<https://w3schools.invisionzone.com/topic/53171-problem-with-blur/#comment-293032>
<http://schema.org/text>
"They're doing it the same way that you're trying to do it, just with a few more tricks to try and get around the popup blocker. It doesn't work any better than anything else, my browser still blocks that popup.If you want to do it then you open the window and then blur it. Just be aware that the vast majority of browsers are going to block you from doing that because it's annoying. "
<https://w3schools.invisionzone.com/topic/53171-problem-with-blur/?tab=comments#comment-293006>