如何使用Javascript删除最外层的XML元素标记对？

const xmlString = "<root><element>Content</element></root>";
const parser = new DOMParser();
const xmlDoc = parser.parseFromString(xmlString, "text/xml");

const rootElement = xmlDoc.documentElement;
const outerElement = rootElement.firstChild;

while (outerElement.firstChild) {
  rootElement.appendChild(outerElement.firstChild);
}
rootElement.removeChild(outerElement);

const serializer = new XMLSerializer();
const modifiedXmlString = serializer.serializeToString(xmlDoc);

const xmlString = "<root><element>Content</element></root>";
const parser = new DOMParser();
const xmlDoc = parser.parseFromString(xmlString, "text/xml");

const rootElement = xmlDoc.documentElement;
const outerElement = rootElement.firstChild;

while (outerElement.firstChild) {
  rootElement.appendChild(outerElement.firstChild);
}
rootElement.removeChild(outerElement);

const serializer = new XMLSerializer();
const modifiedXmlString = serializer.serializeToString(xmlDoc);

console.log(modifiedXmlString);

<element>Content</element>