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-accessibility
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title: "CSS Accessibility"
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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: ["CSS a11y", "accessible CSS", "focus styles", "color contrast", "prefers-reduced-motion"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.88
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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", "accessibility", "a11y", "focus"]
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raw_sources: ["https://www.w3schools.com/css/css_accessibility.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Accessibility]]
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## 🎯 한 줄 통찰 (One-line insight)
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Accessible CSS rests on a few habits: high color contrast, readable fonts, visible focus indicators, semantic HTML, and respecting user preferences such as reduced motion. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **High color contrast** — ensure foreground text stands out strongly against the background. [S1]
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- **Readable typography** — use legible font families, adequate font sizes, and generous line height. [S1]
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- **Visible focus indicators** — interactive elements must have a clear visual focus style. [S1]
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- **Don't hide focus** — never remove the focus outline without providing a visible replacement. [S1]
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- **Semantic HTML** — style semantic elements (`<nav>`, `<aside>`) rather than generic `<div>`s. [S1]
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- **Respect user preferences** — honor settings like reduced motion. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Focus-ring pattern** — apply a visible `outline` on `:focus` for links, buttons, and inputs. [S1]
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- **Reduced-motion pattern** — wrap a global animation/transition kill-switch in a `prefers-reduced-motion: reduce` media query. [S1]
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## 📖 세부 내용 (Details)
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**High color contrast.** Use a strong contrast between text and background. The good example uses an `#ffffff` background with `#000000` text; the bad example uses an `#eeeeee` background with `#cccccc` text (too low contrast). [S1]
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**Font, size, and line height.** Choose readable typography. The good example uses Arial/sans-serif at `1rem` with `1.6` line-height; the bad example uses Georgia/serif at `12px`, italic, small-caps variant, with `90%` line-height. [S1]
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**Visible focus indicators.** Always use the `:focus` pseudo-class to ensure that interactive elements (like links, buttons, input fields) have a clear visual focus style. [S1]
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```css
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a:focus, button:focus, input:focus {
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outline: 2px solid orange;
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}
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```
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**Avoid hiding focus.** Never use `outline: none` without replacement styling. Use a visible alternative such as `outline: 2px solid orange`. [S1]
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**Semantic HTML with CSS.** Style `<nav>` and `<aside>` elements (for example with backgrounds) instead of generic `<div>` tags, so the document remains meaningful to assistive technology. [S1]
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**Respect user preferences (reduced motion).** Honor a user's reduced-motion preference by disabling animations and transitions inside a media query. [S1]
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```css
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@media (prefers-reduced-motion: reduce) {
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* {
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animation: none !important;
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transition: none !important;
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}
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}
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```
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(Note: the exact color/font example code boxes for the contrast and typography sections were described but not captured verbatim from the source. — Not found in source.)
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## 🛠️ 적용 사례 (Applied in summary)
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The page's applied demonstrations contrast accessible vs inaccessible choices (white-on-black vs grey-on-light-grey; Arial 1rem/1.6 vs Georgia 12px italic), add a visible orange focus outline to links/buttons/inputs, and disable motion for users who request reduced motion. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Visible focus ring (language: CSS):
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```css
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a:focus, button:focus, input:focus {
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outline: 2px solid orange;
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}
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```
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Respect reduced-motion preference (language: CSS):
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```css
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@media (prefers-reduced-motion: reduce) {
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* {
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animation: none !important;
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transition: none !important;
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}
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}
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```
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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:** 0.88
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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 !important]], [[CSS Optimization]], [[CSS Website Layout]]
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- **참조 맥락:** Consulted when making a page usable for keyboard users, low-vision users, and people sensitive to motion.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Accessibility — https://www.w3schools.com/css/css_accessibility.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Accessibility" page (Astra wiki-curation, P-Reinforce v3.1 format).
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