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new Vue({
  el: '#app',
  data() {
    return {
      selected: null,
      isVisible: true,
      options: [
        { value: null, text: 'Please select an option' },
        { value: 'a', text: 'This is First option' },
        { value: 'b', text: 'Selected Option' },
        { value: { C: '3PO' }, text: 'This is an option with object value' },
        { value: 'd', text: 'This one is disabled', disabled: true }
      ]
    }
  },
  methods: {
    onOver() {
      this.isVisible = true;
    },
    onLeave() {
      this.isVisible = false;
    }
  }
})

.wrapper-div {
  height: 20px;
}

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[email?protected]/dist/bootstrap-vue.css"/>