Is SweetAlert2 html parameter length limited in size?

Question

I recently created a plugin for Joomla which uses the nice SweetAlert2 popup script and it generally works fine. However, surprisingly, when the size of the html message I use is too long, the box does not popup and the content gets instead written to the document body itself. Is there a size limit for the html parameter or could this somehow be caused by Joomla?

• No, I did not yet isolate how many characters it fails but I will.

• No, I did not dig into SweetAlert2's code as it goes way beyond what I can do with javascript.

• Yes, I checked the miniorange plugin but it was not really what I needed.

• Here's the code for the part where I check the html parameter (note that I had to try to deal with accented characters too).

  /**
   *
   * Create content 
   * 
   * Parameters-values separators is :=
   */
  function generateText($array)
  {
      $res =explode(",",$array);
  
      // For each parameter
      // we extract value
      foreach ($res as  $str)
      {
          $s = explode(":=", $str);
          // Test apostrophe
          if ($s[0] == 'html' || $s[0] == 'text')
          {
              //$s[1] = trim($s[1],"'");
  
              if (strpos($s[1],"l'") !== false)
              {
                  $accents = str_replace("l'","l\'",$s[1]);
                  $string = "'" . $accents . "'";
              }
              else
                  $string = $s[1];
          }
          else
              $string = $s[1];
  
          // In case there's html, decode to keep tags
          $corr = html_entity_decode($string);
          // Add to final text
          $texte .= $s[0] . ":  " . $corr .",";
      }
      // Remove last two chars
      $new = substr($texte, 0, -1);
  
      return $new;
  }
  

:= is the separator and the plugin syntax is like:

{swal title:='<span style="font-size: 16px;">INFORMATION</span>',html:='<span style="font-size: 14px;">Mask and sanitary pass are</span><b><span style="font-size: 14px; color: #FF0000;"> mandatory for all adults and kids from 12 to 17 to....</span></b><br /><br /><b>Thanks!</b>',icon:='info',confirmButtonText:='OK',iconColor:='#FF0000'}{/swal}