html - Modify CSS selector :after with JavaScript -

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how access or modify pseudo-selectors :after , :hover of css of element through javascript (please no jquery).

example

<!doctype html> <html>     <head>         <meta http-equiv="content-type" content="text/html; charset=utf-8" />         <title>progress bar example</title>         <style type="text/css">         .progressbar         {             position: relative;             width: 100px;             height: 10px;             background-color: red;         }          .progressbar:after         {             content: "";             position: absolute;             width: 25%;             height: 100%;             background-color: blue;         }         </style>     </head>      <body>         <div id="progressbar" class="progressbar" onclick="this.style.width='90%';"></div>     </body> </html>

like see want use somethink progress bar, can't exchange/add/remove second class element. access the width property of progressbar:after (with :after selector) class directly through js. how?

you give try:

edited

//create new style element var style = document.createelement("style");  //append style document.head.appendchild(style);  //take stylesheet object sheet = style.sheet  //add rule stylesheet -- changed line .insertrule sheet.insertrule('.progressbar::after { width: 50% }', 0);

updated fiddle


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