XSLTProcessor: метод transformToFragment()

transformToFragment(source, document)

<div id="result"></div>

const xmlString = `
<books>
  <book>
    <title>Book 1</title>
    <author>Author 1</author>
  </book>
  <book>
    <title>Book 2</title>
    <author>Author 2</author>
  </book>
</books>
`;

const xsltString = `
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="html"/>
  <xsl:template match="/">
    <ul>
      <xsl:for-each select="books/book">
        <li>
          <strong><xsl:value-of select="title"/></strong>
          by <em><xsl:value-of select="author"/></em>
        </li>
      </xsl:for-each>
    </ul>
  </xsl:template>
</xsl:stylesheet>
`;

const parser = new DOMParser();
const xmlDoc = parser.parseFromString(xmlString, "application/xml");
const xsltDoc = parser.parseFromString(xsltString, "application/xml");

const xsltProcessor = new XSLTProcessor();
xsltProcessor.importStylesheet(xsltDoc);

// Perform the transformation, returning the result as a document fragment
const resultFragment = xsltProcessor.transformToFragment(xmlDoc, document);

// Insert the result into the page
document.getElementById("result").appendChild(resultFragment);