pesudo element getComputedStyle return undefined

[sobhan konari]

hi guys
why this code return undefined for me?

  var span = document.querySelector('span'); 
  var result = window.getComputedStyle(span,':after').getPropertyValue('position');

document.write(result);

span{
        margin:0 auto;
        font-size:40px;
        display: inline-block;
        position: relative;
    }
span:after{
    position: absolute;
  content: "";
  border:1px solid #f30;
  left:0;
  top:55px;
  width:45px;
}

[Shikkediel]

Working fine?

codepen.io/JpbJRE

[Shikkediel]

Only cause I can think of without seeing a demo is that you’ve put the code in the head section without a document ready wrapping function. Which means the script is executed before the page has been read (and the element “exists”).

[Author]

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