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-comments
+title: "HTML Comments"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["HTML comment syntax", "comment tag", "comment out HTML", "hide HTML content", "HTML annotations"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.90
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["html", "web", "frontend", "w3schools", "comments", "debugging"]
+raw_sources: ["https://www.w3schools.com/html/html_comments.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[HTML Comments]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+HTML comments are written between `<!--` and `-->`, are not displayed in the browser, and help document source code, hide content temporarily, and debug pages. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Comments are invisible** — HTML comments are not displayed in the browser, but they can help document your HTML source code. [S1]
+- **Comment syntax** — written as `<!-- Write your comments here -->`. The exclamation point (`!`) appears in the opening tag but not the closing tag. [S1]
+- **Documentation use** — comments can hold notes and reminders for the author. [S1]
+- **Hiding content** — comments can temporarily conceal content (a block, multiple lines, or a mid-line/inline section). [S1]
+- **Debugging aid** — comment out HTML lines individually to locate errors. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Note/reminder pattern** — drop `<!-- reminder -->` markers near relevant markup. [S1]
+- **Block-hide pattern** — wrap one or many lines in `<!-- … -->` to remove them from rendering without deleting them. [S1]
+- **Inline-hide pattern** — `<!-- … -->` placed mid-line hides just that fragment. [S1]
+- **Debug-by-elimination pattern** — comment out lines one at a time to isolate the source of an error. [S1]
+
+## 📖 세부 내용 (Details)
+HTML comments are not displayed in the browser, but they can help document your HTML source code. [S1]
+
+**Comment syntax**
+The basic syntax for an HTML comment is the text written between `<!--` and `-->`. Note that the exclamation point (`!`) appears in the opening tag but not the closing tag. [S1]
+```html
+<!-- Write your comments here -->
+```
+
+**Adding comments**
+Comments can include notifications and reminders. [S1]
+```html
+<!-- This is a comment -->
+
+<p>This is a paragraph.</p>
+
+<!-- Remember to add more information here -->
+```
+
+**Hiding content**
+Comments can conceal content temporarily. [S1]
+```html
+<p>This is a paragraph.</p>
+
+<!-- <p>This is another paragraph </p> -->
+
+<p>This is a paragraph too.</p>
+```
+
+Multiple lines can be hidden between the opening and closing comment delimiters. Comments are useful for debugging — comment out HTML lines individually to locate errors. [S1]
+```html
+<p>This is a paragraph.</p>
+<!--
+<p>Look at this cool image:</p>
+<img border="0" src="pic_trulli.jpg" alt="Trulli">
+-->
+<p>This is a paragraph too.</p>
+```
+
+**Hiding inline content**
+Comments can obscure mid-code (inline) sections. [S1]
+```html
+<p>This <!-- great text --> is a paragraph.</p>
+```
+
+## 🛠️ 적용 사례 (Applied in summary)
+The reminder note, the block-hidden paragraph/image, and the inline-hidden fragment above are the canonical applied examples from the source. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Basic comment (HTML):
+```html
+<!-- Write your comments here -->
+```
+Comment out a block of markup:
+```html
+<!--
+<p>Look at this cool image:</p>
+<img border="0" src="pic_trulli.jpg" alt="Trulli">
+-->
+```
+Hide an inline fragment:
+```html
+<p>This <!-- great text --> is a paragraph.</p>
+```
+
+## ⚖️ 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:** 0.90
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[HTML Tutorial]]
+- **관련 개념:** [[HTML Introduction]], [[HTML Elements]], [[HTML Attributes]], [[HTML Quotations]]
+- **참조 맥락:** Referenced when documenting markup, hiding content during development, or debugging by elimination.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — HTML Comments — https://www.w3schools.com/html/html_comments.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "HTML Comments" page (Astra wiki-curation, P-Reinforce v3.1 format).