Bootstrap 4 invalid feedback with input group not displaying

Question

I have been looking into Bootstrap 4 - beta, however when using .is-invalid with .input-group it doesn\'t seem to show up.

Answer 1

here is my "diy" answer

html

    

        End Date/Time
        

            

                
Start Date
            
            
            

                Error Message
            
            

                

            
        
    

css

.error-feedback{
    border:1px red solid;
}

I know there is a bit off but, IMO pretty good compared this example