docs: function (html) {
          const editor = this.editor
          const range = editor.selection.getRange()
  
          if (this.queryCommandSupported('insertHTML')) {
              // W3C
              this._execCommand('insertHTML', html)
          } else if (range.insertNode) {
              // IE
              range.deleteContents()
              range.insertNode($(html)[0])
          } else if (range.pasteHTML) {
              // IE <= 10
              range.pasteHTML(html)
          } 
      }