JSFiddle - React, Tailwind, and code Playground

HTML

<input type="submit" value="Print All"
  onclick="javascript:printall()"
/>
<p>Hi! I'm a report!</p>
<iframe id="frame1" src="http://indiabix.com"></iframe>
<iframe id="frame2" src="http://indiabix.com"></iframe>
<iframe id="frame1" src="http://indiabix.com"></iframe>
<iframe id="frame2" src="http://indiabix.com"></iframe>

JavaScript

function printall() {
  window.print();
  for (var i=0; i<window.frames.length; i++) {
    alert('Click here AFTER you have sent document ' + (i+1) + ' to the printer.');
    window.frames[i].focus();
    window.frames[i].print();
  }
}