HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onmouseover — tooltip</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}#wrap{position:relative;display:inline-block}#trigger{padding:.5rem 1rem;background:#6366f1;color:#fff;border-radius:6px;cursor:help;font-size:.875rem;font-weight:600}#tooltip{position:absolute;left:0;top:100%;margin-top:.5rem;padding:.5rem .75rem;background:#1e293b;color:#f8fafc;border-radius:6px;font-size:.8125rem;white-space:nowrap}#tooltip[hidden]{display:none}#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>Tooltip on mouseover</h1>

  <p>Hover the purple label to show the tip.</p>

  <div id=wrap>

    <span id=trigger>Hover for info</span>

    <div id=tooltip hidden>Helpful details appear here</div>

  </div>

  <p id=status>Tooltip: hidden</p>



  <script>var trigger=document.getElementById("trigger"),tooltip=document.getElementById("tooltip"),status=document.getElementById("status");trigger.addEventListener("mouseover",(function(){tooltip.hidden=!1,status.textContent="Tooltip: visible"})),trigger.addEventListener("mouseout",(function(){tooltip.hidden=!0,status.textContent="Tooltip: hidden"}))</script>

</body>

</html>

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HTML onmouseover Attribute — Show tooltip