<!doctype html>
<html>
<meta charset="utf-8">
<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
<style>
#target {
  width: 50px;
  height: 50px;
  background-color: green;
  opacity: 0.4;
}
</style>
<body>
  <div id="target"></div>
</body>
</html>