Good point to make a commit

tp-rtb-clear-format.js

@@ -0,0 +1,16 @@
+import { TpRtbBaseExtension } from './tp-rtb-base-extension.js';
+
+class TpRtbClearFormat extends TpRtbBaseExtension {
+  constructor() {
+    super();
+    this.label = 'Clear Format';
+  }
+
+  _handleClick() {
+    if (this.parentEditor && this.parentEditor.editor) {
+      this.parentEditor.editor.chain().focus().unsetAllMarks().run();
+    }
+  }
+}
+
+customElements.define('tp-rtb-clear-format', TpRtbClearFormat);