docs(10_Wiki): 위키 구조 정리 — 언어 튜토리얼 카테고리 폴더 제거 + 신규 자산 동기화
Topic_CSS/Topic_HTML/Topic_JavaScript/Topic_Prompt/Topic_Comfyui 등 기존 카테고리 폴더를 정리하고, Topic_Graphic/Dev 등 신규 산출물과 Topics 내부 세션/메모리 기록을 동기화.
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Antigravity Agent
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id: css-interactive-pseudo-classes
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title: "CSS Interactive Pseudo-classes"
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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: ["interactive pseudo-classes", "link pseudo-classes", "hover focus active", "anchor states", "hover tooltip"]
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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", "pseudo-classes", "links"]
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raw_sources: ["https://www.w3schools.com/css/css_pseudo_classes_interactive.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Interactive Pseudo-classes]]
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## 🎯 한 줄 통찰 (One-line insight)
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Interactive pseudo-classes style elements in response to user actions — the four link states (`:link`, `:visited`, `:hover`, `:active`) must be declared in a specific order, and `:hover`/`:focus` also power effects like tooltips and highlighted inputs. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Four link states** — `:link` (unvisited), `:visited` (visited), `:hover` (mouseover), `:active` (when clicked/activated). [S1]
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- **Order matters** — `a:hover` MUST come after `a:link` and `a:visited` to be effective; `a:active` MUST come after `a:hover` to be effective. [S1]
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- **`:hover` is not just for links** — it can apply to any element, e.g. a `<div>`. [S1]
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- **`:focus`** — styles a form input while it has focus. [S1]
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- **Hover-driven reveal** — `div:hover p` can show a hidden paragraph, producing a simple tooltip effect. [S1]
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- **Combine with classes** — pseudo-classes can be combined with HTML classes, e.g. `a.highlight:hover`. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **LVHA ordering** — declare link, visited, hover, active in that cascade order so each rule takes effect. [S1]
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- **Hover-to-reveal** — hide a child (`display: none`) and show it (`display: block`) on parent hover for a tooltip. [S1]
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- **Scoped hover** — pair a class with `:hover` (`a.highlight:hover`) to limit the effect to selected elements. [S1]
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## 📖 세부 내용 (Details)
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**Link pseudo-classes (the four states)**
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Style links through different states using `:link`, `:visited`, `:hover`, and `:active`: [S1]
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```css
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/* unvisited link */
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a:link {
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color: #FF0000;
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}
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/* visited link */
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a:visited {
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color: #00FF00;
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}
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/* mouse over link */
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a:hover {
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color: #FF00FF;
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}
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/* selected link */
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a:active {
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color: #0000FF;
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}
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```
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**Ordering note**
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`a:hover` MUST come after `a:link` and `a:visited` in the CSS definition in order to be effective! `a:active` MUST come after `a:hover` in the CSS definition in order to be effective! [S1]
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**`:hover` on a `div` element** [S1]
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```css
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div:hover {
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background-color: blue;
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}
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```
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**Simple tooltip hover effect**
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Hovering over a `<div>` reveals a hidden paragraph: [S1]
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```css
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p {
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display: none;
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background-color: yellow;
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padding: 20px;
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}
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div:hover p {
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display: block;
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}
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```
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**`:focus` on an `input` element** [S1]
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```css
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input:focus {
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background-color: yellow;
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}
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```
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**Combining pseudo-classes with HTML classes** [S1]
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```css
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a.highlight:hover {
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color: #ff0000;
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}
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```
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## 🛠️ 적용 사례 (Applied in summary)
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The page's own applied examples are: coloring the four anchor link states, changing a `div` background on hover, a hover-reveal tooltip (`div:hover p`), highlighting a focused input, and a class-scoped hover (`a.highlight:hover`). No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Hover-to-reveal tooltip (language: CSS):
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```css
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p {
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display: none;
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}
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div:hover p {
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display: block;
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}
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```
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Class-scoped hover:
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```css
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a.highlight:hover {
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color: #ff0000;
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}
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```
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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- **`:hover` vs `:active` vs `:focus`** — `:hover` reacts to the mouse being over an element, `:active` to the element being activated (e.g. clicked), and `:focus` to an element (typically a form field) holding focus. For links, all four states must follow the LVHA order to apply correctly. [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:** 0.88
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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 Pseudo-classes]], [[CSS Combinators]], [[CSS Links]], [[CSS Selectors]]
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- **참조 맥락:** Referenced when styling link states, hover/focus interactions, and hover-driven UI such as tooltips.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Interactive Pseudo-classes — https://www.w3schools.com/css/css_pseudo_classes_interactive.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Interactive Pseudo-classes" page (Astra wiki-curation, P-Reinforce v3.1 format).
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