code: function (html, callback) {
          var self = this, body = this.getEl().contentWindow.document.body;
  
          // Wait for iframe to initialize IE 10 takes time
          if (!body) {
            Delay.setTimeout(function () {
              self.html(html);
            });
          } else {
            body.innerHTML = html;
  
            if (callback) {
              callback();
            }
          }
  
          return this;
        }
docs: Inner HTML for the iframe.
  
  @method html
  @param {String} html HTML string to set as HTML inside the iframe.
  @param {function} callback Optional callback to execute when the iframe body is filled with contents.
  @return {tinymce.ui.Iframe} Current iframe control.