'How to append template in polymer 3

Trying to append template in the html, but not working, this is a simple concept but not working i am new in polymer 3. So, How to get solution for that.

  constructor() {
    super();
    const template = document.createElement('template');
    template.innerHTML = 'Hello World';
    this.shadowRoot = this.attachShadow({ mode: 'open' });
    this.shadowRoot.appendChild(template.content.cloneNode(true));
  }

Demo: https://stackblitz.com/edit/polymer-3-template-byge9j?file=index.js,custom-element.js

polymerpolymer-2.xpolymer-3.x


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