title: ie browser iframe has src source but body and head is empty
body: <p>the problem is when use IE browser, find the iframe has src source but body and head is empty, while copy this src can open at new ie page, thanks for answer!</p>
  <p><a href="https://i.stack.imgur.com/rCcKP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rCcKP.png" alt="enter image description here" /></a></p>