What are the rules of inheritance in the mix?

.container-fixed(@gutter:30px) {
  margin-right: auto;
  margin-left: auto;
  padding-left:  floor((@gutter / 2));
  padding-right: ceil((@gutter / 2));
   &:extend(.clearfix all);
}


.clearfix{
  &:before,
  &:after {
    content: " "; 
    display: table; 
  }
  &:after {
    clear: both;
  }
}

.container{
    .container-fixed()
}

compilation results

.clearfix:before,
.clearfix:after,
.container:before,
.container:after {
  content: " ";
  display: table;
}
.clearfix:after,
.container:after {
  clear: both;
}
.container {
  margin-right: auto;
  margin-left: auto;
  padding-left: 15px;
  padding-right: 15px;
}

it is obvious that the mixture of container-fixed inherits .clearfix, and the compilation result is container inheritance. You can"t understand it and ask for instructions

Less

Sep.30,2021

treat .container-fixed as a placeholder

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