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title

W3CSS Sidebar

🎯 한 줄 통찰 (One-line insight)

"Open over content" and "slide content to the right" are NOT the same interaction despite looking similar — the former only toggles the sidebar's own display, while the latter additionally animates the MAIN content's margin-left, meaning a push-style sidebar requires coordinating two separate elements' styles in the same JS function, not just revealing the sidebar itself. [S1]

🧠 핵심 개념 (Core concepts)

w3-sidebar — the base class for a vertical, typically fixed-position side navigation panel. [S1]
Six distinct sidebar interaction patterns — always-visible, collapsible-responsive, overlay-over-part, overlay-over-all, slide-content-right, and right-side instead of left. [S1]
margin-left reservation — an always-visible sidebar requires the adjacent content div to have a matching margin-left (e.g. sidebar width:25% pairs with content margin-left:25%) so content doesn't render underneath it. [S1]
w3-collapse — combined with w3-hide-large, creates a sidebar that's always visible on large screens but hidden/toggle-controlled on small screens. [S1]
w3-overlay — adds a semi-transparent (50% opacity) black layer over page content while the sidebar is open, visually emphasizing the open sidebar without changing its position. [S1]
Right-side placement — simply swapping style="left:0" for style="right:0" (or omitting left and adding right:0) relocates the entire sidebar system to the opposite edge. [S1]

📖 세부 내용 (Details)

Always-visible sidebar with reserved content margin: <div class="w3-sidebar w3-bar-block" style="width:25%">...</div><div style="margin-left:25%">... page content ...</div>. [S1]
Slide-content-right (distinct from simple overlay): function w3_open() { document.getElementById("main").style.marginLeft = "25%"; document.getElementById("mySidebar").style.width = "25%"; document.getElementById("mySidebar").style.display = "block"; } — moves BOTH the sidebar and the main content. [S1]
Overlay effect: <div class="w3-overlay" onclick="w3_close()" style="cursor:pointer" id="myOverlay"></div> shown/hidden alongside the sidebar via the same open/close functions. [S1]
Collapsible responsive sidebar: <div class="w3-sidebar w3-bar-block w3-collapse w3-card" style="width:200px;" id="mySidebar"><button class="w3-bar-item w3-button w3-hide-large" onclick="w3_close()">Close ×</button>...</div> paired with a w3-main content div using matching margin-left. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

오버레이 vs 콘텐츠 밀기의 차이: 단순 오버레이는 사이드바의 display만 바꾸지만, "슬라이드" 방식은 사이드바뿐 아니라 메인 콘텐츠의 marginLeft까지 함께 변경해야 한다는 구현 차이가 있음. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — w3-overlay로 사이드바 오픈 시 배경을 어둡게 처리해 시선을 집중시키는 패턴이 모바일 메뉴 UX의 대표 실전 기법이다. [S1]

💻 코드 패턴 (Code patterns)

Sidebar with a semi-transparent overlay over the page content (HTML/JS):

<div class="w3-sidebar w3-bar-block" style="display:none;z-index:5" id="mySidebar">
  <button class="w3-bar-item w3-button" onclick="w3_close()">Close</button>
  <a href="#" class="w3-bar-item w3-button">Link 1</a>
</div>
<div class="w3-overlay" onclick="w3_close()" style="cursor:pointer" id="myOverlay"></div>
<script>
function w3_open() {
  document.getElementById("mySidebar").style.display = "block";
  document.getElementById("myOverlay").style.display = "block";
}
function w3_close() {
  document.getElementById("mySidebar").style.display = "none";
  document.getElementById("myOverlay").style.display = "none";
}
</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 Navigation, W3CSS Accordions, W3CSS Dropdowns, W3CSS Tabulators
참조 맥락: Navigation Components 섹션 마지막 — UI Components 섹션의 탭(Tabulators) 챕터로 이어짐.

📚 출처 (Sources)

[S1] W3Schools — W3.CSS Sidebar — https://www.w3schools.com/w3css/w3css_sidebar.asp

📝 변경 이력 (Change history)

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

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