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: javascript-dom-animations
+title: "JavaScript DOM Animations"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["DOM animation", "JavaScript animation", "setInterval animation", "animate element", "frame animation"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["javascript", "js", "web", "frontend", "w3schools", "dom"]
+raw_sources: ["https://www.w3schools.com/js/js_htmldom_animate.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[JavaScript DOM Animations]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+JavaScript animations work by programming gradual changes to an element's style, driven by a timer — with a small interval, the motion looks continuous. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Animation = timed style changes** — JavaScript animations are done by programming gradual changes in an element's style; the changes are called by a timer, and a small interval makes the animation look continuous. [S1]
+- **Relative container, absolute element** — the container element should be created with `style = 'position: relative'`, and the animation element with `style = 'position: absolute'`. [S1]
+- **setInterval / clearInterval drive frames** — a repeating timer calls a `frame()` function until a finish condition is met, then clears the interval. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Timer loop** — `id = setInterval(frame, 5)` repeatedly calls `frame()`, which either ends (`clearInterval(id)`) or applies the next incremental style change. [S1]
+- **Increment position** — bump a `pos` counter each frame and write it to `style.top` / `style.left` as pixel values. [S1]
+- **Reset before start** — call `clearInterval(id)` before starting a new interval to avoid stacking timers. [S1]
+
+## 📖 세부 내용 (Details)
+**A Basic Web Page** [S1]
+Start from a simple page with a placeholder element: [S1]
+```html
+<!DOCTYPE html>
+<html>
+<body>
+  <h1>My First JavaScript Animation</h1>
+  <div id="animation">My animation will go here</div>
+</body>
+</html>
+```
+
+**Create an Animation Container** [S1]
+Wrap the animated element in a container: [S1]
+```html
+<div id="container">
+  <div id="animate">My animation will go here</div>
+</div>
+```
+
+**Style the Elements** [S1]
+The container is positioned `relative` and the animated element `absolute`: [S1]
+```css
+#container {
+  width: 400px;
+  height: 400px;
+  position: relative;
+  background: yellow;
+}
+#animate {
+  width: 50px;
+  height: 50px;
+  position: absolute;
+  background: red;
+}
+```
+
+**Animation Code** [S1]
+The general timer-driven pattern: [S1]
+```javascript
+id = setInterval(frame, 5);
+
+function frame() {
+  if (/* test for finished */) {
+    clearInterval(id);
+  } else {
+    /* code to change the element style */
+  }
+}
+```
+
+**Create the Full Animation Using JavaScript** [S1]
+The complete animation moves the element diagonally until `pos == 350`: [S1]
+```javascript
+function myMove() {
+  let id = null;
+  const elem = document.getElementById("animate");
+  let pos = 0;
+  clearInterval(id);
+  id = setInterval(frame, 5);
+  function frame() {
+    if (pos == 350) {
+      clearInterval(id);
+    } else {
+      pos++;
+      elem.style.top = pos + 'px';
+      elem.style.left = pos + 'px';
+    }
+  }
+}
+```
+
+## 🛠️ 적용 사례 (Applied in summary)
+The page's `myMove()` function — moving `#animate` diagonally inside `#container` via `setInterval` — is the canonical applied example. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Full timer-driven animation (language: JavaScript):
+```javascript
+function myMove() {
+  let id = null;
+  const elem = document.getElementById("animate");
+  let pos = 0;
+  clearInterval(id);
+  id = setInterval(frame, 5);
+  function frame() {
+    if (pos == 350) {
+      clearInterval(id);
+    } else {
+      pos++;
+      elem.style.top = pos + 'px';
+      elem.style.left = pos + 'px';
+    }
+  }
+}
+```
+
+## ⚖️ 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:** 0.88
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[JavaScript Tutorial]]
+- **관련 개념:** [[JavaScript DOM Changing CSS]], [[JavaScript HTML DOM]], [[JavaScript HTML Events]], [[JavaScript DOM Methods]]
+- **참조 맥락:** Builds on style manipulation; uses timers to apply incremental style changes over time.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — JavaScript DOM Animations — https://www.w3schools.com/js/js_htmldom_animate.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript DOM Animations" page (Astra wiki-curation, P-Reinforce v3.1 format).