--- /dev/null
+import { LitElement, html, css } from './node_modules/lit-element/lit-element.js';
+
+class HelloWorld extends LitElement {
+ render() {
+ return html`<p>Hello world! Came here from ${document.referrer || 'unset-referrer' }</p>`;
+ }
+}
+
+customElements.define('hello-world', HelloWorld);