var selection  = window.getSelection(),
         element1 = this.canvas.getDocumentElement(selection.anchorNode),
         element2 = this.canvas.getDocumentElement(selection.focusNode),
     var selection  = window.getSelection(),
         element1 = this.canvas.getDocumentElement(selection.anchorNode),
         element2 = this.canvas.getDocumentElement(selection.focusNode),