Chrome print is blocking even though it is not in the same window or tab

blockjs-in-chrome.js

<script>
function sleep(milliseconds) {
  var start = new Date().getTime();
  for (var i = 0; i < 1e7; i++) {
    if ((new Date().getTime() - start) > milliseconds){
      break;
    }
  }
}

var winPrint = window.open('', '', 'left=0,top=0,width=800,height=600,toolbar=0,scrollbars=0,status=0');
winPrint.document.write('<title>Print Report</title><br /><br /> Hello World');
winPrint.document.close();
winPrint.focus();
winPrint.print();
winPrint.close(); 

//you wont see this executed because the javascript print is blocking
while (true) {
  console.log('still running js in background');
  sleep(5000);
}
 </script>