Javascript optgroup hiden dont working IExlorer : This code working in Opera, problem is IE end Android. 
Use hiden() javascript. First Option use value Mazda (mark) second shows us 'opera': only all models MAZDA (is good). 'IE': Shows us all model and all optgroup. Maybe is in JS problem?

    $(document).ready(function() {
      $('#model optgroup').hide();enter code here
      $('#Marka').change(function() {
        var text = $(this).val();
        $('#model optgroup').hide();
        $('#model').val('');
        $('#model optgroup[label="' + text + '"]').css({
          'display': 'block'
        });
    
    
      });
    });
    
    function usun() {
      document.getElementById("first").style.display = "none";
    
    }

[https://jsfiddle.net/p051m5u6/][1]


  [1]: https://jsfiddle.net/p051m5u6/