Come on. With XSLT you write a rule and then write a fragment of the resulting document.

    <xsl:template match="abc">
      <def ghi="jkl"/>
    </xsl:template>

This is one of simplest ways to do things. With JavaScript you what? Call methods?

    CreateElement("def").setAttribute("def", "jkl")

There is a ton of "template engines" (all strictly worse than XSLT); why people keep writing them? Why people invented JSX with all the complicated machinery if plain JavaScript is better?