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<!DOCTYPE html>
<html>
<head>
  <title>Mouse Pointer Position</title>
  <style>
    #app {
      border: black dashed 1px;
      width: 200px;
      padding: 0 20px 20px 20px;
    }
  </style>
</head>
<body>
<h1>Example: Create Alert Only Once</h1>
<div id="app">
  <p>The button below creates an alert in a pop-up box, but only on the first click:</p>
  <button v-on:click.once="createAlert">Create Alert</button>
</div>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
<script>
  const app = Vue.createApp({
    methods: {
      createAlert() {
        alert("Alert created from button click")
      }
    }
  })
 app.mount('#app')
</script>
</body>
</html>