CSS select the first child from elements with particular attribute

Question

Lets say that we have the following code:

  
  
  &l         


        

Answer 1

:not([bla="3"]) + [bla="3"] {
  color: red;
}

  
EL1
  
EL2
  
EL3
  
EL3
  
EL3
  
EL4