How to make such a mixin?

Question

Preprocessors

Here are the outlines:

@mixin placeholder($text){   /*Сюда должно считыватся значение из placeholder*/
  ::placeholder:{
    ::focus{
      opacity: 0;			/*При фокусе значение должно изчезать*/
    }
  }
}

Please help, I don't know how to do this. thanks in advance!

Answer 1

@mixin placeholder(){
  &::placeholder {
    color: #ccc;
  }
  &::placeholder:focus {
    opacity: 0;
  }
}

input {
  @include placeholder();
}