JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://unpkg.com/webcompose@latest/dist/webcompose.min.js"></script>
<hello-world></hello-world>

JavaScript

const { ComposableElement, html } = window.webcompose

class HelloWorld extends ComposableElement {
  static render(){
    return html`
      Hello World
    `
  }
}

customElements.define("hello-world", HelloWorld);