[рони]

dima85,

<style type="text/css">

.email-address:before {
  content: "Email address: ";
}

  </style>

  <script>
    var rules  =  document.styleSheets[0].cssRules[0];  // for  styleSheets   for  cssRules
   if(rules.selectorText == ".email-address::before") alert(rules.style["content"]);
  </script>