JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.0.3/vue.js"></script>
<div id="app">
  <span v-html="message"></span>
  <button v-on:click="newHtml">
Change HTML
  </button>
</div>
 
<div id="app1">
  <span v-html="message">{{getAppMessage}}</span>
</div>

JavaScript

var app =  new Vue({
     el: "#app",
     methods: {
     	 newHtml() {
         this.message = '<p style="color:red;">New Message</p>';
       }
     },
     data: {
       message: "<p>Message</p>"
     }
   });
   
   var app1 =  new Vue({
     el: "#app1",
 
     data: {
       message: app.message
     },
     
     computed: {
         getAppMessage: function (val) {
      		this.message = app.message
    		}
     } 
   });