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title

W3CSS Progress Bar

🎯 한 줄 통찰 (One-line insight)

A W3.CSS progress bar is nothing but a plain <div> nested inside another <div>, with the inner div's inline CSS width percentage doing 100% of the "progress" representation — meaning a dynamic/animated progress bar is just setInterval incrementing that one CSS property over time, with zero framework-specific progress API. [S1]

🧠 핵심 개념 (Core concepts)

Two-div structure — outer div (w3-light-grey, the track) contains an inner div (any w3-color, the fill) whose width percentage IS the progress value. [S1]
Labels — placing text directly inside the inner (colored) div, with w3-container for padding and w3-center for alignment, turns the fill into a labeled progress bar. [S1]
Dynamic progress via setInterval — setInterval(frame, 10) repeatedly increments a width variable and applies it to the inner div's style until it reaches 100%, then clearInterval stops the loop. [S1]
Composable styling — w3-round for rounded corners, w3-padding for internal spacing, w3-size classes for label text size — all standard utility classes apply directly to the progress divs. [S1]

📖 세부 내용 (Details)

Basic static progress bar: <div class="w3-border"><div class="w3-grey" style="height:24px;width:20%"></div></div>. [S1]
Labeled, centered progress bar: <div class="w3-light-grey"><div class="w3-container w3-green w3-center" style="width:25%">25%</div></div>. [S1]
Dynamic JS-driven progress bar: function move() { var elem = document.getElementById("myBar"); var width = 1; var id = setInterval(frame, 10); function frame() { if (width >= 100) { clearInterval(id); } else { width++; elem.style.width = width + '%'; } } }. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

현재까지 발견된 모순 사항 없음 (No contradictions found in available sources).

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — setInterval로 width 값을 1%씩 증가시키며 애니메이션 진행 바를 만드는 패턴이 파일 업로드 진행률 표시 등 실전 활용의 대표 기법이다. [S1]

💻 코드 패턴 (Code patterns)

A dynamic progress bar driven purely by incrementing a div's width via setInterval (HTML/JS):

<div class="w3-light-grey">
  <div id="myBar" class="w3-container w3-green" style="height:24px;width:1%"></div>
</div>
<button class="w3-button w3-light-grey" onclick="move()">Click Me</button>
<script>
function move() {
  var elem = document.getElementById("myBar");
  var width = 1;
  var id = setInterval(frame, 10);
  function frame() {
    if (width >= 100) {
      clearInterval(id);
    } else {
      width++;
      elem.style.width = width + '%';
    }
  }
}
</script>

✅ 검증 상태 및 신뢰도

상태: draft
검증 단계: conceptual
출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
신뢰 점수: 0.87
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: W3.CSS Tutorial
관련 개념: W3CSS Pagination, W3CSS Slideshow
참조 맥락: setInterval 기반 동적 UI 패턴 — 슬라이드쇼(Slideshow) 챕터에서 동일 타이머 패턴이 재등장.

📚 출처 (Sources)

[S1] W3Schools — W3.CSS Progress Bars — https://www.w3schools.com/w3css/w3css_progressbar.asp

📝 변경 이력 (Change history)

2026-07-04: Initial draft synthesized from the W3Schools "W3.CSS Progress Bars" page (Astra wiki-curation, P-Reinforce v3.1 format).

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