HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>custom context menu</title>
  <style>
    #surface { height: 180px; border: 1px solid #475569; background: #e2e8f0; }
    #menu {
      display: none;
      position: fixed;
      margin: 0;
      padding: 0.5rem 0;
      list-style: none;
      background: #fff;
      border: 1px solid #94a3b8;
      box-shadow: 0 4px 12px rgba(0,0,0,.12);
      min-width: 140px;
      z-index: 10;
    }
    #menu button {
      display: block;
      width: 100%;
      border: 0;
      background: transparent;
      text-align: left;
      padding: 0.4rem 0.75rem;
      cursor: pointer;
    }
  </style>
</head>
<body>
  <div id="surface">Right-click for a custom menu</div>
  <ul id="menu" role="menu">
    <li><button type="button">Copy</button></li>
    <li><button type="button">Paste</button></li>
    <li><button type="button">Delete</button></li>
  </ul>
  <script>
    var surface = document.getElementById("surface");
    var menu = document.getElementById("menu");
    surface.addEventListener("contextmenu", function (event) {
      event.preventDefault();
      menu.style.display = "block";
      menu.style.left = event.clientX + "px";
      menu.style.top = event.clientY + "px";
    });
    document.addEventListener("click", function () {
      menu.style.display = "none";
    });
  </script>
</body>
</html>

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Element contextmenu — custom menu (Try It)