Implement normalize function

src/dom/node.ts

@@ -301,6 +301,32 @@ export class Node extends EventTarget {
  oldChild._replaceWith(newChild);
  return oldChild;
  }
+ normalize() {
+ let i = 0;
+ while (i < this.childNodes.length) {
+ const currentNode = this.childNodes[i];
+ if (currentNode.nodeType === NodeType.TEXT_NODE) {
+ let nextNode = this.childNodes[i + 1];
+
+ // Merge adjacent text nodes
+ while (nextNode && nextNode.nodeType === NodeType.TEXT_NODE) {
+ if (currentNode.nodeValue) {
+ currentNode.nodeValue += nextNode.nodeValue;
+ }
+ this.removeChild(nextNode);
+ nextNode = this.childNodes[i + 1];
+ }
+ if (currentNode.nodeValue === "") {
+ this.removeChild(currentNode);
+ } else {
+ i++;
+ }
+ } else {
+ currentNode.normalize();
+ i++;
+ }
+ }
+ }
 
  insertBefore(newNode: Node, refNode: Node | null): Node {
  this._assertNotAncestor(newNode);