SOURCE

var app2 = new Vue({
  el: '#app-2',
  data: {
    message: 'You loaded this page on ' + new Date()
  }
})

<script src="https://unpkg.com/vue/dist/vue.js"></script>
<div id="app-2">
  <span v-bind:title="message">
  	Hover your mouse over me for a few seconds to see my dynamically bound title!  
  </span>
</div>