Untitled

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <style>
      #foo {
        color: green;
      }
    </style>
  </head>
  <body>
    <h1 id="foo">Lorem ipsum</h1>
     <script>
      console.log(document.getElementById("foo").style.color);
    </script>
  </body>
</html>