HTML Code
<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>oncontextmenu — custom menu</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}#area{padding:2rem;border:2px dashed #cbd5e1;border-radius:8px;background:#fff;max-width:360px;cursor:context-menu;user-select:none}#menu{position:fixed;margin:0;padding:.35rem 0;list-style:none;background:#fff;border:1px solid #cbd5e1;border-radius:6px;box-shadow:0 4px 12px rgba(15,23,42,.12);min-width:140px;z-index:10}#menu[hidden]{display:none}#menu button{display:block;width:100%;text-align:left;padding:.45rem .75rem;border:none;background:0 0;font:inherit;cursor:pointer}#menu button:hover{background:#f1f5f9}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>

</head>

<body>

  <h1>Simple custom context menu</h1>

  <p>Right-click inside the dashed area.</p>

  <div id=area>Right-click here</div>

  <ul id=menu hidden role=menu>

    <li role=none><button type=button role=menuitem data-action=copy>Copy</button></li>

    <li role=none><button type=button role=menuitem data-action=edit>Edit</button></li>

    <li role=none><button type=button role=menuitem data-action=delete>Delete</button></li>

  </ul>

  <p class=hint id=hint>Left-click anywhere to close the menu.</p>



  <script>var area=document.getElementById("area"),menu=document.getElementById("menu"),hint=document.getElementById("hint");area.addEventListener("contextmenu",(function(e){e.preventDefault(),menu.style.left=e.clientX+"px",menu.style.top=e.clientY+"px",menu.hidden=!1})),menu.addEventListener("click",(function(e){e.target.dataset.action&&(hint.textContent="Action: "+e.target.dataset.action,menu.hidden=!0)})),document.addEventListener("click",(function(){menu.hidden=!0}))</script>

</body>

</html>
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HTML oncontextmenu Attribute — Custom Menu
