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: css-custom-fonts
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title: "CSS Custom Fonts"
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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: ["@font-face", "web fonts", "CSS custom fonts", "font-face rule", "WOFF fonts"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.87
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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: ["css", "web", "frontend", "w3schools", "fonts", "font-face", "typography"]
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raw_sources: ["https://www.w3schools.com/css/css3_fonts.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Custom Fonts]]
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## 🎯 한 줄 통찰 (One-line insight)
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The CSS `@font-face` rule lets you define and load custom (web) fonts so a page can use a typeface without it being installed on the visitor's computer — the font file downloads automatically when needed. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`@font-face` defines and loads custom fonts** — it allows you to define and load custom fonts for use on a webpage. [S1]
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- **No local installation required** — the font does not need to be installed on the user's computer; it downloads automatically when needed. [S1]
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- **Two required descriptors** — `font-family` (the font name you choose) and `src` (the URL of the font file). [S1]
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- **Weight variants need their own rule** — to support bold, define an additional `@font-face` rule with `font-weight: bold;` pointing at the bold font file. [S1]
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- **Web-optimized formats exist** — WOFF and WOFF2 (Web Open Font Format) are optimized for web use and broadly supported; TTF/OTF are popular for desktop but are not web-optimized. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Define-then-use pattern** — declare a font with `@font-face { font-family; src; }`, then reference that name in a selector's `font-family`. [S1]
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- **Weight-variant pattern** — add a second `@font-face` with `font-weight: bold;` and a bold font file. [S1]
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## 📖 세부 내용 (Details)
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**The CSS `@font-face` Rule** [S1]
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The CSS `@font-face` rule allows you to define and load custom fonts for use on a webpage. The font does not need to be installed on the user's computer; it downloads automatically when needed.
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**Basic custom font example** [S1]
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In the `@font-face` rule, first define a name for the font (e.g. `myFont`) and then point to the font file. To use the font for an HTML element, refer to the font name through the `font-family` property:
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```css
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@font-face {
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font-family: myFont;
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src: url(sansation_light.woff);
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}
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p {
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font-family: myFont;
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}
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```
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**Using bold text with `@font-face`** [S1]
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You must add another `@font-face` rule containing descriptors for bold text. The `src` property points to a different (bold) font file, and `font-weight: bold;` ties it to bold usage:
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```css
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@font-face {
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font-family: myFont;
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src: url(sansation_bold.woff);
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font-weight: bold;
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}
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```
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This way the browser uses the specific bold font file whenever bold text of `myFont` is requested.
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**Font formats** [S1]
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- **WOFF / WOFF2 (Web Open Font Format)** — optimize file size for web use, developed in 2009, have W3C Recommendation status, and are supported across all major browsers.
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- **TTF (TrueType Fonts)** — emerged in the late 1980s via Apple; popular for desktop use but not web-optimized.
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- **OTF (OpenType Fonts)** — developed by Apple and Microsoft as an advanced, scalable format; popular for desktop use but not web-optimized.
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**CSS `@font-face` Descriptors table** [S1]
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| Descriptor | Description |
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|---|---|
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| `font-family` | Required; defines the font name |
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| `src` | Required; defines the URL of the font file |
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| `font-stretch` | Optional; default `normal` |
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| `font-style` | Optional; default `normal` |
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| `font-weight` | Optional; default `normal` |
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| `font-display` | Optional; default `auto` |
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| `unicode-range` | Optional; default `U+0-10FFFF` |
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## 🛠️ 적용 사례 (Applied in summary)
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The page's own demonstrations (defining `myFont` via `@font-face` and applying it to `p`, plus the bold variant) serve as the applied examples. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Define and use a custom font (language: CSS):
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```css
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@font-face {
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font-family: myFont;
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src: url(sansation_light.woff);
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}
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p {
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font-family: myFont;
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}
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```
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Add a bold variant:
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```css
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@font-face {
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font-family: myFont;
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src: url(sansation_bold.woff);
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font-weight: bold;
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}
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```
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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- **WOFF/WOFF2 vs TTF/OTF** — WOFF and WOFF2 are optimized for the web (smaller files, W3C Recommendation, broad browser support); TTF and OTF are popular for desktop use but are not web-optimized. Prefer WOFF/WOFF2 for the `src` of web fonts. [S1]
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- **Regular vs bold** — a single `@font-face` covers the regular weight; declare a separate `@font-face` with `font-weight: bold;` to load a dedicated bold file. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source.
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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:** 0.87
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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:** [[CSS Tutorial]]
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- **관련 개념:** [[CSS Text Effects]], [[CSS Text Shadow Effects]], [[CSS Box Shadow]]
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- **참조 맥락:** Referenced when loading a brand or non-system typeface so it renders consistently regardless of the visitor's installed fonts.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Custom Fonts — https://www.w3schools.com/css/css3_fonts.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Custom Fonts" page (Astra wiki-curation, P-Reinforce v3.1 format).
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