pseudo-element test

by cm0s

HTML

<div id="example">a</div>

CSS

#example {
    border: 1px solid black;
}
#example:before {
   content: "";
   display: block;
   width: 100px;
   height: 100px;
    border: 1px solid black;
}
#example:after {
   content: "";
   display: block;
   width: 100px;
   height: 100px;
    border: 1px solid black;
}