<!doctype HTML>
<html>
<meta charset="utf8">
<title>Content Visibility: hidden iframe (reference)</title>
<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">

<style>
div {
  background: blue;
}
</style>

<div>lorem ipsum</div>
<iframe width=400 height=200 srcdoc='
  <style>
  div {
    background: lightgreen;
  }
  </style>
  <div>dolor sit amet</div>
'></iframe>
<div>consectetur adipiscing elit</div>