---
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).
