Good point to make a commit

demo/src/the-app.js

@@ -0,0 +1,54 @@
+/**
+@license
+Copyright (c) 2025 trading_peter
+This program is available under Apache License Version 2.0
+*/
+
+import '../../tp-rich-text-box.js';
+import '../../tp-rtb-bold.js';
+import '../../tp-rtb-italic.js';
+import '../../tp-rtb-strike.js';
+import '../../tp-rtb-underline.js';
+import '../../tp-rtb-code.js';
+import '../../tp-rtb-clear-format.js';
+import { LitElement, html, css } from 'lit';
+
+class TheApp extends LitElement {
+  static get styles() {
+    return [
+      css`
+        :host {
+          display: flex;
+          flex-direction: column;
+          position: absolute;
+          inset: 0;
+          font-family: sans-serif;
+        }
+      `
+    ];
+  }
+
+  render() {
+    return html`
+      <tp-rich-text-box>
+        <tp-rtb-bold></tp-rtb-bold>
+        <tp-rtb-italic></tp-rtb-italic>
+        <tp-rtb-strike></tp-rtb-strike>
+        <tp-rtb-underline></tp-rtb-underline>
+        <tp-rtb-code></tp-rtb-code>
+        <tp-rtb-clear-format></tp-rtb-clear-format>
+      </tp-rich-text-box>
+    `;
+  }
+
+  static get properties() {
+    return {
+    };
+  }
+
+  constructor() {
+    super();
+  }
+}
+
+window.customElements.define('the-app', TheApp);