title: Script tag loading inside Iframes
body: <p>I've been trying to find an answer to this but could never find one:</p>
  
  <p>I have four iframes loading on a parent page. Each of these I frames have javascript to be executed (slightly different JS in each one).</p>
  
  <p>Currently, I've bundled all that JS into one file, which is in  tag in each of the frames.</p>
  
  <p>The behaviour I see is that the browser emits only one request to that script, since it's the same in each frame.</p>
  
  <p>My question is: What if I wanted smaller bundles, by splitting that JS file into 4 smaller ones. how are script tags loaded inside an iframe ? </p>
  
  <p>If they're loaded async: I might gain some performance from it. 
  If they're loaded one after the other: Then having a larger bundle and avoiding multiple round trips might be better.</p>