Preserve focus across node replacements

packages/html2/src/index.ts

@@ -57,7 +57,13 @@ export class Widget implements EventTarget {
                     }
                 }
 
+                const wasFocus = oldNode && document.activeElement === oldNode;
                 oldNode?.parentNode?.replaceChild(newNode, oldNode);
+                if (wasFocus) {
+                    if (newNode && newNode instanceof HTMLElement) {
+                        newNode.focus();
+                    }
+                }
 
                 this.node.value = newNode;
             }