text: export default {
      template: `<!-- id="playground-result" is required for reuse self -->
  <div id="playground-result">
    <button id="hello" @click="sayHelloWorld">Click Me</button>
  </div>`,
      script: `return {
    methods: {
      sayHelloWorld(){
        window.alert('Hello World!')
      }
    }
  }`,
      css: `#hello {
    background-color: #2196f3;
    color: white;
    width: 200px;
    height: 40px;
  }`
  }