute** — the `title` attribute specifies extra information about an element; the information is most often shown as a tooltip text: [S1]
+```html
+<a href="https://www.w3schools.com/html/" title="Go to W3Schools HTML section">Visit our HTML Tutorial</a>
+```
+
+**Link color states** — by default: an unvisited link is underlined and blue; a visited link is underlined and purple; an active link is underlined and red. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+The W3Schools basic link, the new-tab link, the image link, the mailto link, and the button link above are the canonical applied examples from the source. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Basic hyperlink (HTML):
+```html
+<a href="https://www.w3schools.com/">Visit W3Schools.com!</a>
+```
+Open in a new tab:
+```html
+<a href="https://www.w3schools.com/" target="_blank">Visit W3Schools!</a>
+```
+Image as a link:
+```html
+<a href="default.asp">
+<img src="smiley.gif" alt="HTML tutorial" style="width:42px;height:42px;">
+</a>
+```
+Email link:
+```html
+<a href="mailto:someone@example.com">Send email</a>
+```
+Button as a link:
+```html
+<button onclick="document.location='default.asp'">HTML Tutorial</button>
+```
+
+## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
+The source distinguishes the four `target` values and absolute vs relative URLs: [S1]
+
+| Choice | Meaning |
+|---|---|
+| `target="_self"` | Open in the same window (default) |
+| `target="_blank"` | Open in a new window or tab |
+| `target="_parent"` | Open in the parent frame |
+| `target="_top"` | Open in the full body of the window |
+| Absolute URL | Full web address (e.g. `https://www.w3.org/`) |
+| Relative URL | Page within the same website (e.g. `html_images.asp`) |
+
+## ⚖️ 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:** 0.89
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[HTML Tutorial]]
+- **관련 개념:** [[HTML Images]], [[HTML Attributes]], [[HTML Page Title]], [[HTML Introduction]]
+- **참조 맥락:** Referenced whenever creating navigation, hyperlinks, email links, image links, or button-based navigation.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — HTML Links — https://www.w3schools.com/html/html_links.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "HTML Links" page (Astra wiki-curation, P-Reinforce v3.1 format).