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<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onmouseup — press state</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}#box{display:inline-block;padding:1rem 1.5rem;border:2px solid #6366f1;border-radius:8px;background:#eef2ff;color:#3730a3;font-weight:600;cursor:pointer;user-select:none}#box.pressed{background:#6366f1;color:#fff;transform:scale(.98)}#status{margin-top:1rem;padding:.75rem 1rem;background:#fef3c7;border:1px solid #fde68a;border-radius:8px;font-size:.875rem;max-width:420px}</style>

</head>

<body>

  <h1>mousedown → mouseup</h1>

  <p>Press adds .pressed; release removes it.</p>

  <div id=box>Press and release me</div>

  <p id=status>State: idle</p>



  <script>var box=document.getElementById("box"),status=document.getElementById("status");box.addEventListener("mousedown",(function(){box.classList.add("pressed"),box.textContent="Pressed…",status.textContent="State: mousedown"})),box.addEventListener("mouseup",(function(){box.classList.remove("pressed"),box.textContent="Press and release me",status.textContent="State: mouseup — released"}))</script>

</body>

</html>

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HTML onmouseup Attribute — Press state