HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>reversed — JavaScript toggle</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}ol{margin:.5rem 0 1rem;padding-left:1.5rem}button{padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:none;background:#2563eb;color:#fff}#status{margin-top:.75rem;font-size:.875rem;color:#475569}</style>

</head>

<body>

  <h1>Toggle reversed</h1>

  <p>Click the button to switch marker direction:</p>



  <ol id=dynamicList>

    <li>Step three</li>

    <li>Step two</li>

    <li>Step one</li>

  </ol>



  <button type=button id=toggleBtn>Toggle reversed</button>

  <p id=status aria-live=polite>reversed: false (markers 1, 2, 3)</p>



  <script>const list=document.getElementById("dynamicList"),status=document.getElementById("status");function updateStatus(){status.textContent=list.reversed?"reversed: true (markers 3, 2, 1)":"reversed: false (markers 1, 2, 3)"}document.getElementById("toggleBtn").addEventListener("click",()=>{list.reversed=!list.reversed,updateStatus()})</script>

</body>

</html>

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HTML reversed Attribute — JavaScript toggle