chromium/content/test/data/workers/many_workers.html

<html>
<script>
var url = document.location.toString();
var num_workers = parseInt(url.substr(url.search("count=") + 6));

for (var i = 0; i < num_workers; ++i)
  var worker = new Worker("worker_common.js");
</script>

<body>
</body>
</html>