CodePen Embed - vue style 3

<div id='app'>
  <div class="" v-bind:class="[classA, classB]">Hello</div>
</div>

.class-a{
  font-weight: bold;
}
.class-b{
  color: blue;
}

var vm = new Vue({
  el: '#app',
  data: {
      classA: 'class-a',
      classB: 'class-b'
  }
})

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