convert html to pdf with Html2Pdf

What I want is to print a pdf file with the text that I have in Ckeditor I get it and I send it with ajax using the following function

 $('#botontexto').on('click', function() {     
    var texto =  CKEDITOR.instances['editor1'].getData(); 
    $.ajax({
        type: 'POST',
        data: {"texto": texto},
        url:"php/imprimir_informe.php",
        success: function(response){
        },
        complete: function(){
            window.open('php/imprimir_informe.php');
        }
    })   
});

and the php that receives the information is the following:

<?php
require '../vendor/autoload.php';
use Spipu\Html2Pdf\Html2Pdf;
$html = $_POST['texto'];
$html2pdf = new Html2pdf();
$html2pdf->writeHTML($html);
$html2pdf->output('prueba223.pdf','D');
?>

The problem is that it generates the blank PDF file