open-wc/packages/building-webpack/demo/js/lazy-component.js

import { LitElement, html, css } from 'lit-element';

class LazyComponent extends LitElement {
  static get styles() {
    return css`
      p {
        color: red;
      }
    `;
  }

  render() {
    return html` <p>Lazy component</p> `;
  }
}

customElements.define('lazy-component', LazyComponent);