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koriweb 9609c04755 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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title

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]

<!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]

<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]

#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]

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]

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):

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).

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