Modify pseudo-element :after's width using javascript [duplicate]

Answer 1

With just a simple trick any pseudo-element can be changed (or at least replaced with something else):

$('.something').click(function(){
  $(this).toggleClass('to_show');
});

.something
{
  background: red;
  height: 40px;
  width: 120px;
  position: relative;
}
.something.to_show:after
{
  content: "X";
  color: white;
  background: green;
  width: 20px;
  height: 20px;
  position: absolute;
  right: 0px;
  top: 0px;
  display: block;
  text-align: center;
}
.something:after
{
  content: "O";
  color: white;
  background: blue;
  width: 30px;
  height: 25px;
  position: absolute;
  right: 0px;
  top: 0px;
  display: block;
  text-align: center;
}

  
    

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