Mobile-friendly external site pop-up window

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Javascript

HTML

popup

I am trying to create a mobile-friendly pop-up that allows people to click on a link in a Qualtrics survey that opens a new window that takes them to an external site. Once they are on the external site, they are able to return to the original site. What would be the best way to achieve this? I've looked into modal iFrames and those are problematic because there are some external sites that I want to feature in pop-up windows that do not allow themselves to be embedded into iFrames. I'm hoping that I can add some sort of banner that allows a user to close the pop-up window to take them back to the original site.

What I have tried:

<pre><script>
function popup() {
    var win = window.open("https://www.npr.org/2020/09/08/910707527/tech-stocks-are-in-a-mood-and-theyre-dragging-the-market-down-with-them", "Page Title", "toolbar=no, location=no");
    var win_timer = setInterval(function() {   
      if(win.closed) {
          jQuery("#NextButton").click();
          clearInterval(win_timer);
      } 
      }, 100); 
}
</script>
<a href="javascript:void(0)" onclick="popup()">Open Me</a>