W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<head>
  <title>Mouse Pointer Position Change</title>
  <style>
    #app {
      border: dashed black 1px;
      display: inline-block;
      padding: 10px;
    }
    #app > div {
      width: 200px;
      height: 50px;
      border: solid black 1px;
      background-color: lightgreen;
    }
    #app > p {
      font-size: large;
      font-weight: bold;
      text-align: center;
    }
  </style>
</head>
<body>

<h1>Example: Mouse Pointer Position Change</h1>
<p>To see the difference in mouse pointer position from one click event to the next we can subtract the old x-position from the new x-position.</p>
<div id="app">
  <div v-on:click="updatePos"></div>
  <p><code>{{ xDiff }}</code></p> 
</div>

</body>
</html>