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chromium/third_party/blink/web_tests/external/wpt/html/rendering/non-replaced-elements/the-page/iframe-scrolling-attribute.html 

<!DOCTYPE html>
<title>iframe: changing the scrolling attribute</title>
<link rel="author" href="mailto:[email protected]">
<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-page">
<link rel="match" href="iframe-scrolling-attribute-ref.html">

<style>
    iframe {
        width: 100px;
        height: 100px;
    }
</style>

<p>These two iframes should *both* render with scrollbars:</p>
<iframe src="support/big-page.html" scrolling="unknown"></iframe>
<iframe src="support/big-page.html" scrolling="unknown"></iframe>

<script>
  var iframe = document.getElementsByTagName("iframe")[1];
  // Setting scrolling=no and then back to scrolling=unknown
  // should result in a final value of auto.
  iframe.setAttribute("scrolling", "no");
  iframe.setAttribute("scrolling", "unknown");
</script>