code: function () {
        let encoded = this.responseText;
  
        // We sometimes want markup code to be in an HTML-like template language with tags delimited by stashes.
        // In order for js-beautify to indent such code correctly, any space between control characters #, ^, and /, and
        // the variable name must be removed. However, we want to add the spaces back later.
        // \u00A0 is &nbsp; a space character not enterable by keyboard, and therefore a good delimiter.
        encoded = encoded.replace(/(\{\{#)(\s+)(\S+)/g, '$1$3$2\u00A0');
        encoded = encoded.replace(/(\{\{\^)(\s+)(\S+)/g, '$1$3$2\u00A0');
        encoded = encoded.replace(/(\{\{\/)(\s+)(\S+)/g, '$1$3$2\u00A0');
  
        encoded = window.html_beautify(encoded, {
          indent_handlebars: true,
          indent_size: 2,
          wrap_line_length: 0
        });
  
        // Add back removed spaces to retain the look intended by the author.
        encoded = encoded.replace(/(\{\{#)(\S+)(\s+)\u00A0/g, '$1$3$2');
        encoded = encoded.replace(/(\{\{\^)(\S+)(\s+)\u00A0/g, '$1$3$2');
        encoded = encoded.replace(/(\{\{\/)(\S+)(\s+)\u00A0/g, '$1$3$2');
  
        // Delete empty lines.
        encoded = encoded.replace(/^\s*$\n/gm, '');
  
        // Encode with HTML entities.
        encoded = window.he.encode(encoded);
  
        codeViewer.encoded = encoded;
  
        if (codeViewer.tabActive === 'e') {
          codeViewer.activateDefaultTab('e', encoded);
        }
      }
docs: This runs once the AJAX request for the encoded markup is finished.
  If the encoded tab is the current active tab, it adds the content to the default code container