Update the style of selected component

I'm trying to update the css of selected element. Example: Selected element: <div id="inul" class='class1'>Hello</div> the above code was returned from component.toHTML(); CSS: .class1{ background-color: black; } the above css code was returned from editor.CodeManager.getCode(component, 'css', {cssc: editor.CssComposer}); I used textarea here(for example) and edit the css code and when I hit save button and run the code below editor.getSelected().em.set('style', content); The result is not what it should be it returns #inul { 0: .; 1: w; 2: o; 3: o; 4: m; 5: d; 6: a; 7: 1; 8: 9; 9: 4; 10: 5;...